Loading...
HomeMy WebLinkAbout20240220-Graves-Gosnold Street - Appendix F - Stormwater ReportSTORMWATER REPORT GOSNOLD STREET IMPROVEMENTS Department of Public Works Town of Barnstable MA January, 2024 STORMWATER REPORT Date: January 17, 2024 To Town of Barnstable Conservation Commission From Lauren Howe-Januzzi, EIT, Environmental Partners Ryan Paul, PE, Environmental Partners CC Jamie Veillette, EIT, Environmental Partners Steven Ignatowich, PE, Environmental Partners Subject Stormwater Management Report Gosnold Street Improvements Town of Barnstable, Massachusetts On behalf of the Town of Barnstable Department of Public Works (the Town), Environmental Partners (EP) has prepared the following stormwater management report in support of design, and local and state permitting efforts for the redevelopment of Gosnold Street in Barnstable, Massachusetts. This report has been prepared in accordance with the requirements of Massachusetts Wetland Regulations – 310 CMR 10.00, Massachusetts Stormwater Management Standards, and the Town of Barnstable Wetlands Protection Ordinance. Project Description The purpose of the Project is to provide improvements to existing pavement, curbing, sidewalk, and utility castings along Gosnold Street in Hyannis. Only minor modifications will be made to the drainage system, such as moving catch-basins to low points, and change in types from grates to covers. No modifications were made to the drainage trunklines or structures. Project Background Gosnold Street in Hyannis travels in an east-west direction from Sea Street to Ocean Street, a distance of approximately 3,000 linear feet. The roadway is approximately 24 feet wide on average and is publicly owned. The existing roadway pavement is in poor condition and is in need of resurfacing. There is sidewalk and curbing located along the southern side of Gosnold Street that is in poor Page 2 of 6 envpartners.com condition and is in need of reconstruction and replacement. In addition, there are several isolated ponding areas along the roadway that must be addressed via grading changes or new catch basins. Proposed Improvements The proposed improvements will include milling and pavement overlay with a similar alignment as the existing conditions and reconstructing the existing sidewalk and pedestrian curb ramps to be ADA compliant within the project limits. New sidewalk is proposed only where it currently exists. In addition, there will only be minor proposed grading to the roadway. The Design Plans are provided in Attachment 1 and a locus map is provided below in Figure 1 EP has considered this project a redevelopment project according to the MassDEP Stormwater Standards. The project will result in a reduction in impervious area by approximately 2,200-sf between existing and proposed conditions. Figure 1 – Gosnold Street Locus Map Hydrologic Model Setup EP used HydroCAD Version 10.20 to model the hydrologic conditions of Gosnold St and its watershed. The drainage area maps included in Attachment 4 show the watershed delineation for existing and proposed conditions. HydroCAD Reports for existing and proposed conditions for the 2- , 10-, and 100-year 24-hour storm events are provided in Attachments 5 and 6. Page 3 of 6 envpartners.com Model Information EP gathered data from the following sources for input into the stormwater model:  Drainage System – Topographic and utility information were gathered from ground survey investigations and Town DPW information.  Elevations – Digital elevation model (DEM) data were downloaded from the MassGIS website at https://maps.massgis.digital.mass.gov/MassMapper/MassMapper.html. The DEM file was used for sub-catchment delineation within the catchment (study) area.  Soils – Soil information (For CN Values) was gathered from the United States Geological Survey (USGS) Web Soil Survey (WSS) website https://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm. The WSS provides soil data for stormwater analysis, such as soil types, hydraulic soil groups (HSG), and estimated infiltration rates.  Land Use (for CN Values) area was developed from shape files downloaded from the MassGIS website at https://maps.massgis.digital.mass.gov/MassMapper/MassMapper.html. The areas were confirmed by using aerial views from ortho imagery.  Rainfall Events – Data for the 2-yr, 10-yr, and 100-yr 24-hr rainfall events were gathered from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14, Volume 10, Version 3 website. Type III Soil Conservation Services (SCS) unit hydrograph was selected to develop the rainfall distribution. Model Setup EP developed a curve number (CN) and time of concentration (Tc) for each sub-catchment using land use and soils information. The model is broken into eight sub-catchments (SC-1 through SC-8) based on catchment delineations for each analysis point. EP placed eight analysis points (AP-1 through AP- 8) in the model based on the location of catch basin inlets along Gosnold St. EP made the following assumptions during the creation of the model:  Modeling was used to calculate peak flows from each sub -catchment only. EP did not model pipes and conduits because significant alterations are not proposed as part of the roadway design. This analysis will give a good indication of existing vs. proposed peak flow conditions. However, flooding conditions were not assessed.  Time of concentration (Tc) for each sub-catchment was based on the longest time flow path to each analysis point within each sub-catchment. Standards for Stormwater Report Redevelopment Project As demonstrated below, the Project meets or meets to the maximum extent practicable the MassDEP Stormwater Standards for a redevelopment project under the Massachusetts Wetlands Protection Act and the Town of Barnstable Ordinances. The Massachusetts Stormwater Checklist is included in Attachment 2. The Checklist has been stamped and signed by a Registered Professional Engineer in the State of Massachusetts. Stormwater Standard 1: No Untreated Discharges or Erosion to Wetlands No New Untreated Discharges Page 4 of 6 envpartners.com There are no new untreated discharges proposed to the existing outfalls. Erosion to Wetlands from Discharges Peak flows are identical or are reduced in all scenarios. Therefore, the velocities at the outfalls will not exceed the existing velocity under proposed conditions. In addition, no changes to the effects of scour will be made. EP believes that the project has been designed to comply with Standard 1 based on our assessment. Stormwater Standard 2: Peak Rate Attenuation The Project is reducing the amount of impervious surface area and therefore is not significantly altering hydrologic conditions of the existing land cover. As a result, the post-development peak discharge rates do not exceed the pre-development peak discharge rates for the 2-, 10-, and 100- year storm events as shown in Table 1. Therefore, the Project is in meets Standard 2. Table 1 – Peak Discharge Rates Analysis Point 2-yr 24-hr Storm Peak Discharge Rates (cfs) 10yr 24-hr Storm Peak Discharge Rates (cfs) 100-yr 24-hr Storm Peak Discharge Rates (cfs) Exist. Prop. Diff. Exist. Prop. Diff. Exist. Prop. Diff. 1 0.45 0.45 0.00 1.5 1.5 0.00 3.61 3.61 0.00 2 0.31 0.31 0.00 0.68 0.68 0.00 1.33 1.33 0.00 3 0.18 0.18 0.00 0.76 0.76 0.00 2.11 2.11 0.00 4 0.28 0.28 0.00 0.88 0.88 0.00 2.12 2.12 0.00 5 0.37 0.37 0.00 1.54 1.52 -0.02 4.24 4.19 -0.05 6 0.77 0.77 0.00 2.15 2.15 0.00 4.86 4.86 0.00 7 0.48 0.48 0.00 1.56 1.56 0.00 3.81 3.81 0.00 8 1.24 1.24 0.00 3.65 3.65 0.00 8.54 8.54 0.00 Stormwater Standard 3: Stormwater Recharge The project will result in a net reduction in paved and impervious surface area. Therefore, no additional infiltration is required. As a result, the Project complies with Standard 3. See Table 2 below for impervious surface calculations. Table 2 – Existing vs. Proposed Impervious Area Existing Impervious Area Proposed Impervious Area 3.23-acres 3.17-acres Stormwater Standard 4: Water Quality The proposed stormwater management system currently incorporates continued street sweeping to remove accumulated solids. No modifications to the drainage system or outfalls are proposed at Page 5 of 6 envpartners.com this time. A MassDEP TSS Removal worksheet is included in Attachment 7. The project has been designed to meet the requirements of Standard 4 to the maximum extent practicable as a limited project based on the scope of the paving and sidewalk project. Stormwater Standard 5: Land Use with Higher Potential Pollutant Loads The project site is comprised mostly of residential and forested areas. These land use categories are not considered to be Land Uses with Higher Potential Pollutant Loads (LUHPPL). Additionally, no new stormwater discharges from the site are proposed; therefore Standard 5 is not applicable. Stormwater Standard 6: Critical Areas The project site discharges via municipal storm drains to marshes and swamps located North and South of Gosnold St. These are not Outstanding Water Resources, and are not within the Zone II or interim Wellhead Protection Area of a public water supply; therefore, Standard 6 is not applicable. Stormwater Standard 7: Redevelopment The project is the reconfiguration of an existing roadway and does not proposed additional impervious area. Therefore, it is a redevelopment project. The project proposes to utilize existing stormwater management infrastructure with minimal improvements to the existing systems. In general, the project has been designed to comply with Standard 4 to the maximum extent practicable as discussed throughout this Section. Standards 1, 2, 3, 9, and 10 have been fully met. Standards 5 and 6 are not applicable. Standard 8 will be met before the start of construction. Overall, measures have been proposed to improve existing conditions. Stormwater Standard 8: Construction Period Controls The Design Plans in Attachment 1 provide a construction period control plan for the project. T he Project will disturb more than one acre of land and therefore, an EPA NPDES Construction General Permit (CGP) will be obtained before the start of construction. A Stormwater Pollution Prevention Plan (SWPPP) will be provided by a future Contractor to me et the requirements of the MassDEP Stormwater Handbook Standard 8 and EPA PDES CGP, and will be obtained before construction commences. Stormwater Standard 9: Operation and Maintenance Plan The Town of Marshfield will continue to be responsible for the operation and maintenance of the stormwater systems post-construction. Per NPDES permit (#MAR 041090), the Town currently provides preventative O&M procedures that are optimized for effective maintenance of the stormwater system. The project has been designed to comply with Standard 9. Stormwater Standard 10: Illicit Discharges to Drainage System A signed Illicit Discharge Statement is provided in Attachment 7. The project has been designed to comply with Standard 10. Attachments: 1. Permitting Design Plans (Half Size Set) 2. MassDEP Stormwater Checklist 3. H-H Model Backup Information Page 6 of 6 envpartners.com  NRCS Soils Report  NOAA Atlas 14, Volume 10 Version 3 for Barnstable, MA (Precipitation Frequency Data) 4. Existing and Proposed Drainage Area Maps 5. Existing Model Report 6. Proposed Model Report 7. MassDEP TSS Removal Worksheet 8. Illicit Discharge Compliance Statement ATTACHMENT 1 PERMITTING DESIGN PLANS (HALF-SIZE SET) ATTACHMENT 2 MASSDEP STORMWATER CHECKLIST 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 3 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) LID Measures: Stormwater Standards require LID measures to be considered. Document what environmentally sensitive design and LID Techniques were considered during the planning and design of the project: No disturbance to any Wetland Resource Areas Site Design Practices (e.g. clustered development, reduced frontage setbacks) Reduced Impervious Area (Redevelopment Only) Minimizing disturbance to existing trees and shrubs LID Site Design Credit Requested: Credit 1 Credit 2 Credit 3 Use of “country drainage” versus curb and gutter conveyance and pipe Bioretention Cells (includes Rain Gardens) Constructed Stormwater Wetlands (includes Gravel Wetlands designs) Treebox Filter Water Quality Swale Grass Channel Green Roof Other (describe): Standard 1: No New Untreated Discharges No new untreated discharges Outlets have been designed so there is no erosion or scour to wetlands and waters of the Commonwealth Supporting calculations specified in Volume 3 of the Massachusetts Stormwater Handbook included. 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 4 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 2: Peak Rate Attenuation Standard 2 waiver requested because the project is located in land subject to coastal storm flowage and stormwater discharge is to a wetland subject to coastal flooding. Evaluation provided to determine whether off-site flooding increases during the 100-year 24-hour storm. Calculations provided to show that post-development peak discharge rates do not exceed pre- development rates for the 2-year and 10-year 24-hour storms. If evaluation shows that off-site flooding increases during the 100-year 24-hour storm, calculations are also provided to show that post-development peak discharge rates do not exceed pre-development rates for the 100-year 24- hour storm. Standard 3: Recharge Soil Analysis provided. Required Recharge Volume calculation provided. Required Recharge volume reduced through use of the LID site Design Credits. Sizing the infiltration, BMPs is based on the following method: Check the method used. Static Simple Dynamic Dynamic Field1 Runoff from all impervious areas at the site discharging to the infiltration BMP. Runoff from all impervious areas at the site is not discharging to the infiltration BMP and calculations are provided showing that the drainage area contributing runoff to the infiltration BMPs is sufficient to generate the required recharge volume. Recharge BMPs have been sized to infiltrate the Required Recharge Volume. Recharge BMPs have been sized to infiltrate the Required Recharge Volume only to the maximum extent practicable for the following reason: Site is comprised solely of C and D soils and/or bedrock at the land surface M.G.L. c. 21E sites pursuant to 310 CMR 40.0000 Solid Waste Landfill pursuant to 310 CMR 19.000 Project is otherwise subject to Stormwater Management Standards only to the maximum extent practicable. Calculations showing that the infiltration BMPs will drain in 72 hours are provided. Property includes a M.G.L. c. 21E site or a solid waste landfill and a mounding analysis is included. 1 80% TSS removal is required prior to discharge to infiltration BMP if Dynamic Field method is used. 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 5 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 3: Recharge (continued) The infiltration BMP is used to attenuate peak flows during storms greater than or equal to the 10- year 24-hour storm and separation to seasonal high groundwater is less than 4 feet and a mounding analysis is provided. Documentation is provided showing that infiltration BMPs do not adversely impact nearby wetland resource areas. Standard 4: Water Quality The Long-Term Pollution Prevention Plan typically includes the following:  Good housekeeping practices;  Provisions for storing materials and waste products inside or under cover;  Vehicle washing controls;  Requirements for routine inspections and maintenance of stormwater BMPs;  Spill prevention and response plans;  Provisions for maintenance of lawns, gardens, and other landscaped areas;  Requirements for storage and use of fertilizers, herbicides, and pesticides;  Pet waste management provisions;  Provisions for operation and management of septic systems;  Provisions for solid waste management;  Snow disposal and plowing plans relative to Wetland Resource Areas;  Winter Road Salt and/or Sand Use and Storage restrictions;  Street sweeping schedules;  Provisions for prevention of illicit discharges to the stormwater management system;  Documentation that Stormwater BMPs are designed to provide for shutdown and containment in the event of a spill or discharges to or near critical areas or from LUHPPL;  Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan;  List of Emergency contacts for implementing Long-Term Pollution Prevention Plan. A Long-Term Pollution Prevention Plan is attached to Stormwater Report and is included as an attachment to the Wetlands Notice of Intent. Treatment BMPs subject to the 44% TSS removal pretreatment requirement and the one inch rule for calculating the water quality volume are included, and discharge: is within the Zone II or Interim Wellhead Protection Area is near or to other critical areas is within soils with a rapid infiltration rate (greater than 2.4 inches per hour) involves runoff from land uses with higher potential pollutant loads. The Required Water Quality Volume is reduced through use of the LID site Design Credits. Calculations documenting that the treatment train meets the 80% TSS removal requirement and, if applicable, the 44% TSS removal pretreatment requirement, are provided. 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 6 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 4: Water Quality (continued) The BMP is sized (and calculations provided) based on: The ½” or 1” Water Quality Volume or The equivalent flow rate associated with the Water Quality Volume and documentation is provided showing that the BMP treats the required water quality volume. The applicant proposes to use proprietary BMPs, and documentation supporting use of proprietary BMP and proposed TSS removal rate is provided. This documentation may be in the form of the propriety BMP checklist found in Volume 2, Chapter 4 of the Massachusetts Stormwater Handbook and submitting copies of the TARP Report, STEP Report, and/or other third party studies verifying performance of the proprietary BMPs. A TMDL exists that indicates a need to reduce pollutants other than TSS and documentation showing that the BMPs selected are consistent with the TMDL is provided. Standard 5: Land Uses With Higher Potential Pollutant Loads (LUHPPLs) The NPDES Multi-Sector General Permit covers the land use and the Stormwater Pollution Prevention Plan (SWPPP) has been included with the Stormwater Report. The NPDES Multi-Sector General Permit covers the land use and the SWPPP will be submitted prior to the discharge of stormwater to the post-construction stormwater BMPs. The NPDES Multi-Sector General Permit does not cover the land use. LUHPPLs are located at the site and industry specific source control and pollution prevention measures have been proposed to reduce or eliminate the exposure of LUHPPLs to rain, snow, snow melt and runoff, and been included in the long term Pollution Prevention Plan. All exposure has been eliminated. All exposure has not been eliminated and all BMPs selected are on MassDEP LUHPPL list. The LUHPPL has the potential to generate runoff with moderate to higher concentrations of oil and grease (e.g. all parking lots with >1000 vehicle trips per day) and the treatment train includes an oil grit separator, a filtering bioretention area, a sand filter or equivalent. Standard 6: Critical Areas The discharge is near or to a critical area and the treatment train includes only BMPs that MassDEP has approved for stormwater discharges to or near that particular class of critical area. Critical areas and BMPs are identified in the Stormwater Report. 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 7 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 7: Redevelopments and Other Projects Subject to the Standards only to the maximum extent practicable The project is subject to the Stormwater Management Standards only to the maximum Extent Practicable as a: Limited Project Small Residential Projects: 5-9 single family houses or 5-9 units in a multi-family development provided there is no discharge that may potentially affect a critical area. Small Residential Projects: 2-4 single family houses or 2-4 units in a multi-family development with a discharge to a critical area Marina and/or boatyard provided the hull painting, service and maintenance areas are protected from exposure to rain, snow, snow melt and runoff Bike Path and/or Foot Path Redevelopment Project Redevelopment portion of mix of new and redevelopment. Certain standards are not fully met (Standard No. 1, 8, 9, and 10 must always be fully met) and an explanation of why these standards are not met is contained in the Stormwater Report. The project involves redevelopment and a description of all measures that have been taken to im prove existing conditions is provided in the Stormwater Report. The redevelopment checklist found in Volume 2 Chapter 3 of the Massachusetts Stormwater Handbook may be used to document that the proposed stormwater management system (a) complies with Standards 2, 3 and the pretreatment and structural BMP requirements of Standards 4-6 to the maximum extent practicable and (b) improves existing conditions. Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan must include the following information:  Narrative;  Construction Period Operation and Maintenance Plan;  Names of Persons or Entity Responsible for Plan Compliance;  Construction Period Pollution Prevention Measures;  Erosion and Sedimentation Control Plan Drawings;  Detail drawings and specifications for erosion control BMPs, including sizing calculations;  Vegetation Planning;  Site Development Plan;  Construction Sequencing Plan;  Sequencing of Erosion and Sedimentation Controls;  Operation and Maintenance of Erosion and Sedimentation Controls;  Inspection Schedule;  Maintenance Schedule;  Inspection and Maintenance Log Form. A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan containing the information set forth above has been included in the Stormwater Report. 02 MassDEP SW Checklist • 04/01/08 Stormwater Report Checklist • Page 8 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control (continued) The project is highly complex and information is included in the Stormwater Report that explains why it is not possible to submit the Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan with the application. A Construction Period Pollution Prevention and Erosion and Sedimentation Control has not been included in the Stormwater Report but will be submitted before land disturbance begins. The project is not covered by a NPDES Construction General Permit. The project is covered by a NPDES Construction General Permit and a copy of the SWPPP is in the Stormwater Report. The project is covered by a NPDES Construction General Permit but no SWPPP been submitted. The SWPPP will be submitted BEFORE land disturbance begins. Standard 9: Operation and Maintenance Plan The Post Construction Operation and Maintenance Plan is included in the Stormwater R eport and includes the following information: Name of the stormwater management system owners; Party responsible for operation and maintenance; Schedule for implementation of routine and non-routine maintenance tasks; Plan showing the location of all stormwater BMPs maintenance access areas; Description and delineation of public safety features; Estimated operation and maintenance budget; and Operation and Maintenance Log Form. The responsible party is not the owner of the parcel where the BMP is located and the Stormwater Report includes the following submissions: A copy of the legal instrument (deed, homeowner’s association, utility trust or other legal entity) that establishes the terms of and legal responsibility for the operation and maintenance of the project site stormwater BMPs; A plan and easement deed that allows site access for the legal entity to operate and maintain BMP functions. Standard 10: Prohibition of Illicit Discharges The Long-Term Pollution Prevention Plan includes measures to prevent illicit discharges; An Illicit Discharge Compliance Statement is attached; NO Illicit Discharge Compliance Statement is attached but will be submitted prior to the discharge of any stormwater to post-construction BMPs. ATTACHMENT 3 H-H MODEL BACKUP INFORMATION NRCS Soils Report NOAA Atlas 14 (Precipitation Frequency Data) Hydrologic Soil Group—Barnstable County, Massachusetts (Gosnold St Soil HSGs) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/22/2023 Page 1 of 4461000046102004610400461060046108004611000461000046102004610400461060046108004611000392200392400392600392800393000393200393400393600393800 392000 392200 392400 392600 392800 393000 393200 393400 393600 393800 41° 38' 41'' N 70° 17' 48'' W41° 38' 41'' N70° 16' 27'' W41° 38' 2'' N 70° 17' 48'' W41° 38' 2'' N 70° 16' 27'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 19N WGS84 0 400 800 1600 2400 Feet 0 100 200 400 600 Meters Map Scale: 1:8,530 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:25,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Barnstable County, Massachusetts Survey Area Data: Version 20, Sep 12, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 10, 2022—Jun 30, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Barnstable County, Massachusetts (Gosnold St Soil HSGs) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/22/2023 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 66A Ipswich - Pawcatuck - Matunuck complex, 0 to 2 percent slopes, very frequently flooded A/D 27.3 10.1% 252A Carver coarse sand, 0 to 3 percent slopes A 56.4 21.0% 252B Carver coarse sand, 3 to 8 percent slopes A 144.0 53.5% 607 Water, saline 27.4 10.2% 610 Beaches, sand 8.8 3.3% 665 Udipsamments, smoothed 5.3 2.0% Totals for Area of Interest 269.3 100.0% Hydrologic Soil Group—Barnstable County, Massachusetts Gosnold St Soil HSGs Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/22/2023 Page 3 of 4 Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Barnstable County, Massachusetts Gosnold St Soil HSGs Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/22/2023 Page 4 of 4 12/28/23, 2:06 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.6394&lon=-70.2849&data=depth&units=english&series=pds 1/4 NOAA Atlas 14, Volume 10, Version 3 Location name: Hyannis, Massachusetts, USA* Latitude: 41.6394°, Longitude: -70.2849° Elevation: 17 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 0.266 (0.217‑0.323) 0.336 (0.275‑0.410) 0.451 (0.368‑0.552) 0.548 (0.443‑0.674) 0.680 (0.528‑0.880) 0.778 (0.591‑1.03) 0.883 (0.649‑1.22) 1.01 (0.688‑1.42) 1.20 (0.781‑1.74) 1.36 (0.862‑2.02) 10-min 0.377 (0.308‑0.458) 0.477 (0.389‑0.581) 0.641 (0.521‑0.784) 0.776 (0.627‑0.954) 0.963 (0.748‑1.25) 1.10 (0.836‑1.46) 1.25 (0.919‑1.73) 1.43 (0.974‑2.00) 1.70 (1.11‑2.47) 1.93 (1.22‑2.86) 15-min 0.443 (0.362‑0.539) 0.561 (0.458‑0.683) 0.754 (0.613‑0.922) 0.913 (0.738‑1.12) 1.13 (0.881‑1.47) 1.30 (0.985‑1.72) 1.47 (1.08‑2.04) 1.68 (1.15‑2.36) 2.00 (1.30‑2.91) 2.27 (1.44‑3.37) 30-min 0.658 (0.539‑0.801) 0.829 (0.677‑1.01) 1.11 (0.900‑1.35) 1.34 (1.08‑1.65) 1.66 (1.29‑2.14) 1.89 (1.44‑2.51) 2.14 (1.58‑2.97) 2.45 (1.67‑3.44) 2.92 (1.90‑4.24) 3.31 (2.10‑4.91) 60-min 0.874 (0.715‑1.06) 1.10 (0.896‑1.34) 1.46 (1.19‑1.78) 1.76 (1.42‑2.16) 2.18 (1.69‑2.82) 2.48 (1.89‑3.30) 2.82 (2.07‑3.90) 3.22 (2.19‑4.51) 3.83 (2.49‑5.56) 4.35 (2.75‑6.45) 2-hr 1.23 (1.01‑1.49) 1.52 (1.25‑1.84) 2.01 (1.65‑2.44) 2.41 (1.96‑2.94) 2.96 (2.32‑3.80) 3.37 (2.58‑4.43) 3.82 (2.83‑5.23) 4.35 (2.99‑6.03) 5.16 (3.40‑7.41) 5.86 (3.75‑8.58) 3-hr 1.47 (1.22‑1.77) 1.81 (1.50‑2.18) 2.37 (1.95‑2.86) 2.83 (2.31‑3.44) 3.46 (2.73‑4.42) 3.94 (3.03‑5.14) 4.44 (3.31‑6.05) 5.06 (3.50‑6.96) 5.98 (3.96‑8.52) 6.77 (4.36‑9.83) 6-hr 1.93 (1.60‑2.30) 2.34 (1.94‑2.80) 3.01 (2.49‑3.62) 3.57 (2.94‑4.31) 4.34 (3.44‑5.48) 4.91 (3.80‑6.34) 5.53 (4.14‑7.41) 6.25 (4.37‑8.50) 7.32 (4.89‑10.3) 8.22 (5.35‑11.8) 12-hr 2.42 (2.02‑2.87) 2.89 (2.42‑3.43) 3.66 (3.05‑4.36) 4.30 (3.56‑5.15) 5.18 (4.13‑6.46) 5.84 (4.54‑7.44) 6.54 (4.91‑8.61) 7.32 (5.17‑9.83) 8.46 (5.72‑11.7) 9.39 (6.18‑13.3) 24-hr 2.87 (2.42‑3.38) 3.39 (2.85‑4.00) 4.24 (3.56‑5.02) 4.94 (4.12‑5.88) 5.91 (4.74‑7.29) 6.64 (5.20‑8.35) 7.40 (5.59‑9.59) 8.22 (5.87‑10.9) 9.38 (6.41‑12.8) 10.3 (6.85‑14.4) 2-day 3.27 (2.78‑3.83) 3.82 (3.24‑4.48) 4.72 (3.99‑5.55) 5.47 (4.59‑6.46) 6.50 (5.25‑7.94) 7.28 (5.74‑9.04) 8.08 (6.14‑10.3) 8.93 (6.45‑11.7) 10.1 (6.98‑13.6) 11.0 (7.41‑15.1) 3-day 3.54 (3.02‑4.13) 4.10 (3.49‑4.79) 5.02 (4.26‑5.87) 5.78 (4.87‑6.79) 6.82 (5.54‑8.29) 7.62 (6.04‑9.41) 8.43 (6.44‑10.7) 9.30 (6.75‑12.1) 10.5 (7.29‑14.0) 11.4 (7.72‑15.5) 4-day 3.78 (3.23‑4.40) 4.34 (3.71‑5.05) 5.26 (4.48‑6.14) 6.02 (5.09‑7.06) 7.07 (5.76‑8.56) 7.87 (6.26‑9.69) 8.69 (6.68‑11.0) 9.57 (6.98‑12.4) 10.8 (7.54‑14.4) 11.8 (7.99‑15.9) 7-day 4.41 (3.79‑5.10) 4.98 (4.28‑5.76) 5.92 (5.06‑6.86) 6.69 (5.69‑7.79) 7.75 (6.36‑9.31) 8.56 (6.86‑10.4) 9.39 (7.26‑11.8) 10.3 (7.56‑13.2) 11.5 (8.10‑15.1) 12.4 (8.53‑16.7) 10-day 5.01 (4.32‑5.77) 5.60 (4.82‑6.45) 6.56 (5.63‑7.58) 7.36 (6.28‑8.54) 8.46 (6.97‑10.1) 9.31 (7.48‑11.3) 10.2 (7.88‑12.6) 11.1 (8.18‑14.1) 12.3 (8.70‑16.0) 13.2 (9.12‑17.6) 20-day 6.82 (5.92‑7.80) 7.50 (6.51‑8.59) 8.63 (7.46‑9.90) 9.56 (8.22‑11.0) 10.8 (8.99‑12.8) 11.8 (9.58‑14.2) 12.8 (9.99‑15.7) 13.8 (10.3‑17.3) 15.0 (10.8‑19.3) 15.9 (11.1‑20.8) 30-day 8.38 (7.31‑9.55) 9.16 (7.98‑10.4) 10.4 (9.06‑11.9) 11.5 (9.92‑13.2) 12.9 (10.8‑15.2) 14.1 (11.4‑16.7) 15.2 (11.9‑18.3) 16.2 (12.2‑20.2) 17.4 (12.6‑22.3) 18.3 (12.9‑23.8) 45-day 10.4 (9.11‑11.8) 11.3 (9.88‑12.8) 12.7 (11.1‑14.5) 14.0 (12.1‑15.9) 15.6 (13.0‑18.2) 16.9 (13.8‑19.9) 18.2 (14.2‑21.7) 19.3 (14.6‑23.8) 20.6 (15.0‑26.1) 21.4 (15.2‑27.6) 60-day 12.2 (10.7‑13.7) 13.1 (11.5‑14.9) 14.7 (12.9‑16.7) 16.1 (14.0‑18.3) 17.9 (15.0‑20.7) 19.3 (15.8‑22.7) 20.7 (16.3‑24.6) 21.9 (16.6‑26.9) 23.2 (17.0‑29.3) 24.1 (17.2‑30.8) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical 12/28/23, 2:06 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.6394&lon=-70.2849&data=depth&units=english&series=pds 2/4 Back to Top Maps & aerials Small scale terrain 12/28/23, 2:06 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.6394&lon=-70.2849&data=depth&units=english&series=pds 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 12/28/23, 2:06 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.6394&lon=-70.2849&data=depth&units=english&series=pds 4/4 Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi ATTACHMENT 4 EXISTING AND PROPOSED DRAINAGE AREA MAPS ATTACHMENT 5 EXISTING MODEL REPORT 1S SC-1 2S SC-2 3S SC-3 4S SC-4 5S SC-5 6S SC-6 7S SC-7 8S SC-8 1R AP-1 2R AP-2 3R AP-3 4R AP-4 5R AP-5 6R AP-6 7R AP-7 8R AP-8 Routing Diagram for Existing_GosnoldSt Prepared by Apex Companies, Printed 1/12/2024 HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 2HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 2yr24hr Type III 24-hr Default 24.00 1 3.39 2 2 10yr24hr Type III 24-hr Default 24.00 1 4.94 2 3 25yr24hr Type III 24-hr Default 24.00 1 5.91 2 4 100yr24hr Type III 24-hr Default 24.00 1 7.40 2 Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 3HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 2.311 36 (3S, 4S, 5S, 6S, 7S, 8S) 6.288 54 (3S, 4S, 5S, 6S, 7S, 8S) 2.784 98 (3S, 4S, 5S, 6S, 7S, 8S) 0.703 54 1/2 acre lots, 25% imp, HSG A (1S, 2S) 0.445 98 Paved parking, HSG A (1S, 2S) 0.285 36 Woods, Fair, HSG A (1S, 2S) 12.815 61 TOTAL AREA Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 4HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 11.383 11.383 3S, 4S, 5S, 6S, 7S, 8S 0.703 0.000 0.000 0.000 0.000 0.703 1/2 acre lots, 25% imp 1S, 2S 0.445 0.000 0.000 0.000 0.000 0.445 Paved parking 1S, 2S 0.285 0.000 0.000 0.000 0.000 0.285 Woods, Fair 1S, 2S 1.433 0.000 0.000 0.000 11.383 12.815 TOTAL AREA Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 5HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,521 sf 38.82% Impervious Runoff Depth>0.46"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=0.45 cfs 0.040 af Runoff Area=16,879 sf 55.38% Impervious Runoff Depth>0.95"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.31 cfs 0.031 af Runoff Area=44,946 sf 22.42% Impervious Runoff Depth>0.32"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=0.18 cfs 0.028 af Runoff Area=56,816 sf 31.96% Impervious Runoff Depth>0.45"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=0.28 cfs 0.049 af Runoff Area=100,078 sf 15.77% Impervious Runoff Depth>0.32"Subcatchment 5S: SC-5 Flow Length=279' Tc=22.7 min CN=57 Runoff=0.37 cfs 0.061 af Runoff Area=87,415 sf 29.18% Impervious Runoff Depth>0.57"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=0.77 cfs 0.096 af Runoff Area=72,602 sf 20.87% Impervious Runoff Depth>0.46"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=0.48 cfs 0.063 af Runoff Area=133,967 sf 27.33% Impervious Runoff Depth>0.54"Subcatchment 8S: SC-8 Flow Length=640' Tc=15.2 min CN=63 Runoff=1.24 cfs 0.137 af Inflow=0.45 cfs 0.040 afReach 1R: AP-1 Outflow=0.45 cfs 0.040 af Inflow=0.31 cfs 0.031 afReach 2R: AP-2 Outflow=0.31 cfs 0.031 af Inflow=0.18 cfs 0.028 afReach 3R: AP-3 Outflow=0.18 cfs 0.028 af Inflow=0.28 cfs 0.049 afReach 4R: AP-4 Outflow=0.28 cfs 0.049 af Inflow=0.37 cfs 0.061 afReach 5R: AP-5 Outflow=0.37 cfs 0.061 af Inflow=0.77 cfs 0.096 afReach 6R: AP-6 Outflow=0.77 cfs 0.096 af Inflow=0.48 cfs 0.063 afReach 7R: AP-7 Outflow=0.48 cfs 0.063 af Inflow=1.24 cfs 0.137 afReach 8R: AP-8 Outflow=1.24 cfs 0.137 af Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 6HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 0.505 af Average Runoff Depth = 0.47" 73.43% Pervious = 9.410 ac 26.57% Impervious = 3.405 ac Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 7HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af, Depth> 0.46" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description 11,160 36 Woods, Fair, HSG A 22,256 54 1/2 acre lots, 25% imp, HSG A 12,105 98 Paved parking, HSG A 45,521 61 Weighted Average 27,852 61.18% Pervious Area 17,669 38.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 8HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=45,521 sf Runoff Volume=0.040 af Runoff Depth>0.46" Flow Length=471' Tc=5.0 min CN=61 0.45 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 9HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.15 12.25 2.19 0.11 0.31 12.50 2.38 0.16 0.18 12.75 2.47 0.19 0.10 13.00 2.54 0.21 0.09 13.25 2.60 0.23 0.08 13.50 2.66 0.24 0.07 13.75 2.71 0.26 0.07 14.00 2.75 0.28 0.06 14.25 2.79 0.29 0.06 14.50 2.83 0.30 0.06 14.75 2.86 0.31 0.05 15.00 2.90 0.33 0.05 15.25 2.93 0.34 0.05 15.50 2.95 0.35 0.04 15.75 2.98 0.36 0.04 16.00 3.00 0.37 0.04 16.25 3.03 0.37 0.03 16.50 3.05 0.38 0.03 16.75 3.06 0.39 0.03 17.00 3.08 0.40 0.03 17.25 3.10 0.40 0.03 17.50 3.12 0.41 0.03 17.75 3.13 0.42 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.02 18.25 3.16 0.43 0.02 18.50 3.17 0.43 0.02 18.75 3.19 0.44 0.02 19.00 3.20 0.44 0.02 19.25 3.21 0.45 0.02 19.50 3.22 0.45 0.02 19.75 3.23 0.46 0.02 20.00 3.24 0.46 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 10HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af, Depth> 0.95" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,352 54 1/2 acre lots, 25% imp, HSG A 7,259 98 Paved parking, HSG A 16,879 72 Weighted Average 7,532 44.62% Pervious Area 9,347 55.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Dev. Open Space Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=16,879 sf Runoff Volume=0.031 af Runoff Depth>0.95" Flow Length=316' Tc=18.0 min CN=72 0.31 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 11HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.01 0.01 11.75 1.20 0.04 0.02 12.00 1.69 0.18 0.09 12.25 2.19 0.37 0.31 12.50 2.38 0.47 0.22 12.75 2.47 0.51 0.11 13.00 2.54 0.55 0.07 13.25 2.60 0.58 0.05 13.50 2.66 0.61 0.05 13.75 2.71 0.64 0.04 14.00 2.75 0.66 0.04 14.25 2.79 0.69 0.04 14.50 2.83 0.71 0.03 14.75 2.86 0.73 0.03 15.00 2.90 0.75 0.03 15.25 2.93 0.76 0.03 15.50 2.95 0.78 0.03 15.75 2.98 0.80 0.02 16.00 3.00 0.81 0.02 16.25 3.03 0.82 0.02 16.50 3.05 0.84 0.02 16.75 3.06 0.85 0.02 17.00 3.08 0.86 0.02 17.25 3.10 0.87 0.02 17.50 3.12 0.88 0.02 17.75 3.13 0.89 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.90 0.01 18.25 3.16 0.90 0.01 18.50 3.17 0.91 0.01 18.75 3.19 0.92 0.01 19.00 3.20 0.93 0.01 19.25 3.21 0.94 0.01 19.50 3.22 0.94 0.01 19.75 3.23 0.95 0.01 20.00 3.24 0.96 0.01 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 12HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af, Depth> 0.32" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 17,792 36 * 17,075 54 * 10,079 98 44,946 57 Weighted Average 34,867 77.58% Pervious Area 10,079 22.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 13HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=44,946 sf Runoff Volume=0.028 af Runoff Depth>0.32" Flow Length=464' Tc=17.6 min CN=57 0.18 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 14HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.00 0.00 12.25 2.19 0.06 0.13 12.50 2.38 0.09 0.17 12.75 2.47 0.11 0.11 13.00 2.54 0.12 0.08 13.25 2.60 0.14 0.06 13.50 2.66 0.15 0.06 13.75 2.71 0.16 0.05 14.00 2.75 0.18 0.05 14.25 2.79 0.19 0.05 14.50 2.83 0.20 0.04 14.75 2.86 0.21 0.04 15.00 2.90 0.22 0.04 15.25 2.93 0.22 0.04 15.50 2.95 0.23 0.04 15.75 2.98 0.24 0.03 16.00 3.00 0.25 0.03 16.25 3.03 0.25 0.03 16.50 3.05 0.26 0.03 16.75 3.06 0.27 0.03 17.00 3.08 0.27 0.02 17.25 3.10 0.28 0.02 17.50 3.12 0.28 0.02 17.75 3.13 0.29 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.29 0.02 18.25 3.16 0.30 0.02 18.50 3.17 0.30 0.02 18.75 3.19 0.30 0.02 19.00 3.20 0.31 0.02 19.25 3.21 0.31 0.02 19.50 3.22 0.32 0.02 19.75 3.23 0.32 0.02 20.00 3.24 0.32 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 15HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af, Depth> 0.45" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 21,523 36 * 17,133 54 * 18,160 98 56,816 61 Weighted Average 38,656 68.04% Pervious Area 18,160 31.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 16HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=56,816 sf Runoff Volume=0.049 af Runoff Depth>0.45" Flow Length=679' Tc=42.9 min CN=61 0.28 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 17HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.00 12.25 2.19 0.11 0.05 12.50 2.38 0.16 0.21 12.75 2.47 0.19 0.28 13.00 2.54 0.21 0.23 13.25 2.60 0.23 0.17 13.50 2.66 0.24 0.13 13.75 2.71 0.26 0.11 14.00 2.75 0.28 0.10 14.25 2.79 0.29 0.09 14.50 2.83 0.30 0.08 14.75 2.86 0.31 0.07 15.00 2.90 0.33 0.07 15.25 2.93 0.34 0.07 15.50 2.95 0.35 0.06 15.75 2.98 0.36 0.06 16.00 3.00 0.37 0.06 16.25 3.03 0.37 0.05 16.50 3.05 0.38 0.05 16.75 3.06 0.39 0.04 17.00 3.08 0.40 0.04 17.25 3.10 0.40 0.04 17.50 3.12 0.41 0.04 17.75 3.13 0.42 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.03 18.25 3.16 0.43 0.03 18.50 3.17 0.43 0.03 18.75 3.19 0.44 0.03 19.00 3.20 0.44 0.03 19.25 3.21 0.45 0.03 19.50 3.22 0.45 0.03 19.75 3.23 0.46 0.03 20.00 3.24 0.46 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 18HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 0.37 cfs @ 12.51 hrs, Volume= 0.061 af, Depth> 0.32" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 20,622 36 * 63,670 54 * 15,786 98 100,078 57 Weighted Average 84,292 84.23% Pervious Area 15,786 15.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 1.7 169 0.0070 1.70 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 22.7 279 Total Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 19HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=100,078 sf Runoff Volume=0.061 af Runoff Depth>0.32" Flow Length=279' Tc=22.7 min CN=57 0.37 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 20HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.00 0.00 12.25 2.19 0.06 0.18 12.50 2.38 0.09 0.37 12.75 2.47 0.11 0.28 13.00 2.54 0.12 0.19 13.25 2.60 0.14 0.15 13.50 2.66 0.15 0.13 13.75 2.71 0.16 0.12 14.00 2.75 0.18 0.11 14.25 2.79 0.19 0.11 14.50 2.83 0.20 0.10 14.75 2.86 0.21 0.10 15.00 2.90 0.22 0.09 15.25 2.93 0.22 0.09 15.50 2.95 0.23 0.08 15.75 2.98 0.24 0.08 16.00 3.00 0.25 0.07 16.25 3.03 0.25 0.06 16.50 3.05 0.26 0.06 16.75 3.06 0.27 0.06 17.00 3.08 0.27 0.06 17.25 3.10 0.28 0.05 17.50 3.12 0.28 0.05 17.75 3.13 0.29 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.29 0.04 18.25 3.16 0.30 0.04 18.50 3.17 0.30 0.04 18.75 3.19 0.30 0.04 19.00 3.20 0.31 0.04 19.25 3.21 0.31 0.04 19.50 3.22 0.32 0.04 19.75 3.23 0.32 0.04 20.00 3.24 0.32 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 21HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af, Depth> 0.57" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 14,490 36 * 47,419 54 * 25,506 98 87,415 64 Weighted Average 61,909 70.82% Pervious Area 25,506 29.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=87,415 sf Runoff Volume=0.096 af Runoff Depth>0.57" Flow Length=520' Tc=23.1 min CN=64 0.77 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 22HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.05 0.05 12.25 2.19 0.17 0.60 12.50 2.38 0.23 0.72 12.75 2.47 0.26 0.45 13.00 2.54 0.29 0.28 13.25 2.60 0.31 0.21 13.50 2.66 0.33 0.18 13.75 2.71 0.35 0.17 14.00 2.75 0.36 0.15 14.25 2.79 0.38 0.14 14.50 2.83 0.40 0.13 14.75 2.86 0.41 0.12 15.00 2.90 0.42 0.12 15.25 2.93 0.44 0.11 15.50 2.95 0.45 0.10 15.75 2.98 0.46 0.10 16.00 3.00 0.47 0.09 16.25 3.03 0.48 0.08 16.50 3.05 0.49 0.08 16.75 3.06 0.50 0.07 17.00 3.08 0.51 0.07 17.25 3.10 0.51 0.07 17.50 3.12 0.52 0.06 17.75 3.13 0.53 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.53 0.06 18.25 3.16 0.54 0.05 18.50 3.17 0.55 0.05 18.75 3.19 0.55 0.05 19.00 3.20 0.56 0.05 19.25 3.21 0.56 0.05 19.50 3.22 0.57 0.05 19.75 3.23 0.57 0.04 20.00 3.24 0.58 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 23HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af, Depth> 0.46" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 7,170 36 * 50,283 54 * 15,149 98 72,602 61 Weighted Average 57,453 79.13% Pervious Area 15,149 20.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 24HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=72,602 sf Runoff Volume=0.063 af Runoff Depth>0.46" Flow Length=248' Tc=20.4 min CN=61 0.48 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 25HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.01 12.25 2.19 0.11 0.39 12.50 2.38 0.16 0.45 12.75 2.47 0.19 0.27 13.00 2.54 0.21 0.18 13.25 2.60 0.23 0.14 13.50 2.66 0.24 0.12 13.75 2.71 0.26 0.11 14.00 2.75 0.28 0.11 14.25 2.79 0.29 0.10 14.50 2.83 0.30 0.09 14.75 2.86 0.31 0.09 15.00 2.90 0.33 0.08 15.25 2.93 0.34 0.08 15.50 2.95 0.35 0.07 15.75 2.98 0.36 0.07 16.00 3.00 0.37 0.06 16.25 3.03 0.37 0.06 16.50 3.05 0.38 0.05 16.75 3.06 0.39 0.05 17.00 3.08 0.40 0.05 17.25 3.10 0.40 0.05 17.50 3.12 0.41 0.05 17.75 3.13 0.42 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.04 18.25 3.16 0.43 0.04 18.50 3.17 0.43 0.04 18.75 3.19 0.44 0.04 19.00 3.20 0.44 0.03 19.25 3.21 0.45 0.03 19.50 3.22 0.45 0.03 19.75 3.23 0.46 0.03 20.00 3.24 0.46 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 26HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af, Depth> 0.54" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 19,053 36 * 78,305 54 * 36,609 98 133,967 63 Weighted Average 97,358 72.67% Pervious Area 36,609 27.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 408 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 640 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=133,967 sf Runoff Volume=0.137 af Runoff Depth>0.54" Flow Length=640' Tc=15.2 min CN=63 1.24 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 27HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.04 0.14 12.25 2.19 0.15 1.23 12.50 2.38 0.21 0.92 12.75 2.47 0.23 0.47 13.00 2.54 0.26 0.33 13.25 2.60 0.28 0.27 13.50 2.66 0.30 0.25 13.75 2.71 0.32 0.23 14.00 2.75 0.33 0.21 14.25 2.79 0.35 0.20 14.50 2.83 0.36 0.19 14.75 2.86 0.38 0.18 15.00 2.90 0.39 0.17 15.25 2.93 0.40 0.16 15.50 2.95 0.41 0.15 15.75 2.98 0.42 0.14 16.00 3.00 0.43 0.13 16.25 3.03 0.44 0.12 16.50 3.05 0.45 0.11 16.75 3.06 0.46 0.10 17.00 3.08 0.47 0.10 17.25 3.10 0.48 0.09 17.50 3.12 0.48 0.09 17.75 3.13 0.49 0.08 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.50 0.08 18.25 3.16 0.50 0.07 18.50 3.17 0.51 0.07 18.75 3.19 0.51 0.07 19.00 3.20 0.52 0.07 19.25 3.21 0.52 0.07 19.50 3.22 0.53 0.07 19.75 3.23 0.53 0.06 20.00 3.24 0.54 0.06 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 28HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.82% Impervious, Inflow Depth > 0.46" for 2yr24hr event Inflow = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af Outflow = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.045 ac 0.45 cfs 0.45 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 29HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.15 0.15 12.25 0.31 0.31 12.50 0.18 0.18 12.75 0.10 0.10 13.00 0.09 0.09 13.25 0.08 0.08 13.50 0.07 0.07 13.75 0.07 0.07 14.00 0.06 0.06 14.25 0.06 0.06 14.50 0.06 0.06 14.75 0.05 0.05 15.00 0.05 0.05 15.25 0.05 0.05 15.50 0.04 0.04 15.75 0.04 0.04 16.00 0.04 0.04 16.25 0.03 0.03 16.50 0.03 0.03 16.75 0.03 0.03 17.00 0.03 0.03 17.25 0.03 0.03 17.50 0.03 0.03 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 30HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.38% Impervious, Inflow Depth > 0.95" for 2yr24hr event Inflow = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af Outflow = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.387 ac 0.31 cfs 0.31 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 31HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.02 0.02 12.00 0.09 0.09 12.25 0.31 0.31 12.50 0.22 0.22 12.75 0.11 0.11 13.00 0.07 0.07 13.25 0.05 0.05 13.50 0.05 0.05 13.75 0.04 0.04 14.00 0.04 0.04 14.25 0.04 0.04 14.50 0.03 0.03 14.75 0.03 0.03 15.00 0.03 0.03 15.25 0.03 0.03 15.50 0.03 0.03 15.75 0.02 0.02 16.00 0.02 0.02 16.25 0.02 0.02 16.50 0.02 0.02 16.75 0.02 0.02 17.00 0.02 0.02 17.25 0.02 0.02 17.50 0.02 0.02 17.75 0.02 0.02 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.01 0.01 18.25 0.01 0.01 18.50 0.01 0.01 18.75 0.01 0.01 19.00 0.01 0.01 19.25 0.01 0.01 19.50 0.01 0.01 19.75 0.01 0.01 20.00 0.01 0.01 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 32HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.42% Impervious, Inflow Depth > 0.32" for 2yr24hr event Inflow = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af Outflow = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=1.032 ac 0.18 cfs 0.18 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 33HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.13 0.13 12.50 0.17 0.17 12.75 0.11 0.11 13.00 0.08 0.08 13.25 0.06 0.06 13.50 0.06 0.06 13.75 0.05 0.05 14.00 0.05 0.05 14.25 0.05 0.05 14.50 0.04 0.04 14.75 0.04 0.04 15.00 0.04 0.04 15.25 0.04 0.04 15.50 0.04 0.04 15.75 0.03 0.03 16.00 0.03 0.03 16.25 0.03 0.03 16.50 0.03 0.03 16.75 0.03 0.03 17.00 0.02 0.02 17.25 0.02 0.02 17.50 0.02 0.02 17.75 0.02 0.02 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 34HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.96% Impervious, Inflow Depth > 0.45" for 2yr24hr event Inflow = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af Outflow = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.304 ac 0.28 cfs 0.28 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 35HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.05 0.05 12.50 0.21 0.21 12.75 0.28 0.28 13.00 0.23 0.23 13.25 0.17 0.17 13.50 0.13 0.13 13.75 0.11 0.11 14.00 0.10 0.10 14.25 0.09 0.09 14.50 0.08 0.08 14.75 0.07 0.07 15.00 0.07 0.07 15.25 0.07 0.07 15.50 0.06 0.06 15.75 0.06 0.06 16.00 0.06 0.06 16.25 0.05 0.05 16.50 0.05 0.05 16.75 0.04 0.04 17.00 0.04 0.04 17.25 0.04 0.04 17.50 0.04 0.04 17.75 0.04 0.04 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.03 0.03 18.25 0.03 0.03 18.50 0.03 0.03 18.75 0.03 0.03 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 36HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.77% Impervious, Inflow Depth > 0.32" for 2yr24hr event Inflow = 0.37 cfs @ 12.51 hrs, Volume= 0.061 af Outflow = 0.37 cfs @ 12.51 hrs, Volume= 0.061 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.297 ac 0.37 cfs 0.37 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 37HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.18 0.18 12.50 0.37 0.37 12.75 0.28 0.28 13.00 0.19 0.19 13.25 0.15 0.15 13.50 0.13 0.13 13.75 0.12 0.12 14.00 0.11 0.11 14.25 0.11 0.11 14.50 0.10 0.10 14.75 0.10 0.10 15.00 0.09 0.09 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.06 0.06 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 38HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 29.18% Impervious, Inflow Depth > 0.57" for 2yr24hr event Inflow = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af Outflow = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.007 ac 0.77 cfs 0.77 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 39HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.05 0.05 12.25 0.60 0.60 12.50 0.72 0.72 12.75 0.45 0.45 13.00 0.28 0.28 13.25 0.21 0.21 13.50 0.18 0.18 13.75 0.17 0.17 14.00 0.15 0.15 14.25 0.14 0.14 14.50 0.13 0.13 14.75 0.12 0.12 15.00 0.12 0.12 15.25 0.11 0.11 15.50 0.10 0.10 15.75 0.10 0.10 16.00 0.09 0.09 16.25 0.08 0.08 16.50 0.08 0.08 16.75 0.07 0.07 17.00 0.07 0.07 17.25 0.07 0.07 17.50 0.06 0.06 17.75 0.06 0.06 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.05 0.05 18.50 0.05 0.05 18.75 0.05 0.05 19.00 0.05 0.05 19.25 0.05 0.05 19.50 0.05 0.05 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 40HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.87% Impervious, Inflow Depth > 0.46" for 2yr24hr event Inflow = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af Outflow = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.667 ac 0.48 cfs 0.48 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 41HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.01 0.01 12.25 0.39 0.39 12.50 0.45 0.45 12.75 0.27 0.27 13.00 0.18 0.18 13.25 0.14 0.14 13.50 0.12 0.12 13.75 0.11 0.11 14.00 0.11 0.11 14.25 0.10 0.10 14.50 0.09 0.09 14.75 0.09 0.09 15.00 0.08 0.08 15.25 0.08 0.08 15.50 0.07 0.07 15.75 0.07 0.07 16.00 0.06 0.06 16.25 0.06 0.06 16.50 0.05 0.05 16.75 0.05 0.05 17.00 0.05 0.05 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.04 0.04 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 42HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 27.33% Impervious, Inflow Depth > 0.54" for 2yr24hr event Inflow = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af Outflow = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=3.075 ac 1.24 cfs 1.24 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 43HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.14 0.14 12.25 1.23 1.23 12.50 0.92 0.92 12.75 0.47 0.47 13.00 0.33 0.33 13.25 0.27 0.27 13.50 0.25 0.25 13.75 0.23 0.23 14.00 0.21 0.21 14.25 0.20 0.20 14.50 0.19 0.19 14.75 0.18 0.18 15.00 0.17 0.17 15.25 0.16 0.16 15.50 0.15 0.15 15.75 0.14 0.14 16.00 0.13 0.13 16.25 0.12 0.12 16.50 0.11 0.11 16.75 0.10 0.10 17.00 0.10 0.10 17.25 0.09 0.09 17.50 0.09 0.09 17.75 0.08 0.08 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.08 0.08 18.25 0.07 0.07 18.50 0.07 0.07 18.75 0.07 0.07 19.00 0.07 0.07 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.06 0.06 20.00 0.06 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 44HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,521 sf 38.82% Impervious Runoff Depth>1.21"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=1.50 cfs 0.105 af Runoff Area=16,879 sf 55.38% Impervious Runoff Depth>1.98"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.68 cfs 0.064 af Runoff Area=44,946 sf 22.42% Impervious Runoff Depth>0.95"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=0.76 cfs 0.082 af Runoff Area=56,816 sf 31.96% Impervious Runoff Depth>1.18"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=0.88 cfs 0.129 af Runoff Area=100,078 sf 15.77% Impervious Runoff Depth>0.95"Subcatchment 5S: SC-5 Flow Length=279' Tc=22.7 min CN=57 Runoff=1.54 cfs 0.182 af Runoff Area=87,415 sf 29.18% Impervious Runoff Depth>1.39"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=2.15 cfs 0.233 af Runoff Area=72,602 sf 20.87% Impervious Runoff Depth>1.20"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=1.56 cfs 0.166 af Runoff Area=133,967 sf 27.33% Impervious Runoff Depth>1.33"Subcatchment 8S: SC-8 Flow Length=640' Tc=15.2 min CN=63 Runoff=3.65 cfs 0.341 af Inflow=1.50 cfs 0.105 afReach 1R: AP-1 Outflow=1.50 cfs 0.105 af Inflow=0.68 cfs 0.064 afReach 2R: AP-2 Outflow=0.68 cfs 0.064 af Inflow=0.76 cfs 0.082 afReach 3R: AP-3 Outflow=0.76 cfs 0.082 af Inflow=0.88 cfs 0.129 afReach 4R: AP-4 Outflow=0.88 cfs 0.129 af Inflow=1.54 cfs 0.182 afReach 5R: AP-5 Outflow=1.54 cfs 0.182 af Inflow=2.15 cfs 0.233 afReach 6R: AP-6 Outflow=2.15 cfs 0.233 af Inflow=1.56 cfs 0.166 afReach 7R: AP-7 Outflow=1.56 cfs 0.166 af Inflow=3.65 cfs 0.341 afReach 8R: AP-8 Outflow=3.65 cfs 0.341 af Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 45HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 1.302 af Average Runoff Depth = 1.22" 73.43% Pervious = 9.410 ac 26.57% Impervious = 3.405 ac Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 46HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af, Depth> 1.21" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description 11,160 36 Woods, Fair, HSG A 22,256 54 1/2 acre lots, 25% imp, HSG A 12,105 98 Paved parking, HSG A 45,521 61 Weighted Average 27,852 61.18% Pervious Area 17,669 38.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 47HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=45,521 sf Runoff Volume=0.105 af Runoff Depth>1.21" Flow Length=471' Tc=5.0 min CN=61 1.50 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 48HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.03 11.75 1.75 0.03 0.15 12.00 2.47 0.19 0.82 12.25 3.19 0.44 0.83 12.50 3.47 0.56 0.42 12.75 3.60 0.62 0.25 13.00 3.70 0.67 0.20 13.25 3.79 0.71 0.17 13.50 3.87 0.75 0.16 13.75 3.94 0.78 0.15 14.00 4.01 0.82 0.13 14.25 4.07 0.85 0.13 14.50 4.12 0.87 0.12 14.75 4.17 0.90 0.11 15.00 4.22 0.93 0.11 15.25 4.26 0.95 0.10 15.50 4.31 0.97 0.09 15.75 4.34 0.99 0.08 16.00 4.38 1.01 0.08 16.25 4.41 1.03 0.07 16.50 4.44 1.04 0.07 16.75 4.47 1.06 0.07 17.00 4.49 1.08 0.06 17.25 4.52 1.09 0.06 17.50 4.54 1.10 0.06 17.75 4.56 1.12 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.05 18.25 4.60 1.14 0.05 18.50 4.62 1.15 0.05 18.75 4.64 1.16 0.04 19.00 4.66 1.17 0.04 19.25 4.68 1.18 0.04 19.50 4.69 1.19 0.04 19.75 4.71 1.20 0.04 20.00 4.73 1.21 0.04 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 49HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af, Depth> 1.98" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,352 54 1/2 acre lots, 25% imp, HSG A 7,259 98 Paved parking, HSG A 16,879 72 Weighted Average 7,532 44.62% Pervious Area 9,347 55.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Dev. Open Space Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=16,879 sf Runoff Volume=0.064 af Runoff Depth>1.98" Flow Length=316' Tc=18.0 min CN=72 0.68 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 50HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.01 0.00 10.25 1.00 0.01 0.01 10.50 1.07 0.02 0.01 10.75 1.15 0.03 0.02 11.00 1.24 0.05 0.02 11.25 1.34 0.07 0.03 11.50 1.47 0.11 0.04 11.75 1.75 0.20 0.08 12.00 2.47 0.51 0.24 12.25 3.19 0.92 0.67 12.50 3.47 1.10 0.44 12.75 3.60 1.19 0.21 13.00 3.70 1.26 0.13 13.25 3.79 1.32 0.10 13.50 3.87 1.37 0.09 13.75 3.94 1.42 0.08 14.00 4.01 1.46 0.07 14.25 4.07 1.51 0.07 14.50 4.12 1.54 0.06 14.75 4.17 1.58 0.06 15.00 4.22 1.62 0.06 15.25 4.26 1.65 0.05 15.50 4.31 1.68 0.05 15.75 4.34 1.71 0.04 16.00 4.38 1.73 0.04 16.25 4.41 1.75 0.04 16.50 4.44 1.77 0.04 16.75 4.47 1.80 0.03 17.00 4.49 1.82 0.03 17.25 4.52 1.83 0.03 17.50 4.54 1.85 0.03 17.75 4.56 1.87 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.88 0.02 18.25 4.60 1.90 0.02 18.50 4.62 1.91 0.02 18.75 4.64 1.93 0.02 19.00 4.66 1.94 0.02 19.25 4.68 1.95 0.02 19.50 4.69 1.97 0.02 19.75 4.71 1.98 0.02 20.00 4.73 1.99 0.02 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 51HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af, Depth> 0.95" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 17,792 36 * 17,075 54 * 10,079 98 44,946 57 Weighted Average 34,867 77.58% Pervious Area 10,079 22.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 52HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=44,946 sf Runoff Volume=0.082 af Runoff Depth>0.95" Flow Length=464' Tc=17.6 min CN=57 0.76 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 53HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.00 0.00 11.75 1.75 0.01 0.01 12.00 2.47 0.11 0.13 12.25 3.19 0.30 0.75 12.50 3.47 0.40 0.58 12.75 3.60 0.45 0.31 13.00 3.70 0.50 0.20 13.25 3.79 0.53 0.16 13.50 3.87 0.56 0.14 13.75 3.94 0.59 0.13 14.00 4.01 0.62 0.12 14.25 4.07 0.65 0.11 14.50 4.12 0.67 0.11 14.75 4.17 0.69 0.10 15.00 4.22 0.72 0.09 15.25 4.26 0.74 0.09 15.50 4.31 0.76 0.08 15.75 4.34 0.77 0.08 16.00 4.38 0.79 0.07 16.25 4.41 0.80 0.06 16.50 4.44 0.82 0.06 16.75 4.47 0.83 0.06 17.00 4.49 0.85 0.06 17.25 4.52 0.86 0.05 17.50 4.54 0.87 0.05 17.75 4.56 0.88 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 0.89 0.04 18.25 4.60 0.90 0.04 18.50 4.62 0.91 0.04 18.75 4.64 0.92 0.04 19.00 4.66 0.93 0.04 19.25 4.68 0.94 0.04 19.50 4.69 0.95 0.04 19.75 4.71 0.95 0.04 20.00 4.73 0.96 0.03 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 54HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af, Depth> 1.18" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 21,523 36 * 17,133 54 * 18,160 98 56,816 61 Weighted Average 38,656 68.04% Pervious Area 18,160 31.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 55HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=56,816 sf Runoff Volume=0.129 af Runoff Depth>1.18" Flow Length=679' Tc=42.9 min CN=61 0.88 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 56HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.00 11.75 1.75 0.03 0.01 12.00 2.47 0.19 0.07 12.25 3.19 0.44 0.33 12.50 3.47 0.56 0.78 12.75 3.60 0.62 0.85 13.00 3.70 0.67 0.62 13.25 3.79 0.71 0.43 13.50 3.87 0.75 0.32 13.75 3.94 0.78 0.26 14.00 4.01 0.82 0.22 14.25 4.07 0.85 0.20 14.50 4.12 0.87 0.18 14.75 4.17 0.90 0.16 15.00 4.22 0.93 0.15 15.25 4.26 0.95 0.14 15.50 4.31 0.97 0.14 15.75 4.34 0.99 0.13 16.00 4.38 1.01 0.12 16.25 4.41 1.03 0.11 16.50 4.44 1.04 0.10 16.75 4.47 1.06 0.09 17.00 4.49 1.08 0.09 17.25 4.52 1.09 0.08 17.50 4.54 1.10 0.08 17.75 4.56 1.12 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.07 18.25 4.60 1.14 0.07 18.50 4.62 1.15 0.06 18.75 4.64 1.16 0.06 19.00 4.66 1.17 0.06 19.25 4.68 1.18 0.06 19.50 4.69 1.19 0.05 19.75 4.71 1.20 0.05 20.00 4.73 1.21 0.05 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 57HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 1.54 cfs @ 12.38 hrs, Volume= 0.182 af, Depth> 0.95" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 20,622 36 * 63,670 54 * 15,786 98 100,078 57 Weighted Average 84,292 84.23% Pervious Area 15,786 15.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 1.7 169 0.0070 1.70 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 22.7 279 Total Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 58HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=100,078 sf Runoff Volume=0.182 af Runoff Depth>0.95" Flow Length=279' Tc=22.7 min CN=57 1.54 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 59HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.00 0.00 11.75 1.75 0.01 0.01 12.00 2.47 0.11 0.18 12.25 3.19 0.30 1.28 12.50 3.47 0.40 1.40 12.75 3.60 0.45 0.85 13.00 3.70 0.50 0.52 13.25 3.79 0.53 0.39 13.50 3.87 0.56 0.33 13.75 3.94 0.59 0.30 14.00 4.01 0.62 0.28 14.25 4.07 0.65 0.26 14.50 4.12 0.67 0.24 14.75 4.17 0.69 0.23 15.00 4.22 0.72 0.21 15.25 4.26 0.74 0.20 15.50 4.31 0.76 0.19 15.75 4.34 0.77 0.18 16.00 4.38 0.79 0.16 16.25 4.41 0.80 0.15 16.50 4.44 0.82 0.14 16.75 4.47 0.83 0.13 17.00 4.49 0.85 0.13 17.25 4.52 0.86 0.12 17.50 4.54 0.87 0.11 17.75 4.56 0.88 0.11 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 0.89 0.10 18.25 4.60 0.90 0.09 18.50 4.62 0.91 0.09 18.75 4.64 0.92 0.09 19.00 4.66 0.93 0.09 19.25 4.68 0.94 0.08 19.50 4.69 0.95 0.08 19.75 4.71 0.95 0.08 20.00 4.73 0.96 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 60HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af, Depth> 1.39" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 14,490 36 * 47,419 54 * 25,506 98 87,415 64 Weighted Average 61,909 70.82% Pervious Area 25,506 29.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=87,415 sf Runoff Volume=0.233 af Runoff Depth>1.39" Flow Length=520' Tc=23.1 min CN=64 2.15 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 61HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.01 0.02 11.50 1.47 0.02 0.05 11.75 1.75 0.06 0.13 12.00 2.47 0.26 0.49 12.25 3.19 0.55 1.91 12.50 3.47 0.69 1.84 12.75 3.60 0.76 1.06 13.00 3.70 0.81 0.63 13.25 3.79 0.86 0.46 13.50 3.87 0.90 0.38 13.75 3.94 0.94 0.35 14.00 4.01 0.98 0.32 14.25 4.07 1.01 0.29 14.50 4.12 1.04 0.27 14.75 4.17 1.07 0.25 15.00 4.22 1.10 0.24 15.25 4.26 1.12 0.23 15.50 4.31 1.15 0.21 15.75 4.34 1.17 0.19 16.00 4.38 1.19 0.18 16.25 4.41 1.21 0.16 16.50 4.44 1.23 0.15 16.75 4.47 1.25 0.14 17.00 4.49 1.26 0.14 17.25 4.52 1.28 0.13 17.50 4.54 1.29 0.12 17.75 4.56 1.30 0.12 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.32 0.11 18.25 4.60 1.33 0.10 18.50 4.62 1.34 0.10 18.75 4.64 1.35 0.10 19.00 4.66 1.36 0.09 19.25 4.68 1.38 0.09 19.50 4.69 1.39 0.09 19.75 4.71 1.40 0.09 20.00 4.73 1.41 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 62HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af, Depth> 1.20" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 7,170 36 * 50,283 54 * 15,149 98 72,602 61 Weighted Average 57,453 79.13% Pervious Area 15,149 20.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 63HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=72,602 sf Runoff Volume=0.166 af Runoff Depth>1.20" Flow Length=248' Tc=20.4 min CN=61 1.56 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 64HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.01 11.75 1.75 0.03 0.06 12.00 2.47 0.19 0.34 12.25 3.19 0.44 1.47 12.50 3.47 0.56 1.26 12.75 3.60 0.62 0.69 13.00 3.70 0.67 0.43 13.25 3.79 0.71 0.32 13.50 3.87 0.75 0.28 13.75 3.94 0.78 0.26 14.00 4.01 0.82 0.23 14.25 4.07 0.85 0.21 14.50 4.12 0.87 0.20 14.75 4.17 0.90 0.19 15.00 4.22 0.93 0.18 15.25 4.26 0.95 0.17 15.50 4.31 0.97 0.16 15.75 4.34 0.99 0.15 16.00 4.38 1.01 0.13 16.25 4.41 1.03 0.12 16.50 4.44 1.04 0.11 16.75 4.47 1.06 0.11 17.00 4.49 1.08 0.10 17.25 4.52 1.09 0.10 17.50 4.54 1.10 0.09 17.75 4.56 1.12 0.09 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.08 18.25 4.60 1.14 0.08 18.50 4.62 1.15 0.07 18.75 4.64 1.16 0.07 19.00 4.66 1.17 0.07 19.25 4.68 1.18 0.07 19.50 4.69 1.19 0.07 19.75 4.71 1.20 0.07 20.00 4.73 1.21 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 65HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af, Depth> 1.33" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 19,053 36 * 78,305 54 * 36,609 98 133,967 63 Weighted Average 97,358 72.67% Pervious Area 36,609 27.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 408 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 640 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=133,967 sf Runoff Volume=0.341 af Runoff Depth>1.33" Flow Length=640' Tc=15.2 min CN=63 3.65 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 66HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.03 11.50 1.47 0.01 0.09 11.75 1.75 0.05 0.27 12.00 2.47 0.23 1.11 12.25 3.19 0.51 3.63 12.50 3.47 0.64 2.24 12.75 3.60 0.71 1.07 13.00 3.70 0.76 0.74 13.25 3.79 0.81 0.59 13.50 3.87 0.85 0.53 13.75 3.94 0.89 0.49 14.00 4.01 0.92 0.45 14.25 4.07 0.95 0.41 14.50 4.12 0.98 0.39 14.75 4.17 1.01 0.37 15.00 4.22 1.04 0.35 15.25 4.26 1.07 0.32 15.50 4.31 1.09 0.30 15.75 4.34 1.11 0.28 16.00 4.38 1.13 0.25 16.25 4.41 1.15 0.23 16.50 4.44 1.17 0.22 16.75 4.47 1.18 0.21 17.00 4.49 1.20 0.20 17.25 4.52 1.21 0.19 17.50 4.54 1.23 0.18 17.75 4.56 1.24 0.17 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.25 0.16 18.25 4.60 1.26 0.15 18.50 4.62 1.28 0.14 18.75 4.64 1.29 0.14 19.00 4.66 1.30 0.14 19.25 4.68 1.31 0.13 19.50 4.69 1.32 0.13 19.75 4.71 1.33 0.13 20.00 4.73 1.34 0.12 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 67HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.82% Impervious, Inflow Depth > 1.21" for 10yr24hr event Inflow = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af Outflow = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.045 ac 1.50 cfs 1.50 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 68HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.03 0.03 11.75 0.15 0.15 12.00 0.82 0.82 12.25 0.83 0.83 12.50 0.42 0.42 12.75 0.25 0.25 13.00 0.20 0.20 13.25 0.17 0.17 13.50 0.16 0.16 13.75 0.15 0.15 14.00 0.13 0.13 14.25 0.13 0.13 14.50 0.12 0.12 14.75 0.11 0.11 15.00 0.11 0.11 15.25 0.10 0.10 15.50 0.09 0.09 15.75 0.08 0.08 16.00 0.08 0.08 16.25 0.07 0.07 16.50 0.07 0.07 16.75 0.07 0.07 17.00 0.06 0.06 17.25 0.06 0.06 17.50 0.06 0.06 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.05 0.05 18.25 0.05 0.05 18.50 0.05 0.05 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 69HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.38% Impervious, Inflow Depth > 1.98" for 10yr24hr event Inflow = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af Outflow = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.387 ac 0.68 cfs 0.68 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 70HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.01 0.01 10.50 0.01 0.01 10.75 0.02 0.02 11.00 0.02 0.02 11.25 0.03 0.03 11.50 0.04 0.04 11.75 0.08 0.08 12.00 0.24 0.24 12.25 0.67 0.67 12.50 0.44 0.44 12.75 0.21 0.21 13.00 0.13 0.13 13.25 0.10 0.10 13.50 0.09 0.09 13.75 0.08 0.08 14.00 0.07 0.07 14.25 0.07 0.07 14.50 0.06 0.06 14.75 0.06 0.06 15.00 0.06 0.06 15.25 0.05 0.05 15.50 0.05 0.05 15.75 0.04 0.04 16.00 0.04 0.04 16.25 0.04 0.04 16.50 0.04 0.04 16.75 0.03 0.03 17.00 0.03 0.03 17.25 0.03 0.03 17.50 0.03 0.03 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 71HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.42% Impervious, Inflow Depth > 0.95" for 10yr24hr event Inflow = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af Outflow = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.032 ac 0.76 cfs 0.76 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 72HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.01 0.01 12.00 0.13 0.13 12.25 0.75 0.75 12.50 0.58 0.58 12.75 0.31 0.31 13.00 0.20 0.20 13.25 0.16 0.16 13.50 0.14 0.14 13.75 0.13 0.13 14.00 0.12 0.12 14.25 0.11 0.11 14.50 0.11 0.11 14.75 0.10 0.10 15.00 0.09 0.09 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.06 0.06 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.03 0.03 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 73HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.96% Impervious, Inflow Depth > 1.18" for 10yr24hr event Inflow = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af Outflow = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.304 ac 0.88 cfs 0.88 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 74HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.01 0.01 12.00 0.07 0.07 12.25 0.33 0.33 12.50 0.78 0.78 12.75 0.85 0.85 13.00 0.62 0.62 13.25 0.43 0.43 13.50 0.32 0.32 13.75 0.26 0.26 14.00 0.22 0.22 14.25 0.20 0.20 14.50 0.18 0.18 14.75 0.16 0.16 15.00 0.15 0.15 15.25 0.14 0.14 15.50 0.14 0.14 15.75 0.13 0.13 16.00 0.12 0.12 16.25 0.11 0.11 16.50 0.10 0.10 16.75 0.09 0.09 17.00 0.09 0.09 17.25 0.08 0.08 17.50 0.08 0.08 17.75 0.07 0.07 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.07 0.07 18.25 0.07 0.07 18.50 0.06 0.06 18.75 0.06 0.06 19.00 0.06 0.06 19.25 0.06 0.06 19.50 0.05 0.05 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 75HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.77% Impervious, Inflow Depth > 0.95" for 10yr24hr event Inflow = 1.54 cfs @ 12.38 hrs, Volume= 0.182 af Outflow = 1.54 cfs @ 12.38 hrs, Volume= 0.182 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=2.297 ac 1.54 cfs 1.54 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 76HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.01 0.01 12.00 0.18 0.18 12.25 1.28 1.28 12.50 1.40 1.40 12.75 0.85 0.85 13.00 0.52 0.52 13.25 0.39 0.39 13.50 0.33 0.33 13.75 0.30 0.30 14.00 0.28 0.28 14.25 0.26 0.26 14.50 0.24 0.24 14.75 0.23 0.23 15.00 0.21 0.21 15.25 0.20 0.20 15.50 0.19 0.19 15.75 0.18 0.18 16.00 0.16 0.16 16.25 0.15 0.15 16.50 0.14 0.14 16.75 0.13 0.13 17.00 0.13 0.13 17.25 0.12 0.12 17.50 0.11 0.11 17.75 0.11 0.11 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.10 0.10 18.25 0.09 0.09 18.50 0.09 0.09 18.75 0.09 0.09 19.00 0.09 0.09 19.25 0.08 0.08 19.50 0.08 0.08 19.75 0.08 0.08 20.00 0.08 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 77HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 29.18% Impervious, Inflow Depth > 1.39" for 10yr24hr event Inflow = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af Outflow = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=2.007 ac 2.15 cfs 2.15 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 78HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.02 0.02 11.50 0.05 0.05 11.75 0.13 0.13 12.00 0.49 0.49 12.25 1.91 1.91 12.50 1.84 1.84 12.75 1.06 1.06 13.00 0.63 0.63 13.25 0.46 0.46 13.50 0.38 0.38 13.75 0.35 0.35 14.00 0.32 0.32 14.25 0.29 0.29 14.50 0.27 0.27 14.75 0.25 0.25 15.00 0.24 0.24 15.25 0.23 0.23 15.50 0.21 0.21 15.75 0.19 0.19 16.00 0.18 0.18 16.25 0.16 0.16 16.50 0.15 0.15 16.75 0.14 0.14 17.00 0.14 0.14 17.25 0.13 0.13 17.50 0.12 0.12 17.75 0.12 0.12 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.11 0.11 18.25 0.10 0.10 18.50 0.10 0.10 18.75 0.10 0.10 19.00 0.09 0.09 19.25 0.09 0.09 19.50 0.09 0.09 19.75 0.09 0.09 20.00 0.08 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 79HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.87% Impervious, Inflow Depth > 1.20" for 10yr24hr event Inflow = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af Outflow = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.667 ac 1.56 cfs 1.56 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 80HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.06 0.06 12.00 0.34 0.34 12.25 1.47 1.47 12.50 1.26 1.26 12.75 0.69 0.69 13.00 0.43 0.43 13.25 0.32 0.32 13.50 0.28 0.28 13.75 0.26 0.26 14.00 0.23 0.23 14.25 0.21 0.21 14.50 0.20 0.20 14.75 0.19 0.19 15.00 0.18 0.18 15.25 0.17 0.17 15.50 0.16 0.16 15.75 0.15 0.15 16.00 0.13 0.13 16.25 0.12 0.12 16.50 0.11 0.11 16.75 0.11 0.11 17.00 0.10 0.10 17.25 0.10 0.10 17.50 0.09 0.09 17.75 0.09 0.09 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.08 0.08 18.25 0.08 0.08 18.50 0.07 0.07 18.75 0.07 0.07 19.00 0.07 0.07 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.06 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 81HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 27.33% Impervious, Inflow Depth > 1.33" for 10yr24hr event Inflow = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af Outflow = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=3.075 ac 3.65 cfs 3.65 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 82HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.03 0.03 11.50 0.09 0.09 11.75 0.27 0.27 12.00 1.11 1.11 12.25 3.63 3.63 12.50 2.24 2.24 12.75 1.07 1.07 13.00 0.74 0.74 13.25 0.59 0.59 13.50 0.53 0.53 13.75 0.49 0.49 14.00 0.45 0.45 14.25 0.41 0.41 14.50 0.39 0.39 14.75 0.37 0.37 15.00 0.35 0.35 15.25 0.32 0.32 15.50 0.30 0.30 15.75 0.28 0.28 16.00 0.25 0.25 16.25 0.23 0.23 16.50 0.22 0.22 16.75 0.21 0.21 17.00 0.20 0.20 17.25 0.19 0.19 17.50 0.18 0.18 17.75 0.17 0.17 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.16 0.16 18.25 0.15 0.15 18.50 0.14 0.14 18.75 0.14 0.14 19.00 0.14 0.14 19.25 0.13 0.13 19.50 0.13 0.13 19.75 0.13 0.13 20.00 0.12 0.12 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 83HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,521 sf 38.82% Impervious Runoff Depth>1.78"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=2.28 cfs 0.155 af Runoff Area=16,879 sf 55.38% Impervious Runoff Depth>2.70"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.93 cfs 0.087 af Runoff Area=44,946 sf 22.42% Impervious Runoff Depth>1.46"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=1.25 cfs 0.126 af Runoff Area=56,816 sf 31.96% Impervious Runoff Depth>1.75"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=1.34 cfs 0.190 af Runoff Area=100,078 sf 15.77% Impervious Runoff Depth>1.46"Subcatchment 5S: SC-5 Flow Length=279' Tc=22.7 min CN=57 Runoff=2.52 cfs 0.279 af Runoff Area=87,415 sf 29.18% Impervious Runoff Depth>2.00"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=3.16 cfs 0.335 af Runoff Area=72,602 sf 20.87% Impervious Runoff Depth>1.76"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=2.39 cfs 0.245 af Runoff Area=133,967 sf 27.33% Impervious Runoff Depth>1.93"Subcatchment 8S: SC-8 Flow Length=640' Tc=15.2 min CN=63 Runoff=5.48 cfs 0.494 af Inflow=2.28 cfs 0.155 afReach 1R: AP-1 Outflow=2.28 cfs 0.155 af Inflow=0.93 cfs 0.087 afReach 2R: AP-2 Outflow=0.93 cfs 0.087 af Inflow=1.25 cfs 0.126 afReach 3R: AP-3 Outflow=1.25 cfs 0.126 af Inflow=1.34 cfs 0.190 afReach 4R: AP-4 Outflow=1.34 cfs 0.190 af Inflow=2.52 cfs 0.279 afReach 5R: AP-5 Outflow=2.52 cfs 0.279 af Inflow=3.16 cfs 0.335 afReach 6R: AP-6 Outflow=3.16 cfs 0.335 af Inflow=2.39 cfs 0.245 afReach 7R: AP-7 Outflow=2.39 cfs 0.245 af Inflow=5.48 cfs 0.494 afReach 8R: AP-8 Outflow=5.48 cfs 0.494 af Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 84HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 1.910 af Average Runoff Depth = 1.79" 73.43% Pervious = 9.410 ac 26.57% Impervious = 3.405 ac Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 85HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af, Depth> 1.78" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description 11,160 36 Woods, Fair, HSG A 22,256 54 1/2 acre lots, 25% imp, HSG A 12,105 98 Paved parking, HSG A 45,521 61 Weighted Average 27,852 61.18% Pervious Area 17,669 38.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 86HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=45,521 sf Runoff Volume=0.155 af Runoff Depth>1.78" Flow Length=471' Tc=5.0 min CN=61 2.28 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 87HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.01 11.00 1.48 0.01 0.02 11.25 1.60 0.02 0.05 11.50 1.76 0.03 0.09 11.75 2.10 0.09 0.31 12.00 2.95 0.35 1.34 12.25 3.81 0.72 1.20 12.50 4.15 0.89 0.60 12.75 4.31 0.97 0.34 13.00 4.43 1.04 0.27 13.25 4.54 1.10 0.24 13.50 4.63 1.15 0.22 13.75 4.72 1.20 0.20 14.00 4.79 1.25 0.18 14.25 4.86 1.29 0.17 14.50 4.93 1.33 0.16 14.75 4.99 1.36 0.15 15.00 5.05 1.40 0.14 15.25 5.10 1.43 0.13 15.50 5.15 1.46 0.12 15.75 5.20 1.49 0.11 16.00 5.24 1.51 0.10 16.25 5.27 1.54 0.10 16.50 5.31 1.56 0.09 16.75 5.34 1.58 0.09 17.00 5.38 1.60 0.08 17.25 5.41 1.62 0.08 17.50 5.43 1.64 0.07 17.75 5.46 1.65 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.06 18.25 5.51 1.68 0.06 18.50 5.53 1.70 0.06 18.75 5.55 1.71 0.06 19.00 5.57 1.73 0.06 19.25 5.60 1.74 0.06 19.50 5.62 1.75 0.06 19.75 5.64 1.77 0.05 20.00 5.66 1.78 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 88HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af, Depth> 2.70" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,352 54 1/2 acre lots, 25% imp, HSG A 7,259 98 Paved parking, HSG A 16,879 72 Weighted Average 7,532 44.62% Pervious Area 9,347 55.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Dev. Open Space Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=16,879 sf Runoff Volume=0.087 af Runoff Depth>2.70" Flow Length=316' Tc=18.0 min CN=72 0.93 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 89HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.01 0.01 9.75 1.05 0.02 0.01 10.00 1.12 0.03 0.01 10.25 1.19 0.04 0.02 10.50 1.28 0.06 0.02 10.75 1.37 0.08 0.03 11.00 1.48 0.11 0.04 11.25 1.60 0.14 0.05 11.50 1.76 0.20 0.07 11.75 2.10 0.34 0.12 12.00 2.95 0.78 0.34 12.25 3.81 1.33 0.93 12.50 4.15 1.57 0.59 12.75 4.31 1.68 0.28 13.00 4.43 1.77 0.17 13.25 4.54 1.85 0.13 13.50 4.63 1.92 0.12 13.75 4.72 1.98 0.11 14.00 4.79 2.04 0.10 14.25 4.86 2.09 0.09 14.50 4.93 2.14 0.08 14.75 4.99 2.19 0.08 15.00 5.05 2.24 0.07 15.25 5.10 2.28 0.07 15.50 5.15 2.31 0.06 15.75 5.20 2.35 0.06 16.00 5.24 2.38 0.05 16.25 5.27 2.41 0.05 16.50 5.31 2.44 0.05 16.75 5.34 2.47 0.04 17.00 5.38 2.49 0.04 17.25 5.41 2.51 0.04 17.50 5.43 2.54 0.04 17.75 5.46 2.56 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 2.58 0.03 18.25 5.51 2.60 0.03 18.50 5.53 2.61 0.03 18.75 5.55 2.63 0.03 19.00 5.57 2.65 0.03 19.25 5.60 2.67 0.03 19.50 5.62 2.68 0.03 19.75 5.64 2.70 0.03 20.00 5.66 2.71 0.02 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 90HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af, Depth> 1.46" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 17,792 36 * 17,075 54 * 10,079 98 44,946 57 Weighted Average 34,867 77.58% Pervious Area 10,079 22.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 91HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=44,946 sf Runoff Volume=0.126 af Runoff Depth>1.46" Flow Length=464' Tc=17.6 min CN=57 1.25 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 92HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.00 0.00 11.25 1.60 0.00 0.00 11.50 1.76 0.01 0.01 11.75 2.10 0.04 0.06 12.00 2.95 0.23 0.31 12.25 3.81 0.54 1.24 12.50 4.15 0.68 0.89 12.75 4.31 0.76 0.45 13.00 4.43 0.82 0.29 13.25 4.54 0.87 0.23 13.50 4.63 0.91 0.20 13.75 4.72 0.96 0.19 14.00 4.79 1.00 0.17 14.25 4.86 1.03 0.16 14.50 4.93 1.07 0.15 14.75 4.99 1.10 0.14 15.00 5.05 1.13 0.13 15.25 5.10 1.16 0.12 15.50 5.15 1.19 0.12 15.75 5.20 1.21 0.11 16.00 5.24 1.23 0.10 16.25 5.27 1.25 0.09 16.50 5.31 1.27 0.08 16.75 5.34 1.29 0.08 17.00 5.38 1.31 0.08 17.25 5.41 1.33 0.07 17.50 5.43 1.34 0.07 17.75 5.46 1.36 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.37 0.06 18.25 5.51 1.39 0.06 18.50 5.53 1.40 0.06 18.75 5.55 1.41 0.05 19.00 5.57 1.42 0.05 19.25 5.60 1.44 0.05 19.50 5.62 1.45 0.05 19.75 5.64 1.46 0.05 20.00 5.66 1.47 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 93HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af, Depth> 1.75" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 21,523 36 * 17,133 54 * 18,160 98 56,816 61 Weighted Average 38,656 68.04% Pervious Area 18,160 31.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 94HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=56,816 sf Runoff Volume=0.190 af Runoff Depth>1.75" Flow Length=679' Tc=42.9 min CN=61 1.34 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 95HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.01 0.00 11.25 1.60 0.02 0.01 11.50 1.76 0.03 0.03 11.75 2.10 0.09 0.06 12.00 2.95 0.35 0.16 12.25 3.81 0.72 0.58 12.50 4.15 0.89 1.23 12.75 4.31 0.97 1.27 13.00 4.43 1.04 0.91 13.25 4.54 1.10 0.62 13.50 4.63 1.15 0.45 13.75 4.72 1.20 0.36 14.00 4.79 1.25 0.31 14.25 4.86 1.29 0.27 14.50 4.93 1.33 0.24 14.75 4.99 1.36 0.22 15.00 5.05 1.40 0.21 15.25 5.10 1.43 0.20 15.50 5.15 1.46 0.18 15.75 5.20 1.49 0.17 16.00 5.24 1.51 0.16 16.25 5.27 1.54 0.15 16.50 5.31 1.56 0.13 16.75 5.34 1.58 0.13 17.00 5.38 1.60 0.12 17.25 5.41 1.62 0.11 17.50 5.43 1.64 0.11 17.75 5.46 1.65 0.10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.09 18.25 5.51 1.68 0.09 18.50 5.53 1.70 0.08 18.75 5.55 1.71 0.08 19.00 5.57 1.73 0.08 19.25 5.60 1.74 0.08 19.50 5.62 1.75 0.07 19.75 5.64 1.77 0.07 20.00 5.66 1.78 0.07 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 96HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 2.52 cfs @ 12.36 hrs, Volume= 0.279 af, Depth> 1.46" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 20,622 36 * 63,670 54 * 15,786 98 100,078 57 Weighted Average 84,292 84.23% Pervious Area 15,786 15.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 1.7 169 0.0070 1.70 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 22.7 279 Total Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 97HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=100,078 sf Runoff Volume=0.279 af Runoff Depth>1.46" Flow Length=279' Tc=22.7 min CN=57 2.52 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 98HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.00 0.00 11.25 1.60 0.00 0.00 11.50 1.76 0.01 0.02 11.75 2.10 0.04 0.10 12.00 2.95 0.23 0.50 12.25 3.81 0.54 2.22 12.50 4.15 0.68 2.19 12.75 4.31 0.76 1.27 13.00 4.43 0.82 0.76 13.25 4.54 0.87 0.56 13.50 4.63 0.91 0.47 13.75 4.72 0.96 0.43 14.00 4.79 1.00 0.40 14.25 4.86 1.03 0.36 14.50 4.93 1.07 0.34 14.75 4.99 1.10 0.32 15.00 5.05 1.13 0.30 15.25 5.10 1.16 0.28 15.50 5.15 1.19 0.26 15.75 5.20 1.21 0.24 16.00 5.24 1.23 0.22 16.25 5.27 1.25 0.21 16.50 5.31 1.27 0.19 16.75 5.34 1.29 0.18 17.00 5.38 1.31 0.17 17.25 5.41 1.33 0.17 17.50 5.43 1.34 0.16 17.75 5.46 1.36 0.15 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.37 0.14 18.25 5.51 1.39 0.13 18.50 5.53 1.40 0.12 18.75 5.55 1.41 0.12 19.00 5.57 1.42 0.12 19.25 5.60 1.44 0.12 19.50 5.62 1.45 0.11 19.75 5.64 1.46 0.11 20.00 5.66 1.47 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 99HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af, Depth> 2.00" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 14,490 36 * 47,419 54 * 25,506 98 87,415 64 Weighted Average 61,909 70.82% Pervious Area 25,506 29.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)3 2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=87,415 sf Runoff Volume=0.335 af Runoff Depth>2.00" Flow Length=520' Tc=23.1 min CN=64 3.16 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 100HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.01 10.75 1.37 0.01 0.03 11.00 1.48 0.02 0.06 11.25 1.60 0.04 0.09 11.50 1.76 0.06 0.15 11.75 2.10 0.14 0.27 12.00 2.95 0.45 0.85 12.25 3.81 0.87 2.88 12.50 4.15 1.06 2.64 12.75 4.31 1.15 1.49 13.00 4.43 1.22 0.87 13.25 4.54 1.29 0.63 13.50 4.63 1.35 0.52 13.75 4.72 1.40 0.47 14.00 4.79 1.45 0.43 14.25 4.86 1.49 0.39 14.50 4.93 1.53 0.36 14.75 4.99 1.57 0.34 15.00 5.05 1.61 0.32 15.25 5.10 1.65 0.30 15.50 5.15 1.68 0.28 15.75 5.20 1.71 0.26 16.00 5.24 1.74 0.24 16.25 5.27 1.76 0.22 16.50 5.31 1.78 0.20 16.75 5.34 1.81 0.19 17.00 5.38 1.83 0.18 17.25 5.41 1.85 0.17 17.50 5.43 1.87 0.16 17.75 5.46 1.89 0.15 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.90 0.14 18.25 5.51 1.92 0.14 18.50 5.53 1.94 0.13 18.75 5.55 1.95 0.13 19.00 5.57 1.97 0.12 19.25 5.60 1.98 0.12 19.50 5.62 1.99 0.12 19.75 5.64 2.01 0.11 20.00 5.66 2.02 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 101HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af, Depth> 1.76" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 7,170 36 * 50,283 54 * 15,149 98 72,602 61 Weighted Average 57,453 79.13% Pervious Area 15,149 20.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 102HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=72,602 sf Runoff Volume=0.245 af Runoff Depth>1.76" Flow Length=248' Tc=20.4 min CN=61 2.39 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 103HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.01 0.02 11.25 1.60 0.02 0.04 11.50 1.76 0.03 0.08 11.75 2.10 0.09 0.18 12.00 2.95 0.35 0.64 12.25 3.81 0.72 2.30 12.50 4.15 0.89 1.85 12.75 4.31 0.97 0.98 13.00 4.43 1.04 0.60 13.25 4.54 1.10 0.45 13.50 4.63 1.15 0.39 13.75 4.72 1.20 0.35 14.00 4.79 1.25 0.32 14.25 4.86 1.29 0.29 14.50 4.93 1.33 0.27 14.75 4.99 1.36 0.26 15.00 5.05 1.40 0.24 15.25 5.10 1.43 0.23 15.50 5.15 1.46 0.21 15.75 5.20 1.49 0.20 16.00 5.24 1.51 0.18 16.25 5.27 1.54 0.17 16.50 5.31 1.56 0.16 16.75 5.34 1.58 0.15 17.00 5.38 1.60 0.14 17.25 5.41 1.62 0.13 17.50 5.43 1.64 0.13 17.75 5.46 1.65 0.12 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.11 18.25 5.51 1.68 0.10 18.50 5.53 1.70 0.10 18.75 5.55 1.71 0.10 19.00 5.57 1.73 0.10 19.25 5.60 1.74 0.09 19.50 5.62 1.75 0.09 19.75 5.64 1.77 0.09 20.00 5.66 1.78 0.09 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 104HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af, Depth> 1.93" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 19,053 36 * 78,305 54 * 36,609 98 133,967 63 Weighted Average 97,358 72.67% Pervious Area 36,609 27.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 408 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 640 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)6 5 4 3 2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=133,967 sf Runoff Volume=0.494 af Runoff Depth>1.93" Flow Length=640' Tc=15.2 min CN=63 5.48 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 105HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.01 10.75 1.37 0.01 0.04 11.00 1.48 0.01 0.08 11.25 1.60 0.03 0.14 11.50 1.76 0.05 0.24 11.75 2.10 0.13 0.55 12.00 2.95 0.41 1.88 12.25 3.81 0.82 5.39 12.50 4.15 1.00 3.18 12.75 4.31 1.09 1.50 13.00 4.43 1.16 1.02 13.25 4.54 1.22 0.81 13.50 4.63 1.28 0.73 13.75 4.72 1.33 0.67 14.00 4.79 1.38 0.61 14.25 4.86 1.42 0.56 14.50 4.93 1.46 0.53 14.75 4.99 1.50 0.50 15.00 5.05 1.54 0.47 15.25 5.10 1.57 0.44 15.50 5.15 1.61 0.40 15.75 5.20 1.63 0.37 16.00 5.24 1.66 0.34 16.25 5.27 1.68 0.31 16.50 5.31 1.71 0.30 16.75 5.34 1.73 0.28 17.00 5.38 1.75 0.27 17.25 5.41 1.77 0.25 17.50 5.43 1.79 0.24 17.75 5.46 1.81 0.22 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.82 0.21 18.25 5.51 1.84 0.20 18.50 5.53 1.86 0.19 18.75 5.55 1.87 0.19 19.00 5.57 1.88 0.18 19.25 5.60 1.90 0.18 19.50 5.62 1.91 0.17 19.75 5.64 1.93 0.17 20.00 5.66 1.94 0.17 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 106HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.82% Impervious, Inflow Depth > 1.78" for 25yr24hr event Inflow = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af Outflow = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.045 ac 2.28 cfs 2.28 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 107HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.01 0.01 11.00 0.02 0.02 11.25 0.05 0.05 11.50 0.09 0.09 11.75 0.31 0.31 12.00 1.34 1.34 12.25 1.20 1.20 12.50 0.60 0.60 12.75 0.34 0.34 13.00 0.27 0.27 13.25 0.24 0.24 13.50 0.22 0.22 13.75 0.20 0.20 14.00 0.18 0.18 14.25 0.17 0.17 14.50 0.16 0.16 14.75 0.15 0.15 15.00 0.14 0.14 15.25 0.13 0.13 15.50 0.12 0.12 15.75 0.11 0.11 16.00 0.10 0.10 16.25 0.10 0.10 16.50 0.09 0.09 16.75 0.09 0.09 17.00 0.08 0.08 17.25 0.08 0.08 17.50 0.07 0.07 17.75 0.07 0.07 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.06 0.06 18.50 0.06 0.06 18.75 0.06 0.06 19.00 0.06 0.06 19.25 0.06 0.06 19.50 0.06 0.06 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 108HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.38% Impervious, Inflow Depth > 2.70" for 25yr24hr event Inflow = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af Outflow = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=0.387 ac 0.93 cfs 0.93 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 109HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.01 0.01 9.75 0.01 0.01 10.00 0.01 0.01 10.25 0.02 0.02 10.50 0.02 0.02 10.75 0.03 0.03 11.00 0.04 0.04 11.25 0.05 0.05 11.50 0.07 0.07 11.75 0.12 0.12 12.00 0.34 0.34 12.25 0.93 0.93 12.50 0.59 0.59 12.75 0.28 0.28 13.00 0.17 0.17 13.25 0.13 0.13 13.50 0.12 0.12 13.75 0.11 0.11 14.00 0.10 0.10 14.25 0.09 0.09 14.50 0.08 0.08 14.75 0.08 0.08 15.00 0.07 0.07 15.25 0.07 0.07 15.50 0.06 0.06 15.75 0.06 0.06 16.00 0.05 0.05 16.25 0.05 0.05 16.50 0.05 0.05 16.75 0.04 0.04 17.00 0.04 0.04 17.25 0.04 0.04 17.50 0.04 0.04 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.03 0.03 18.25 0.03 0.03 18.50 0.03 0.03 18.75 0.03 0.03 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.02 0.02 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 110HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.42% Impervious, Inflow Depth > 1.46" for 25yr24hr event Inflow = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af Outflow = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.032 ac 1.25 cfs 1.25 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 111HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.06 0.06 12.00 0.31 0.31 12.25 1.24 1.24 12.50 0.89 0.89 12.75 0.45 0.45 13.00 0.29 0.29 13.25 0.23 0.23 13.50 0.20 0.20 13.75 0.19 0.19 14.00 0.17 0.17 14.25 0.16 0.16 14.50 0.15 0.15 14.75 0.14 0.14 15.00 0.13 0.13 15.25 0.12 0.12 15.50 0.12 0.12 15.75 0.11 0.11 16.00 0.10 0.10 16.25 0.09 0.09 16.50 0.08 0.08 16.75 0.08 0.08 17.00 0.08 0.08 17.25 0.07 0.07 17.50 0.07 0.07 17.75 0.06 0.06 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.06 0.06 18.50 0.06 0.06 18.75 0.05 0.05 19.00 0.05 0.05 19.25 0.05 0.05 19.50 0.05 0.05 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 112HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.96% Impervious, Inflow Depth > 1.75" for 25yr24hr event Inflow = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af Outflow = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.304 ac 1.34 cfs 1.34 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 113HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.01 0.01 11.50 0.03 0.03 11.75 0.06 0.06 12.00 0.16 0.16 12.25 0.58 0.58 12.50 1.23 1.23 12.75 1.27 1.27 13.00 0.91 0.91 13.25 0.62 0.62 13.50 0.45 0.45 13.75 0.36 0.36 14.00 0.31 0.31 14.25 0.27 0.27 14.50 0.24 0.24 14.75 0.22 0.22 15.00 0.21 0.21 15.25 0.20 0.20 15.50 0.18 0.18 15.75 0.17 0.17 16.00 0.16 0.16 16.25 0.15 0.15 16.50 0.13 0.13 16.75 0.13 0.13 17.00 0.12 0.12 17.25 0.11 0.11 17.50 0.11 0.11 17.75 0.10 0.10 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.09 0.09 18.50 0.08 0.08 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.08 0.08 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.07 0.07 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 114HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.77% Impervious, Inflow Depth > 1.46" for 25yr24hr event Inflow = 2.52 cfs @ 12.36 hrs, Volume= 0.279 af Outflow = 2.52 cfs @ 12.36 hrs, Volume= 0.279 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=2.297 ac 2.52 cfs 2.52 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 115HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.02 0.02 11.75 0.10 0.10 12.00 0.50 0.50 12.25 2.22 2.22 12.50 2.19 2.19 12.75 1.27 1.27 13.00 0.76 0.76 13.25 0.56 0.56 13.50 0.47 0.47 13.75 0.43 0.43 14.00 0.40 0.40 14.25 0.36 0.36 14.50 0.34 0.34 14.75 0.32 0.32 15.00 0.30 0.30 15.25 0.28 0.28 15.50 0.26 0.26 15.75 0.24 0.24 16.00 0.22 0.22 16.25 0.21 0.21 16.50 0.19 0.19 16.75 0.18 0.18 17.00 0.17 0.17 17.25 0.17 0.17 17.50 0.16 0.16 17.75 0.15 0.15 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.14 0.14 18.25 0.13 0.13 18.50 0.12 0.12 18.75 0.12 0.12 19.00 0.12 0.12 19.25 0.12 0.12 19.50 0.11 0.11 19.75 0.11 0.11 20.00 0.11 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 116HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 29.18% Impervious, Inflow Depth > 2.00" for 25yr24hr event Inflow = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af Outflow = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)3 2 1 0 Inflow Area=2.007 ac 3.16 cfs 3.16 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 117HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.03 0.03 11.00 0.06 0.06 11.25 0.09 0.09 11.50 0.15 0.15 11.75 0.27 0.27 12.00 0.85 0.85 12.25 2.88 2.88 12.50 2.64 2.64 12.75 1.49 1.49 13.00 0.87 0.87 13.25 0.63 0.63 13.50 0.52 0.52 13.75 0.47 0.47 14.00 0.43 0.43 14.25 0.39 0.39 14.50 0.36 0.36 14.75 0.34 0.34 15.00 0.32 0.32 15.25 0.30 0.30 15.50 0.28 0.28 15.75 0.26 0.26 16.00 0.24 0.24 16.25 0.22 0.22 16.50 0.20 0.20 16.75 0.19 0.19 17.00 0.18 0.18 17.25 0.17 0.17 17.50 0.16 0.16 17.75 0.15 0.15 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.14 0.14 18.25 0.14 0.14 18.50 0.13 0.13 18.75 0.13 0.13 19.00 0.12 0.12 19.25 0.12 0.12 19.50 0.12 0.12 19.75 0.11 0.11 20.00 0.11 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 118HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.87% Impervious, Inflow Depth > 1.76" for 25yr24hr event Inflow = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af Outflow = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.667 ac 2.39 cfs 2.39 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 119HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.02 0.02 11.25 0.04 0.04 11.50 0.08 0.08 11.75 0.18 0.18 12.00 0.64 0.64 12.25 2.30 2.30 12.50 1.85 1.85 12.75 0.98 0.98 13.00 0.60 0.60 13.25 0.45 0.45 13.50 0.39 0.39 13.75 0.35 0.35 14.00 0.32 0.32 14.25 0.29 0.29 14.50 0.27 0.27 14.75 0.26 0.26 15.00 0.24 0.24 15.25 0.23 0.23 15.50 0.21 0.21 15.75 0.20 0.20 16.00 0.18 0.18 16.25 0.17 0.17 16.50 0.16 0.16 16.75 0.15 0.15 17.00 0.14 0.14 17.25 0.13 0.13 17.50 0.13 0.13 17.75 0.12 0.12 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.11 0.11 18.25 0.10 0.10 18.50 0.10 0.10 18.75 0.10 0.10 19.00 0.10 0.10 19.25 0.09 0.09 19.50 0.09 0.09 19.75 0.09 0.09 20.00 0.09 0.09 Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 120HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 27.33% Impervious, Inflow Depth > 1.93" for 25yr24hr event Inflow = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af Outflow = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)6 5 4 3 2 1 0 Inflow Area=3.075 ac 5.48 cfs 5.48 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 121HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.04 0.04 11.00 0.08 0.08 11.25 0.14 0.14 11.50 0.24 0.24 11.75 0.55 0.55 12.00 1.88 1.88 12.25 5.39 5.39 12.50 3.18 3.18 12.75 1.50 1.50 13.00 1.02 1.02 13.25 0.81 0.81 13.50 0.73 0.73 13.75 0.67 0.67 14.00 0.61 0.61 14.25 0.56 0.56 14.50 0.53 0.53 14.75 0.50 0.50 15.00 0.47 0.47 15.25 0.44 0.44 15.50 0.40 0.40 15.75 0.37 0.37 16.00 0.34 0.34 16.25 0.31 0.31 16.50 0.30 0.30 16.75 0.28 0.28 17.00 0.27 0.27 17.25 0.25 0.25 17.50 0.24 0.24 17.75 0.22 0.22 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.21 0.21 18.25 0.20 0.20 18.50 0.19 0.19 18.75 0.19 0.19 19.00 0.18 0.18 19.25 0.18 0.18 19.50 0.17 0.17 19.75 0.17 0.17 20.00 0.17 0.17 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 122HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,521 sf 38.82% Impervious Runoff Depth>2.76"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=3.61 cfs 0.240 af Runoff Area=16,879 sf 55.38% Impervious Runoff Depth>3.88"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=1.33 cfs 0.125 af Runoff Area=44,946 sf 22.42% Impervious Runoff Depth>2.35"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=2.11 cfs 0.202 af Runoff Area=56,816 sf 31.96% Impervious Runoff Depth>2.71"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=2.12 cfs 0.295 af Runoff Area=100,078 sf 15.77% Impervious Runoff Depth>2.35"Subcatchment 5S: SC-5 Flow Length=279' Tc=22.7 min CN=57 Runoff=4.24 cfs 0.449 af Runoff Area=87,415 sf 29.18% Impervious Runoff Depth>3.04"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=4.86 cfs 0.508 af Runoff Area=72,602 sf 20.87% Impervious Runoff Depth>2.74"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=3.81 cfs 0.381 af Runoff Area=133,967 sf 27.33% Impervious Runoff Depth>2.95"Subcatchment 8S: SC-8 Flow Length=640' Tc=15.2 min CN=63 Runoff=8.54 cfs 0.755 af Inflow=3.61 cfs 0.240 afReach 1R: AP-1 Outflow=3.61 cfs 0.240 af Inflow=1.33 cfs 0.125 afReach 2R: AP-2 Outflow=1.33 cfs 0.125 af Inflow=2.11 cfs 0.202 afReach 3R: AP-3 Outflow=2.11 cfs 0.202 af Inflow=2.12 cfs 0.295 afReach 4R: AP-4 Outflow=2.12 cfs 0.295 af Inflow=4.24 cfs 0.449 afReach 5R: AP-5 Outflow=4.24 cfs 0.449 af Inflow=4.86 cfs 0.508 afReach 6R: AP-6 Outflow=4.86 cfs 0.508 af Inflow=3.81 cfs 0.381 afReach 7R: AP-7 Outflow=3.81 cfs 0.381 af Inflow=8.54 cfs 0.755 afReach 8R: AP-8 Outflow=8.54 cfs 0.755 af Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 123HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 2.956 af Average Runoff Depth = 2.77" 73.43% Pervious = 9.410 ac 26.57% Impervious = 3.405 ac Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 124HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af, Depth> 2.76" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description 11,160 36 Woods, Fair, HSG A 22,256 54 1/2 acre lots, 25% imp, HSG A 12,105 98 Paved parking, HSG A 45,521 61 Weighted Average 27,852 61.18% Pervious Area 17,669 38.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 125HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=45,521 sf Runoff Volume=0.240 af Runoff Depth>2.76" Flow Length=471' Tc=5.0 min CN=61 3.61 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 126HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.01 10.25 1.49 0.01 0.02 10.50 1.60 0.02 0.04 10.75 1.72 0.03 0.06 11.00 1.85 0.05 0.08 11.25 2.01 0.07 0.13 11.50 2.21 0.12 0.19 11.75 2.63 0.24 0.61 12.00 3.70 0.67 2.23 12.25 4.77 1.23 1.82 12.50 5.19 1.49 0.89 12.75 5.39 1.61 0.50 13.00 5.55 1.71 0.40 13.25 5.68 1.79 0.35 13.50 5.80 1.87 0.32 13.75 5.91 1.94 0.29 14.00 6.00 2.01 0.26 14.25 6.09 2.07 0.25 14.50 6.17 2.12 0.23 14.75 6.25 2.17 0.22 15.00 6.32 2.22 0.21 15.25 6.39 2.27 0.19 15.50 6.45 2.31 0.18 15.75 6.51 2.35 0.16 16.00 6.56 2.39 0.15 16.25 6.60 2.42 0.14 16.50 6.65 2.45 0.13 16.75 6.69 2.48 0.12 17.00 6.73 2.51 0.12 17.25 6.77 2.54 0.11 17.50 6.80 2.56 0.10 17.75 6.84 2.58 0.10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.09 18.25 6.90 2.63 0.09 18.50 6.93 2.65 0.09 18.75 6.95 2.67 0.08 19.00 6.98 2.69 0.08 19.25 7.01 2.71 0.08 19.50 7.03 2.73 0.08 19.75 7.06 2.74 0.08 20.00 7.08 2.76 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 127HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af, Depth> 3.88" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,352 54 1/2 acre lots, 25% imp, HSG A 7,259 98 Paved parking, HSG A 16,879 72 Weighted Average 7,532 44.62% Pervious Area 9,347 55.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Dev. Open Space Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=16,879 sf Runoff Volume=0.125 af Runoff Depth>3.88" Flow Length=316' Tc=18.0 min CN=72 1.33 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 128HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.01 0.00 8.75 1.01 0.01 0.01 9.00 1.08 0.02 0.01 9.25 1.15 0.03 0.01 9.50 1.23 0.05 0.02 9.75 1.31 0.06 0.02 10.00 1.40 0.09 0.03 10.25 1.49 0.11 0.04 10.50 1.60 0.14 0.04 10.75 1.72 0.18 0.06 11.00 1.85 0.23 0.07 11.25 2.01 0.29 0.08 11.50 2.21 0.38 0.11 11.75 2.63 0.60 0.20 12.00 3.70 1.25 0.52 12.25 4.77 2.02 1.33 12.50 5.19 2.35 0.82 12.75 5.39 2.51 0.39 13.00 5.55 2.63 0.24 13.25 5.68 2.73 0.18 13.50 5.80 2.83 0.16 13.75 5.91 2.92 0.14 14.00 6.00 2.99 0.13 14.25 6.09 3.07 0.12 14.50 6.17 3.13 0.11 14.75 6.25 3.20 0.10 15.00 6.32 3.26 0.10 15.25 6.39 3.31 0.09 15.50 6.45 3.36 0.08 15.75 6.51 3.41 0.08 16.00 6.56 3.45 0.07 16.25 6.60 3.49 0.06 16.50 6.65 3.53 0.06 16.75 6.69 3.57 0.06 17.00 6.73 3.60 0.05 17.25 6.77 3.63 0.05 17.50 6.80 3.66 0.05 17.75 6.84 3.69 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 3.72 0.04 18.25 6.90 3.74 0.04 18.50 6.93 3.77 0.04 18.75 6.95 3.79 0.04 19.00 6.98 3.81 0.04 19.25 7.01 3.83 0.04 19.50 7.03 3.86 0.03 19.75 7.06 3.88 0.03 20.00 7.08 3.90 0.03 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 129HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af, Depth> 2.35" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 17,792 36 * 17,075 54 * 10,079 98 44,946 57 Weighted Average 34,867 77.58% Pervious Area 10,079 22.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 130HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=44,946 sf Runoff Volume=0.202 af Runoff Depth>2.35" Flow Length=464' Tc=17.6 min CN=57 2.11 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 131HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.00 0.00 10.50 1.60 0.00 0.00 10.75 1.72 0.01 0.01 11.00 1.85 0.01 0.03 11.25 2.01 0.03 0.05 11.50 2.21 0.06 0.09 11.75 2.63 0.14 0.19 12.00 3.70 0.49 0.65 12.25 4.77 0.98 2.11 12.50 5.19 1.21 1.41 12.75 5.39 1.32 0.70 13.00 5.55 1.41 0.45 13.25 5.68 1.48 0.34 13.50 5.80 1.55 0.31 13.75 5.91 1.62 0.28 14.00 6.00 1.68 0.26 14.25 6.09 1.73 0.23 14.50 6.17 1.78 0.22 14.75 6.25 1.83 0.21 15.00 6.32 1.87 0.19 15.25 6.39 1.92 0.18 15.50 6.45 1.96 0.17 15.75 6.51 1.99 0.16 16.00 6.56 2.02 0.14 16.25 6.60 2.05 0.13 16.50 6.65 2.08 0.12 16.75 6.69 2.11 0.12 17.00 6.73 2.14 0.11 17.25 6.77 2.16 0.11 17.50 6.80 2.18 0.10 17.75 6.84 2.21 0.09 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.23 0.09 18.25 6.90 2.24 0.08 18.50 6.93 2.26 0.08 18.75 6.95 2.28 0.08 19.00 6.98 2.30 0.08 19.25 7.01 2.32 0.07 19.50 7.03 2.33 0.07 19.75 7.06 2.35 0.07 20.00 7.08 2.37 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 132HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af, Depth> 2.71" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 21,523 36 * 17,133 54 * 18,160 98 56,816 61 Weighted Average 38,656 68.04% Pervious Area 18,160 31.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 133HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=56,816 sf Runoff Volume=0.295 af Runoff Depth>2.71" Flow Length=679' Tc=42.9 min CN=61 2.12 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 134HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.01 0.00 10.50 1.60 0.02 0.01 10.75 1.72 0.03 0.03 11.00 1.85 0.05 0.05 11.25 2.01 0.07 0.07 11.50 2.21 0.12 0.10 11.75 2.63 0.24 0.16 12.00 3.70 0.67 0.34 12.25 4.77 1.23 1.03 12.50 5.19 1.49 2.00 12.75 5.39 1.61 1.99 13.00 5.55 1.71 1.39 13.25 5.68 1.79 0.93 13.50 5.80 1.87 0.67 13.75 5.91 1.94 0.53 14.00 6.00 2.01 0.45 14.25 6.09 2.07 0.39 14.50 6.17 2.12 0.35 14.75 6.25 2.17 0.32 15.00 6.32 2.22 0.30 15.25 6.39 2.27 0.28 15.50 6.45 2.31 0.26 15.75 6.51 2.35 0.24 16.00 6.56 2.39 0.23 16.25 6.60 2.42 0.21 16.50 6.65 2.45 0.19 16.75 6.69 2.48 0.18 17.00 6.73 2.51 0.17 17.25 6.77 2.54 0.16 17.50 6.80 2.56 0.15 17.75 6.84 2.58 0.14 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.13 18.25 6.90 2.63 0.13 18.50 6.93 2.65 0.12 18.75 6.95 2.67 0.11 19.00 6.98 2.69 0.11 19.25 7.01 2.71 0.11 19.50 7.03 2.73 0.10 19.75 7.06 2.74 0.10 20.00 7.08 2.76 0.10 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 135HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 4.24 cfs @ 12.34 hrs, Volume= 0.449 af, Depth> 2.35" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 20,622 36 * 63,670 54 * 15,786 98 100,078 57 Weighted Average 84,292 84.23% Pervious Area 15,786 15.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 1.7 169 0.0070 1.70 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 22.7 279 Total Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 136HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=100,078 sf Runoff Volume=0.449 af Runoff Depth>2.35" Flow Length=279' Tc=22.7 min CN=57 4.24 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 137HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.00 0.00 10.50 1.60 0.00 0.00 10.75 1.72 0.01 0.02 11.00 1.85 0.01 0.05 11.25 2.01 0.03 0.09 11.50 2.21 0.06 0.17 11.75 2.63 0.14 0.33 12.00 3.70 0.49 1.09 12.25 4.77 0.98 3.87 12.50 5.19 1.21 3.53 12.75 5.39 1.32 1.98 13.00 5.55 1.41 1.17 13.25 5.68 1.48 0.85 13.50 5.80 1.55 0.71 13.75 5.91 1.62 0.64 14.00 6.00 1.68 0.59 14.25 6.09 1.73 0.54 14.50 6.17 1.78 0.50 14.75 6.25 1.83 0.47 15.00 6.32 1.87 0.44 15.25 6.39 1.92 0.41 15.50 6.45 1.96 0.39 15.75 6.51 1.99 0.36 16.00 6.56 2.02 0.33 16.25 6.60 2.05 0.30 16.50 6.65 2.08 0.28 16.75 6.69 2.11 0.27 17.00 6.73 2.14 0.25 17.25 6.77 2.16 0.24 17.50 6.80 2.18 0.23 17.75 6.84 2.21 0.21 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.23 0.20 18.25 6.90 2.24 0.19 18.50 6.93 2.26 0.18 18.75 6.95 2.28 0.17 19.00 6.98 2.30 0.17 19.25 7.01 2.32 0.17 19.50 7.03 2.33 0.16 19.75 7.06 2.35 0.16 20.00 7.08 2.37 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 138HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af, Depth> 3.04" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 14,490 36 * 47,419 54 * 25,506 98 87,415 64 Weighted Average 61,909 70.82% Pervious Area 25,506 29.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)5 4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=87,415 sf Runoff Volume=0.508 af Runoff Depth>3.04" Flow Length=520' Tc=23.1 min CN=64 4.86 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 139HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.01 0.02 10.00 1.40 0.01 0.04 10.25 1.49 0.02 0.06 10.50 1.60 0.04 0.09 10.75 1.72 0.06 0.12 11.00 1.85 0.08 0.16 11.25 2.01 0.12 0.22 11.50 2.21 0.17 0.32 11.75 2.63 0.32 0.53 12.00 3.70 0.81 1.48 12.25 4.77 1.43 4.51 12.50 5.19 1.71 3.96 12.75 5.39 1.84 2.18 13.00 5.55 1.95 1.25 13.25 5.68 2.04 0.89 13.50 5.80 2.12 0.74 13.75 5.91 2.20 0.67 14.00 6.00 2.26 0.61 14.25 6.09 2.33 0.55 14.50 6.17 2.39 0.51 14.75 6.25 2.44 0.48 15.00 6.32 2.50 0.45 15.25 6.39 2.54 0.42 15.50 6.45 2.59 0.39 15.75 6.51 2.63 0.36 16.00 6.56 2.67 0.33 16.25 6.60 2.70 0.30 16.50 6.65 2.74 0.28 16.75 6.69 2.77 0.27 17.00 6.73 2.80 0.25 17.25 6.77 2.83 0.24 17.50 6.80 2.85 0.23 17.75 6.84 2.88 0.21 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.90 0.20 18.25 6.90 2.92 0.19 18.50 6.93 2.94 0.18 18.75 6.95 2.97 0.17 19.00 6.98 2.99 0.17 19.25 7.01 3.01 0.17 19.50 7.03 3.03 0.16 19.75 7.06 3.05 0.16 20.00 7.08 3.06 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 140HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af, Depth> 2.74" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 7,170 36 * 50,283 54 * 15,149 98 72,602 61 Weighted Average 57,453 79.13% Pervious Area 15,149 20.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 141HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=72,602 sf Runoff Volume=0.381 af Runoff Depth>2.74" Flow Length=248' Tc=20.4 min CN=61 3.81 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 142HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.01 0.02 10.50 1.60 0.02 0.04 10.75 1.72 0.03 0.06 11.00 1.85 0.05 0.10 11.25 2.01 0.07 0.14 11.50 2.21 0.12 0.21 11.75 2.63 0.24 0.39 12.00 3.70 0.67 1.18 12.25 4.77 1.23 3.71 12.50 5.19 1.49 2.83 12.75 5.39 1.61 1.47 13.00 5.55 1.71 0.88 13.25 5.68 1.79 0.65 13.50 5.80 1.87 0.56 13.75 5.91 1.94 0.51 14.00 6.00 2.01 0.47 14.25 6.09 2.07 0.42 14.50 6.17 2.12 0.39 14.75 6.25 2.17 0.37 15.00 6.32 2.22 0.35 15.25 6.39 2.27 0.33 15.50 6.45 2.31 0.30 15.75 6.51 2.35 0.28 16.00 6.56 2.39 0.26 16.25 6.60 2.42 0.23 16.50 6.65 2.45 0.22 16.75 6.69 2.48 0.21 17.00 6.73 2.51 0.20 17.25 6.77 2.54 0.19 17.50 6.80 2.56 0.18 17.75 6.84 2.58 0.17 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.16 18.25 6.90 2.63 0.15 18.50 6.93 2.65 0.14 18.75 6.95 2.67 0.14 19.00 6.98 2.69 0.13 19.25 7.01 2.71 0.13 19.50 7.03 2.73 0.13 19.75 7.06 2.74 0.12 20.00 7.08 2.76 0.12 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 143HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af, Depth> 2.95" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 19,053 36 * 78,305 54 * 36,609 98 133,967 63 Weighted Average 97,358 72.67% Pervious Area 36,609 27.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 408 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 640 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=133,967 sf Runoff Volume=0.755 af Runoff Depth>2.95" Flow Length=640' Tc=15.2 min CN=63 8.54 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 144HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.02 10.00 1.40 0.01 0.05 10.25 1.49 0.02 0.09 10.50 1.60 0.03 0.13 10.75 1.72 0.05 0.19 11.00 1.85 0.07 0.26 11.25 2.01 0.10 0.35 11.50 2.21 0.15 0.53 11.75 2.63 0.29 1.08 12.00 3.70 0.76 3.22 12.25 4.77 1.37 8.32 12.50 5.19 1.63 4.71 12.75 5.39 1.76 2.18 13.00 5.55 1.87 1.47 13.25 5.68 1.96 1.16 13.50 5.80 2.04 1.04 13.75 5.91 2.11 0.96 14.00 6.00 2.18 0.87 14.25 6.09 2.24 0.79 14.50 6.17 2.30 0.74 14.75 6.25 2.35 0.70 15.00 6.32 2.40 0.66 15.25 6.39 2.45 0.61 15.50 6.45 2.50 0.57 15.75 6.51 2.54 0.52 16.00 6.56 2.57 0.48 16.25 6.60 2.61 0.44 16.50 6.65 2.64 0.41 16.75 6.69 2.67 0.39 17.00 6.73 2.70 0.37 17.25 6.77 2.73 0.35 17.50 6.80 2.75 0.33 17.75 6.84 2.78 0.31 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.80 0.29 18.25 6.90 2.82 0.27 18.50 6.93 2.84 0.27 18.75 6.95 2.87 0.26 19.00 6.98 2.89 0.25 19.25 7.01 2.91 0.25 19.50 7.03 2.93 0.24 19.75 7.06 2.94 0.24 20.00 7.08 2.96 0.23 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 145HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.82% Impervious, Inflow Depth > 2.76" for 100yr24hr event Inflow = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af Outflow = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=1.045 ac 3.61 cfs 3.61 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 146HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.01 0.01 10.25 0.02 0.02 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.08 0.08 11.25 0.13 0.13 11.50 0.19 0.19 11.75 0.61 0.61 12.00 2.23 2.23 12.25 1.82 1.82 12.50 0.89 0.89 12.75 0.50 0.50 13.00 0.40 0.40 13.25 0.35 0.35 13.50 0.32 0.32 13.75 0.29 0.29 14.00 0.26 0.26 14.25 0.25 0.25 14.50 0.23 0.23 14.75 0.22 0.22 15.00 0.21 0.21 15.25 0.19 0.19 15.50 0.18 0.18 15.75 0.16 0.16 16.00 0.15 0.15 16.25 0.14 0.14 16.50 0.13 0.13 16.75 0.12 0.12 17.00 0.12 0.12 17.25 0.11 0.11 17.50 0.10 0.10 17.75 0.10 0.10 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.09 0.09 18.50 0.09 0.09 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.08 0.08 19.50 0.08 0.08 19.75 0.08 0.08 20.00 0.07 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 147HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.38% Impervious, Inflow Depth > 3.88" for 100yr24hr event Inflow = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af Outflow = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=0.387 ac 1.33 cfs 1.33 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 148HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.01 0.01 9.00 0.01 0.01 9.25 0.01 0.01 9.50 0.02 0.02 9.75 0.02 0.02 10.00 0.03 0.03 10.25 0.04 0.04 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.07 0.07 11.25 0.08 0.08 11.50 0.11 0.11 11.75 0.20 0.20 12.00 0.52 0.52 12.25 1.33 1.33 12.50 0.82 0.82 12.75 0.39 0.39 13.00 0.24 0.24 13.25 0.18 0.18 13.50 0.16 0.16 13.75 0.14 0.14 14.00 0.13 0.13 14.25 0.12 0.12 14.50 0.11 0.11 14.75 0.10 0.10 15.00 0.10 0.10 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.05 0.05 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 149HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.42% Impervious, Inflow Depth > 2.35" for 100yr24hr event Inflow = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af Outflow = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.032 ac 2.11 cfs 2.11 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 150HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.01 0.01 11.00 0.03 0.03 11.25 0.05 0.05 11.50 0.09 0.09 11.75 0.19 0.19 12.00 0.65 0.65 12.25 2.11 2.11 12.50 1.41 1.41 12.75 0.70 0.70 13.00 0.45 0.45 13.25 0.34 0.34 13.50 0.31 0.31 13.75 0.28 0.28 14.00 0.26 0.26 14.25 0.23 0.23 14.50 0.22 0.22 14.75 0.21 0.21 15.00 0.19 0.19 15.25 0.18 0.18 15.50 0.17 0.17 15.75 0.16 0.16 16.00 0.14 0.14 16.25 0.13 0.13 16.50 0.12 0.12 16.75 0.12 0.12 17.00 0.11 0.11 17.25 0.11 0.11 17.50 0.10 0.10 17.75 0.09 0.09 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.08 0.08 18.50 0.08 0.08 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.07 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 151HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.96% Impervious, Inflow Depth > 2.71" for 100yr24hr event Inflow = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af Outflow = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.304 ac 2.12 cfs 2.12 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 152HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.03 0.03 11.00 0.05 0.05 11.25 0.07 0.07 11.50 0.10 0.10 11.75 0.16 0.16 12.00 0.34 0.34 12.25 1.03 1.03 12.50 2.00 2.00 12.75 1.99 1.99 13.00 1.39 1.39 13.25 0.93 0.93 13.50 0.67 0.67 13.75 0.53 0.53 14.00 0.45 0.45 14.25 0.39 0.39 14.50 0.35 0.35 14.75 0.32 0.32 15.00 0.30 0.30 15.25 0.28 0.28 15.50 0.26 0.26 15.75 0.24 0.24 16.00 0.23 0.23 16.25 0.21 0.21 16.50 0.19 0.19 16.75 0.18 0.18 17.00 0.17 0.17 17.25 0.16 0.16 17.50 0.15 0.15 17.75 0.14 0.14 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.13 0.13 18.25 0.13 0.13 18.50 0.12 0.12 18.75 0.11 0.11 19.00 0.11 0.11 19.25 0.11 0.11 19.50 0.10 0.10 19.75 0.10 0.10 20.00 0.10 0.10 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 153HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.77% Impervious, Inflow Depth > 2.35" for 100yr24hr event Inflow = 4.24 cfs @ 12.34 hrs, Volume= 0.449 af Outflow = 4.24 cfs @ 12.34 hrs, Volume= 0.449 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=2.297 ac 4.24 cfs 4.24 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 154HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.02 0.02 11.00 0.05 0.05 11.25 0.09 0.09 11.50 0.17 0.17 11.75 0.33 0.33 12.00 1.09 1.09 12.25 3.87 3.87 12.50 3.53 3.53 12.75 1.98 1.98 13.00 1.17 1.17 13.25 0.85 0.85 13.50 0.71 0.71 13.75 0.64 0.64 14.00 0.59 0.59 14.25 0.54 0.54 14.50 0.50 0.50 14.75 0.47 0.47 15.00 0.44 0.44 15.25 0.41 0.41 15.50 0.39 0.39 15.75 0.36 0.36 16.00 0.33 0.33 16.25 0.30 0.30 16.50 0.28 0.28 16.75 0.27 0.27 17.00 0.25 0.25 17.25 0.24 0.24 17.50 0.23 0.23 17.75 0.21 0.21 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.20 0.20 18.25 0.19 0.19 18.50 0.18 0.18 18.75 0.17 0.17 19.00 0.17 0.17 19.25 0.17 0.17 19.50 0.16 0.16 19.75 0.16 0.16 20.00 0.15 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 155HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 29.18% Impervious, Inflow Depth > 3.04" for 100yr24hr event Inflow = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af Outflow = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)5 4 3 2 1 0 Inflow Area=2.007 ac 4.86 cfs 4.86 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 156HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.02 0.02 10.00 0.04 0.04 10.25 0.06 0.06 10.50 0.09 0.09 10.75 0.12 0.12 11.00 0.16 0.16 11.25 0.22 0.22 11.50 0.32 0.32 11.75 0.53 0.53 12.00 1.48 1.48 12.25 4.51 4.51 12.50 3.96 3.96 12.75 2.18 2.18 13.00 1.25 1.25 13.25 0.89 0.89 13.50 0.74 0.74 13.75 0.67 0.67 14.00 0.61 0.61 14.25 0.55 0.55 14.50 0.51 0.51 14.75 0.48 0.48 15.00 0.45 0.45 15.25 0.42 0.42 15.50 0.39 0.39 15.75 0.36 0.36 16.00 0.33 0.33 16.25 0.30 0.30 16.50 0.28 0.28 16.75 0.27 0.27 17.00 0.25 0.25 17.25 0.24 0.24 17.50 0.23 0.23 17.75 0.21 0.21 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.20 0.20 18.25 0.19 0.19 18.50 0.18 0.18 18.75 0.17 0.17 19.00 0.17 0.17 19.25 0.17 0.17 19.50 0.16 0.16 19.75 0.16 0.16 20.00 0.15 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 157HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.87% Impervious, Inflow Depth > 2.74" for 100yr24hr event Inflow = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af Outflow = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=1.667 ac 3.81 cfs 3.81 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 158HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.02 0.02 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.10 0.10 11.25 0.14 0.14 11.50 0.21 0.21 11.75 0.39 0.39 12.00 1.18 1.18 12.25 3.71 3.71 12.50 2.83 2.83 12.75 1.47 1.47 13.00 0.88 0.88 13.25 0.65 0.65 13.50 0.56 0.56 13.75 0.51 0.51 14.00 0.47 0.47 14.25 0.42 0.42 14.50 0.39 0.39 14.75 0.37 0.37 15.00 0.35 0.35 15.25 0.33 0.33 15.50 0.30 0.30 15.75 0.28 0.28 16.00 0.26 0.26 16.25 0.23 0.23 16.50 0.22 0.22 16.75 0.21 0.21 17.00 0.20 0.20 17.25 0.19 0.19 17.50 0.18 0.18 17.75 0.17 0.17 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.16 0.16 18.25 0.15 0.15 18.50 0.14 0.14 18.75 0.14 0.14 19.00 0.13 0.13 19.25 0.13 0.13 19.50 0.13 0.13 19.75 0.12 0.12 20.00 0.12 0.12 Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 159HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 27.33% Impervious, Inflow Depth > 2.95" for 100yr24hr event Inflow = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af Outflow = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=3.075 ac 8.54 cfs 8.54 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Existing_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 160HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.02 0.02 10.00 0.05 0.05 10.25 0.09 0.09 10.50 0.13 0.13 10.75 0.19 0.19 11.00 0.26 0.26 11.25 0.35 0.35 11.50 0.53 0.53 11.75 1.08 1.08 12.00 3.22 3.22 12.25 8.32 8.32 12.50 4.71 4.71 12.75 2.18 2.18 13.00 1.47 1.47 13.25 1.16 1.16 13.50 1.04 1.04 13.75 0.96 0.96 14.00 0.87 0.87 14.25 0.79 0.79 14.50 0.74 0.74 14.75 0.70 0.70 15.00 0.66 0.66 15.25 0.61 0.61 15.50 0.57 0.57 15.75 0.52 0.52 16.00 0.48 0.48 16.25 0.44 0.44 16.50 0.41 0.41 16.75 0.39 0.39 17.00 0.37 0.37 17.25 0.35 0.35 17.50 0.33 0.33 17.75 0.31 0.31 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.29 0.29 18.25 0.27 0.27 18.50 0.27 0.27 18.75 0.26 0.26 19.00 0.25 0.25 19.25 0.25 0.25 19.50 0.24 0.24 19.75 0.24 0.24 20.00 0.23 0.23 ATTACHMENT 6 PROPOSED MODEL REPORT 1S SC-1 2S SC-2 3S SC-3 4S SC-4 5S SC-5 6S SC-6 7S SC-7 8S SC-8 1R AP-1 2R AP-2 3R AP-3 4R AP-4 5R AP-5 6R AP-6 7R AP-7 8R AP-8 Routing Diagram for Proposed_GosnoldSt Prepared by Apex Companies, Printed 1/12/2024 HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 2HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 2yr24hr Type III 24-hr Default 24.00 1 3.39 2 2 10yr24hr Type III 24-hr Default 24.00 1 4.94 2 3 25yr24hr Type III 24-hr Default 24.00 1 5.91 2 4 100yr24hr Type III 24-hr Default 24.00 1 7.40 2 Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 3HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 2.320 36 (3S, 4S, 5S, 6S, 7S, 8S) 6.327 54 (3S, 4S, 5S, 6S, 7S, 8S) 2.736 98 (3S, 4S, 5S, 6S, 7S, 8S) 0.704 54 1/2 acre lots, 25% imp, HSG A (1S, 2S) 0.443 98 Paved parking, HSG A (1S, 2S) 0.285 36 Woods, Fair, HSG A (1S, 2S) 12.815 61 TOTAL AREA Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 4HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 11.383 11.383 3S, 4S, 5S, 6S, 7S, 8S 0.704 0.000 0.000 0.000 0.000 0.704 1/2 acre lots, 25% imp 1S, 2S 0.443 0.000 0.000 0.000 0.000 0.443 Paved parking 1S, 2S 0.285 0.000 0.000 0.000 0.000 0.285 Woods, Fair 1S, 2S 1.433 0.000 0.000 0.000 11.383 12.815 TOTAL AREA Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 5HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,522 sf 38.62% Impervious Runoff Depth>0.46"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=0.45 cfs 0.040 af Runoff Area=16,878 sf 55.62% Impervious Runoff Depth>0.95"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.31 cfs 0.031 af Runoff Area=44,946 sf 22.46% Impervious Runoff Depth>0.32"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=0.18 cfs 0.028 af Runoff Area=56,816 sf 31.30% Impervious Runoff Depth>0.45"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=0.28 cfs 0.049 af Runoff Area=100,078 sf 15.34% Impervious Runoff Depth>0.32"Subcatchment 5S: SC-5 Flow Length=315' Tc=23.4 min CN=57 Runoff=0.37 cfs 0.061 af Runoff Area=87,415 sf 28.71% Impervious Runoff Depth>0.57"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=0.77 cfs 0.096 af Runoff Area=72,600 sf 20.56% Impervious Runoff Depth>0.46"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=0.48 cfs 0.063 af Runoff Area=133,967 sf 26.81% Impervious Runoff Depth>0.54"Subcatchment 8S: SC-8 Flow Length=632' Tc=15.2 min CN=63 Runoff=1.24 cfs 0.137 af Inflow=0.45 cfs 0.040 afReach 1R: AP-1 Outflow=0.45 cfs 0.040 af Inflow=0.31 cfs 0.031 afReach 2R: AP-2 Outflow=0.31 cfs 0.031 af Inflow=0.18 cfs 0.028 afReach 3R: AP-3 Outflow=0.18 cfs 0.028 af Inflow=0.28 cfs 0.049 afReach 4R: AP-4 Outflow=0.28 cfs 0.049 af Inflow=0.37 cfs 0.061 afReach 5R: AP-5 Outflow=0.37 cfs 0.061 af Inflow=0.77 cfs 0.096 afReach 6R: AP-6 Outflow=0.77 cfs 0.096 af Inflow=0.48 cfs 0.063 afReach 7R: AP-7 Outflow=0.48 cfs 0.063 af Inflow=1.24 cfs 0.137 afReach 8R: AP-8 Outflow=1.24 cfs 0.137 af Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 6HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 0.505 af Average Runoff Depth = 0.47" 73.82% Pervious = 9.460 ac 26.18% Impervious = 3.355 ac Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 7HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af, Depth> 0.46" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description 11,163 36 Woods, Fair, HSG A 22,370 54 1/2 acre lots, 25% imp, HSG A 11,989 98 Paved parking, HSG A 45,522 61 Weighted Average 27,941 61.38% Pervious Area 17,582 38.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 8HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=45,522 sf Runoff Volume=0.040 af Runoff Depth>0.46" Flow Length=471' Tc=5.0 min CN=61 0.45 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 9HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.15 12.25 2.19 0.11 0.31 12.50 2.38 0.16 0.18 12.75 2.47 0.19 0.10 13.00 2.54 0.21 0.09 13.25 2.60 0.23 0.08 13.50 2.66 0.24 0.07 13.75 2.71 0.26 0.07 14.00 2.75 0.28 0.06 14.25 2.79 0.29 0.06 14.50 2.83 0.30 0.06 14.75 2.86 0.31 0.05 15.00 2.90 0.33 0.05 15.25 2.93 0.34 0.05 15.50 2.95 0.35 0.04 15.75 2.98 0.36 0.04 16.00 3.00 0.37 0.04 16.25 3.03 0.37 0.03 16.50 3.05 0.38 0.03 16.75 3.06 0.39 0.03 17.00 3.08 0.40 0.03 17.25 3.10 0.40 0.03 17.50 3.12 0.41 0.03 17.75 3.13 0.42 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.02 18.25 3.16 0.43 0.02 18.50 3.17 0.43 0.02 18.75 3.19 0.44 0.02 19.00 3.20 0.44 0.02 19.25 3.21 0.45 0.02 19.50 3.22 0.45 0.02 19.75 3.23 0.46 0.02 20.00 3.24 0.46 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 10HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af, Depth> 0.95" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,297 54 1/2 acre lots, 25% imp, HSG A 7,313 98 Paved parking, HSG A 16,878 72 Weighted Average 7,491 44.38% Pervious Area 9,387 55.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=16,878 sf Runoff Volume=0.031 af Runoff Depth>0.95" Flow Length=316' Tc=18.0 min CN=72 0.31 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 11HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.01 0.01 11.75 1.20 0.04 0.02 12.00 1.69 0.18 0.09 12.25 2.19 0.37 0.31 12.50 2.38 0.47 0.22 12.75 2.47 0.51 0.11 13.00 2.54 0.55 0.07 13.25 2.60 0.58 0.05 13.50 2.66 0.61 0.05 13.75 2.71 0.64 0.04 14.00 2.75 0.66 0.04 14.25 2.79 0.69 0.04 14.50 2.83 0.71 0.03 14.75 2.86 0.73 0.03 15.00 2.90 0.75 0.03 15.25 2.93 0.76 0.03 15.50 2.95 0.78 0.03 15.75 2.98 0.80 0.02 16.00 3.00 0.81 0.02 16.25 3.03 0.82 0.02 16.50 3.05 0.84 0.02 16.75 3.06 0.85 0.02 17.00 3.08 0.86 0.02 17.25 3.10 0.87 0.02 17.50 3.12 0.88 0.02 17.75 3.13 0.89 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.90 0.01 18.25 3.16 0.90 0.01 18.50 3.17 0.91 0.01 18.75 3.19 0.92 0.01 19.00 3.20 0.93 0.01 19.25 3.21 0.94 0.01 19.50 3.22 0.94 0.01 19.75 3.23 0.95 0.01 20.00 3.24 0.96 0.01 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 12HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af, Depth> 0.32" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 17,794 36 * 17,056 54 * 10,096 98 44,946 57 Weighted Average 34,850 77.54% Pervious Area 10,096 22.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 13HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=44,946 sf Runoff Volume=0.028 af Runoff Depth>0.32" Flow Length=464' Tc=17.6 min CN=57 0.18 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 14HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.00 0.00 12.25 2.19 0.06 0.13 12.50 2.38 0.09 0.17 12.75 2.47 0.11 0.11 13.00 2.54 0.12 0.08 13.25 2.60 0.14 0.06 13.50 2.66 0.15 0.06 13.75 2.71 0.16 0.05 14.00 2.75 0.18 0.05 14.25 2.79 0.19 0.05 14.50 2.83 0.20 0.04 14.75 2.86 0.21 0.04 15.00 2.90 0.22 0.04 15.25 2.93 0.22 0.04 15.50 2.95 0.23 0.04 15.75 2.98 0.24 0.03 16.00 3.00 0.25 0.03 16.25 3.03 0.25 0.03 16.50 3.05 0.26 0.03 16.75 3.06 0.27 0.03 17.00 3.08 0.27 0.02 17.25 3.10 0.28 0.02 17.50 3.12 0.28 0.02 17.75 3.13 0.29 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.29 0.02 18.25 3.16 0.30 0.02 18.50 3.17 0.30 0.02 18.75 3.19 0.30 0.02 19.00 3.20 0.31 0.02 19.25 3.21 0.31 0.02 19.50 3.22 0.32 0.02 19.75 3.23 0.32 0.02 20.00 3.24 0.32 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 15HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af, Depth> 0.45" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 21,624 36 * 17,411 54 * 17,781 98 56,816 61 Weighted Average 39,035 68.70% Pervious Area 17,781 31.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 16HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=56,816 sf Runoff Volume=0.049 af Runoff Depth>0.45" Flow Length=679' Tc=42.9 min CN=61 0.28 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 17HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.00 12.25 2.19 0.11 0.05 12.50 2.38 0.16 0.21 12.75 2.47 0.19 0.28 13.00 2.54 0.21 0.23 13.25 2.60 0.23 0.17 13.50 2.66 0.24 0.13 13.75 2.71 0.26 0.11 14.00 2.75 0.28 0.10 14.25 2.79 0.29 0.09 14.50 2.83 0.30 0.08 14.75 2.86 0.31 0.07 15.00 2.90 0.33 0.07 15.25 2.93 0.34 0.07 15.50 2.95 0.35 0.06 15.75 2.98 0.36 0.06 16.00 3.00 0.37 0.06 16.25 3.03 0.37 0.05 16.50 3.05 0.38 0.05 16.75 3.06 0.39 0.04 17.00 3.08 0.40 0.04 17.25 3.10 0.40 0.04 17.50 3.12 0.41 0.04 17.75 3.13 0.42 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.03 18.25 3.16 0.43 0.03 18.50 3.17 0.43 0.03 18.75 3.19 0.44 0.03 19.00 3.20 0.44 0.03 19.25 3.21 0.45 0.03 19.50 3.22 0.45 0.03 19.75 3.23 0.46 0.03 20.00 3.24 0.46 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 18HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 0.37 cfs @ 12.52 hrs, Volume= 0.061 af, Depth> 0.32" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 20,625 36 * 64,101 54 * 15,352 98 100,078 57 Weighted Average 84,726 84.66% Pervious Area 15,352 15.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 2.4 205 0.0050 1.44 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.4 315 Total Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 19HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=100,078 sf Runoff Volume=0.061 af Runoff Depth>0.32" Flow Length=315' Tc=23.4 min CN=57 0.37 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 20HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.00 0.00 12.25 2.19 0.06 0.17 12.50 2.38 0.09 0.37 12.75 2.47 0.11 0.28 13.00 2.54 0.12 0.19 13.25 2.60 0.14 0.15 13.50 2.66 0.15 0.13 13.75 2.71 0.16 0.12 14.00 2.75 0.18 0.11 14.25 2.79 0.19 0.11 14.50 2.83 0.20 0.10 14.75 2.86 0.21 0.10 15.00 2.90 0.22 0.09 15.25 2.93 0.22 0.09 15.50 2.95 0.23 0.08 15.75 2.98 0.24 0.08 16.00 3.00 0.25 0.07 16.25 3.03 0.25 0.06 16.50 3.05 0.26 0.06 16.75 3.06 0.27 0.06 17.00 3.08 0.27 0.06 17.25 3.10 0.28 0.05 17.50 3.12 0.28 0.05 17.75 3.13 0.29 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.29 0.04 18.25 3.16 0.30 0.04 18.50 3.17 0.30 0.04 18.75 3.19 0.30 0.04 19.00 3.20 0.31 0.04 19.25 3.21 0.31 0.04 19.50 3.22 0.32 0.04 19.75 3.23 0.32 0.04 20.00 3.24 0.32 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 21HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af, Depth> 0.57" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 14,520 36 * 47,798 54 * 25,097 98 87,415 64 Weighted Average 62,318 71.29% Pervious Area 25,097 28.71% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=87,415 sf Runoff Volume=0.096 af Runoff Depth>0.57" Flow Length=520' Tc=23.1 min CN=64 0.77 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 22HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.05 0.05 12.25 2.19 0.17 0.60 12.50 2.38 0.23 0.72 12.75 2.47 0.26 0.45 13.00 2.54 0.29 0.28 13.25 2.60 0.31 0.21 13.50 2.66 0.33 0.18 13.75 2.71 0.35 0.17 14.00 2.75 0.36 0.15 14.25 2.79 0.38 0.14 14.50 2.83 0.40 0.13 14.75 2.86 0.41 0.12 15.00 2.90 0.42 0.12 15.25 2.93 0.44 0.11 15.50 2.95 0.45 0.10 15.75 2.98 0.46 0.10 16.00 3.00 0.47 0.09 16.25 3.03 0.48 0.08 16.50 3.05 0.49 0.08 16.75 3.06 0.50 0.07 17.00 3.08 0.51 0.07 17.25 3.10 0.51 0.07 17.50 3.12 0.52 0.06 17.75 3.13 0.53 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.53 0.06 18.25 3.16 0.54 0.05 18.50 3.17 0.55 0.05 18.75 3.19 0.55 0.05 19.00 3.20 0.56 0.05 19.25 3.21 0.56 0.05 19.50 3.22 0.57 0.05 19.75 3.23 0.57 0.04 20.00 3.24 0.58 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 23HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af, Depth> 0.46" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 7,201 36 * 50,476 54 * 14,923 98 72,600 61 Weighted Average 57,677 79.44% Pervious Area 14,923 20.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 24HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=72,600 sf Runoff Volume=0.063 af Runoff Depth>0.46" Flow Length=248' Tc=20.4 min CN=61 0.48 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 25HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.03 0.01 12.25 2.19 0.11 0.39 12.50 2.38 0.16 0.45 12.75 2.47 0.19 0.27 13.00 2.54 0.21 0.18 13.25 2.60 0.23 0.14 13.50 2.66 0.24 0.12 13.75 2.71 0.26 0.11 14.00 2.75 0.28 0.11 14.25 2.79 0.29 0.10 14.50 2.83 0.30 0.09 14.75 2.86 0.31 0.09 15.00 2.90 0.33 0.08 15.25 2.93 0.34 0.08 15.50 2.95 0.35 0.07 15.75 2.98 0.36 0.07 16.00 3.00 0.37 0.06 16.25 3.03 0.37 0.06 16.50 3.05 0.38 0.05 16.75 3.06 0.39 0.05 17.00 3.08 0.40 0.05 17.25 3.10 0.40 0.05 17.50 3.12 0.41 0.05 17.75 3.13 0.42 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.42 0.04 18.25 3.16 0.43 0.04 18.50 3.17 0.43 0.04 18.75 3.19 0.44 0.04 19.00 3.20 0.44 0.03 19.25 3.21 0.45 0.03 19.50 3.22 0.45 0.03 19.75 3.23 0.46 0.03 20.00 3.24 0.46 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 26HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af, Depth> 0.54" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2yr24hr Rainfall=3.39" Area (sf) CN Description * 19,294 36 * 78,756 54 * 35,917 98 133,967 63 Weighted Average 98,050 73.19% Pervious Area 35,917 26.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 400 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 632 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 2yr24hr Rainfall=3.39" Runoff Area=133,967 sf Runoff Volume=0.137 af Runoff Depth>0.54" Flow Length=632' Tc=15.2 min CN=63 1.24 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 27HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.31 0.00 0.00 7.25 0.33 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.36 0.00 0.00 8.00 0.39 0.00 0.00 8.25 0.41 0.00 0.00 8.50 0.44 0.00 0.00 8.75 0.46 0.00 0.00 9.00 0.49 0.00 0.00 9.25 0.53 0.00 0.00 9.50 0.56 0.00 0.00 9.75 0.60 0.00 0.00 10.00 0.64 0.00 0.00 10.25 0.68 0.00 0.00 10.50 0.73 0.00 0.00 10.75 0.79 0.00 0.00 11.00 0.85 0.00 0.00 11.25 0.92 0.00 0.00 11.50 1.01 0.00 0.00 11.75 1.20 0.00 0.00 12.00 1.69 0.04 0.14 12.25 2.19 0.15 1.23 12.50 2.38 0.21 0.92 12.75 2.47 0.23 0.47 13.00 2.54 0.26 0.33 13.25 2.60 0.28 0.27 13.50 2.66 0.30 0.25 13.75 2.71 0.32 0.23 14.00 2.75 0.33 0.21 14.25 2.79 0.35 0.20 14.50 2.83 0.36 0.19 14.75 2.86 0.38 0.18 15.00 2.90 0.39 0.17 15.25 2.93 0.40 0.16 15.50 2.95 0.41 0.15 15.75 2.98 0.42 0.14 16.00 3.00 0.43 0.13 16.25 3.03 0.44 0.12 16.50 3.05 0.45 0.11 16.75 3.06 0.46 0.10 17.00 3.08 0.47 0.10 17.25 3.10 0.48 0.09 17.50 3.12 0.48 0.09 17.75 3.13 0.49 0.08 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 3.15 0.50 0.08 18.25 3.16 0.50 0.07 18.50 3.17 0.51 0.07 18.75 3.19 0.51 0.07 19.00 3.20 0.52 0.07 19.25 3.21 0.52 0.07 19.50 3.22 0.53 0.07 19.75 3.23 0.53 0.06 20.00 3.24 0.54 0.06 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 28HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.62% Impervious, Inflow Depth > 0.46" for 2yr24hr event Inflow = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af Outflow = 0.45 cfs @ 12.11 hrs, Volume= 0.040 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.045 ac 0.45 cfs 0.45 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 29HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.15 0.15 12.25 0.31 0.31 12.50 0.18 0.18 12.75 0.10 0.10 13.00 0.09 0.09 13.25 0.08 0.08 13.50 0.07 0.07 13.75 0.07 0.07 14.00 0.06 0.06 14.25 0.06 0.06 14.50 0.06 0.06 14.75 0.05 0.05 15.00 0.05 0.05 15.25 0.05 0.05 15.50 0.04 0.04 15.75 0.04 0.04 16.00 0.04 0.04 16.25 0.03 0.03 16.50 0.03 0.03 16.75 0.03 0.03 17.00 0.03 0.03 17.25 0.03 0.03 17.50 0.03 0.03 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 30HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.62% Impervious, Inflow Depth > 0.95" for 2yr24hr event Inflow = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af Outflow = 0.31 cfs @ 12.27 hrs, Volume= 0.031 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.387 ac 0.31 cfs 0.31 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 31HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.02 0.02 12.00 0.09 0.09 12.25 0.31 0.31 12.50 0.22 0.22 12.75 0.11 0.11 13.00 0.07 0.07 13.25 0.05 0.05 13.50 0.05 0.05 13.75 0.04 0.04 14.00 0.04 0.04 14.25 0.04 0.04 14.50 0.03 0.03 14.75 0.03 0.03 15.00 0.03 0.03 15.25 0.03 0.03 15.50 0.03 0.03 15.75 0.02 0.02 16.00 0.02 0.02 16.25 0.02 0.02 16.50 0.02 0.02 16.75 0.02 0.02 17.00 0.02 0.02 17.25 0.02 0.02 17.50 0.02 0.02 17.75 0.02 0.02 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.01 0.01 18.25 0.01 0.01 18.50 0.01 0.01 18.75 0.01 0.01 19.00 0.01 0.01 19.25 0.01 0.01 19.50 0.01 0.01 19.75 0.01 0.01 20.00 0.01 0.01 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 32HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.46% Impervious, Inflow Depth > 0.32" for 2yr24hr event Inflow = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af Outflow = 0.18 cfs @ 12.43 hrs, Volume= 0.028 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=1.032 ac 0.18 cfs 0.18 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 33HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.13 0.13 12.50 0.17 0.17 12.75 0.11 0.11 13.00 0.08 0.08 13.25 0.06 0.06 13.50 0.06 0.06 13.75 0.05 0.05 14.00 0.05 0.05 14.25 0.05 0.05 14.50 0.04 0.04 14.75 0.04 0.04 15.00 0.04 0.04 15.25 0.04 0.04 15.50 0.04 0.04 15.75 0.03 0.03 16.00 0.03 0.03 16.25 0.03 0.03 16.50 0.03 0.03 16.75 0.03 0.03 17.00 0.02 0.02 17.25 0.02 0.02 17.50 0.02 0.02 17.75 0.02 0.02 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 34HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.30% Impervious, Inflow Depth > 0.45" for 2yr24hr event Inflow = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af Outflow = 0.28 cfs @ 12.74 hrs, Volume= 0.049 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.304 ac 0.28 cfs 0.28 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 35HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.05 0.05 12.50 0.21 0.21 12.75 0.28 0.28 13.00 0.23 0.23 13.25 0.17 0.17 13.50 0.13 0.13 13.75 0.11 0.11 14.00 0.10 0.10 14.25 0.09 0.09 14.50 0.08 0.08 14.75 0.07 0.07 15.00 0.07 0.07 15.25 0.07 0.07 15.50 0.06 0.06 15.75 0.06 0.06 16.00 0.06 0.06 16.25 0.05 0.05 16.50 0.05 0.05 16.75 0.04 0.04 17.00 0.04 0.04 17.25 0.04 0.04 17.50 0.04 0.04 17.75 0.04 0.04 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.03 0.03 18.25 0.03 0.03 18.50 0.03 0.03 18.75 0.03 0.03 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 36HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.34% Impervious, Inflow Depth > 0.32" for 2yr24hr event Inflow = 0.37 cfs @ 12.52 hrs, Volume= 0.061 af Outflow = 0.37 cfs @ 12.52 hrs, Volume= 0.061 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.297 ac 0.37 cfs 0.37 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 37HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.00 0.00 12.25 0.17 0.17 12.50 0.37 0.37 12.75 0.28 0.28 13.00 0.19 0.19 13.25 0.15 0.15 13.50 0.13 0.13 13.75 0.12 0.12 14.00 0.11 0.11 14.25 0.11 0.11 14.50 0.10 0.10 14.75 0.10 0.10 15.00 0.09 0.09 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.06 0.06 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 38HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 28.71% Impervious, Inflow Depth > 0.57" for 2yr24hr event Inflow = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af Outflow = 0.77 cfs @ 12.40 hrs, Volume= 0.096 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.007 ac 0.77 cfs 0.77 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 39HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.05 0.05 12.25 0.60 0.60 12.50 0.72 0.72 12.75 0.45 0.45 13.00 0.28 0.28 13.25 0.21 0.21 13.50 0.18 0.18 13.75 0.17 0.17 14.00 0.15 0.15 14.25 0.14 0.14 14.50 0.13 0.13 14.75 0.12 0.12 15.00 0.12 0.12 15.25 0.11 0.11 15.50 0.10 0.10 15.75 0.10 0.10 16.00 0.09 0.09 16.25 0.08 0.08 16.50 0.08 0.08 16.75 0.07 0.07 17.00 0.07 0.07 17.25 0.07 0.07 17.50 0.06 0.06 17.75 0.06 0.06 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.05 0.05 18.50 0.05 0.05 18.75 0.05 0.05 19.00 0.05 0.05 19.25 0.05 0.05 19.50 0.05 0.05 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 40HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.56% Impervious, Inflow Depth > 0.46" for 2yr24hr event Inflow = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af Outflow = 0.48 cfs @ 12.39 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.667 ac 0.48 cfs 0.48 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 41HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.01 0.01 12.25 0.39 0.39 12.50 0.45 0.45 12.75 0.27 0.27 13.00 0.18 0.18 13.25 0.14 0.14 13.50 0.12 0.12 13.75 0.11 0.11 14.00 0.11 0.11 14.25 0.10 0.10 14.50 0.09 0.09 14.75 0.09 0.09 15.00 0.08 0.08 15.25 0.08 0.08 15.50 0.07 0.07 15.75 0.07 0.07 16.00 0.06 0.06 16.25 0.06 0.06 16.50 0.05 0.05 16.75 0.05 0.05 17.00 0.05 0.05 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.04 0.04 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 42HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 26.81% Impervious, Inflow Depth > 0.54" for 2yr24hr event Inflow = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af Outflow = 1.24 cfs @ 12.27 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=3.075 ac 1.24 cfs 1.24 cfs Type III 24-hr 2yr24hr Rainfall=3.39"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 43HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.14 0.14 12.25 1.23 1.23 12.50 0.92 0.92 12.75 0.47 0.47 13.00 0.33 0.33 13.25 0.27 0.27 13.50 0.25 0.25 13.75 0.23 0.23 14.00 0.21 0.21 14.25 0.20 0.20 14.50 0.19 0.19 14.75 0.18 0.18 15.00 0.17 0.17 15.25 0.16 0.16 15.50 0.15 0.15 15.75 0.14 0.14 16.00 0.13 0.13 16.25 0.12 0.12 16.50 0.11 0.11 16.75 0.10 0.10 17.00 0.10 0.10 17.25 0.09 0.09 17.50 0.09 0.09 17.75 0.08 0.08 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.08 0.08 18.25 0.07 0.07 18.50 0.07 0.07 18.75 0.07 0.07 19.00 0.07 0.07 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.06 0.06 20.00 0.06 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 44HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,522 sf 38.62% Impervious Runoff Depth>1.21"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=1.50 cfs 0.105 af Runoff Area=16,878 sf 55.62% Impervious Runoff Depth>1.98"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.68 cfs 0.064 af Runoff Area=44,946 sf 22.46% Impervious Runoff Depth>0.95"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=0.76 cfs 0.082 af Runoff Area=56,816 sf 31.30% Impervious Runoff Depth>1.18"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=0.88 cfs 0.129 af Runoff Area=100,078 sf 15.34% Impervious Runoff Depth>0.95"Subcatchment 5S: SC-5 Flow Length=315' Tc=23.4 min CN=57 Runoff=1.52 cfs 0.182 af Runoff Area=87,415 sf 28.71% Impervious Runoff Depth>1.39"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=2.15 cfs 0.233 af Runoff Area=72,600 sf 20.56% Impervious Runoff Depth>1.20"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=1.56 cfs 0.166 af Runoff Area=133,967 sf 26.81% Impervious Runoff Depth>1.33"Subcatchment 8S: SC-8 Flow Length=632' Tc=15.2 min CN=63 Runoff=3.65 cfs 0.341 af Inflow=1.50 cfs 0.105 afReach 1R: AP-1 Outflow=1.50 cfs 0.105 af Inflow=0.68 cfs 0.064 afReach 2R: AP-2 Outflow=0.68 cfs 0.064 af Inflow=0.76 cfs 0.082 afReach 3R: AP-3 Outflow=0.76 cfs 0.082 af Inflow=0.88 cfs 0.129 afReach 4R: AP-4 Outflow=0.88 cfs 0.129 af Inflow=1.52 cfs 0.182 afReach 5R: AP-5 Outflow=1.52 cfs 0.182 af Inflow=2.15 cfs 0.233 afReach 6R: AP-6 Outflow=2.15 cfs 0.233 af Inflow=1.56 cfs 0.166 afReach 7R: AP-7 Outflow=1.56 cfs 0.166 af Inflow=3.65 cfs 0.341 afReach 8R: AP-8 Outflow=3.65 cfs 0.341 af Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 45HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 1.302 af Average Runoff Depth = 1.22" 73.82% Pervious = 9.460 ac 26.18% Impervious = 3.355 ac Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 46HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af, Depth> 1.21" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description 11,163 36 Woods, Fair, HSG A 22,370 54 1/2 acre lots, 25% imp, HSG A 11,989 98 Paved parking, HSG A 45,522 61 Weighted Average 27,941 61.38% Pervious Area 17,582 38.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 47HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=45,522 sf Runoff Volume=0.105 af Runoff Depth>1.21" Flow Length=471' Tc=5.0 min CN=61 1.50 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 48HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.03 11.75 1.75 0.03 0.15 12.00 2.47 0.19 0.82 12.25 3.19 0.44 0.83 12.50 3.47 0.56 0.42 12.75 3.60 0.62 0.25 13.00 3.70 0.67 0.20 13.25 3.79 0.71 0.17 13.50 3.87 0.75 0.16 13.75 3.94 0.78 0.15 14.00 4.01 0.82 0.13 14.25 4.07 0.85 0.13 14.50 4.12 0.87 0.12 14.75 4.17 0.90 0.11 15.00 4.22 0.93 0.11 15.25 4.26 0.95 0.10 15.50 4.31 0.97 0.09 15.75 4.34 0.99 0.08 16.00 4.38 1.01 0.08 16.25 4.41 1.03 0.07 16.50 4.44 1.04 0.07 16.75 4.47 1.06 0.07 17.00 4.49 1.08 0.06 17.25 4.52 1.09 0.06 17.50 4.54 1.10 0.06 17.75 4.56 1.12 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.05 18.25 4.60 1.14 0.05 18.50 4.62 1.15 0.05 18.75 4.64 1.16 0.04 19.00 4.66 1.17 0.04 19.25 4.68 1.18 0.04 19.50 4.69 1.19 0.04 19.75 4.71 1.20 0.04 20.00 4.73 1.21 0.04 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 49HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af, Depth> 1.98" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,297 54 1/2 acre lots, 25% imp, HSG A 7,313 98 Paved parking, HSG A 16,878 72 Weighted Average 7,491 44.38% Pervious Area 9,387 55.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=16,878 sf Runoff Volume=0.064 af Runoff Depth>1.98" Flow Length=316' Tc=18.0 min CN=72 0.68 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 50HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.01 0.00 10.25 1.00 0.01 0.01 10.50 1.07 0.02 0.01 10.75 1.15 0.03 0.02 11.00 1.24 0.05 0.02 11.25 1.34 0.07 0.03 11.50 1.47 0.11 0.04 11.75 1.75 0.20 0.08 12.00 2.47 0.51 0.24 12.25 3.19 0.92 0.67 12.50 3.47 1.10 0.44 12.75 3.60 1.19 0.21 13.00 3.70 1.26 0.13 13.25 3.79 1.32 0.10 13.50 3.87 1.37 0.09 13.75 3.94 1.42 0.08 14.00 4.01 1.46 0.07 14.25 4.07 1.51 0.07 14.50 4.12 1.54 0.06 14.75 4.17 1.58 0.06 15.00 4.22 1.62 0.06 15.25 4.26 1.65 0.05 15.50 4.31 1.68 0.05 15.75 4.34 1.71 0.04 16.00 4.38 1.73 0.04 16.25 4.41 1.75 0.04 16.50 4.44 1.77 0.04 16.75 4.47 1.80 0.03 17.00 4.49 1.82 0.03 17.25 4.52 1.83 0.03 17.50 4.54 1.85 0.03 17.75 4.56 1.87 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.88 0.02 18.25 4.60 1.90 0.02 18.50 4.62 1.91 0.02 18.75 4.64 1.93 0.02 19.00 4.66 1.94 0.02 19.25 4.68 1.95 0.02 19.50 4.69 1.97 0.02 19.75 4.71 1.98 0.02 20.00 4.73 1.99 0.02 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 51HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af, Depth> 0.95" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 17,794 36 * 17,056 54 * 10,096 98 44,946 57 Weighted Average 34,850 77.54% Pervious Area 10,096 22.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 52HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=44,946 sf Runoff Volume=0.082 af Runoff Depth>0.95" Flow Length=464' Tc=17.6 min CN=57 0.76 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 53HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.00 0.00 11.75 1.75 0.01 0.01 12.00 2.47 0.11 0.13 12.25 3.19 0.30 0.75 12.50 3.47 0.40 0.58 12.75 3.60 0.45 0.31 13.00 3.70 0.50 0.20 13.25 3.79 0.53 0.16 13.50 3.87 0.56 0.14 13.75 3.94 0.59 0.13 14.00 4.01 0.62 0.12 14.25 4.07 0.65 0.11 14.50 4.12 0.67 0.11 14.75 4.17 0.69 0.10 15.00 4.22 0.72 0.09 15.25 4.26 0.74 0.09 15.50 4.31 0.76 0.08 15.75 4.34 0.77 0.08 16.00 4.38 0.79 0.07 16.25 4.41 0.80 0.06 16.50 4.44 0.82 0.06 16.75 4.47 0.83 0.06 17.00 4.49 0.85 0.06 17.25 4.52 0.86 0.05 17.50 4.54 0.87 0.05 17.75 4.56 0.88 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 0.89 0.04 18.25 4.60 0.90 0.04 18.50 4.62 0.91 0.04 18.75 4.64 0.92 0.04 19.00 4.66 0.93 0.04 19.25 4.68 0.94 0.04 19.50 4.69 0.95 0.04 19.75 4.71 0.95 0.04 20.00 4.73 0.96 0.03 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 54HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af, Depth> 1.18" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 21,624 36 * 17,411 54 * 17,781 98 56,816 61 Weighted Average 39,035 68.70% Pervious Area 17,781 31.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 55HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=56,816 sf Runoff Volume=0.129 af Runoff Depth>1.18" Flow Length=679' Tc=42.9 min CN=61 0.88 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 56HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.00 11.75 1.75 0.03 0.01 12.00 2.47 0.19 0.07 12.25 3.19 0.44 0.33 12.50 3.47 0.56 0.78 12.75 3.60 0.62 0.85 13.00 3.70 0.67 0.62 13.25 3.79 0.71 0.43 13.50 3.87 0.75 0.32 13.75 3.94 0.78 0.26 14.00 4.01 0.82 0.22 14.25 4.07 0.85 0.20 14.50 4.12 0.87 0.18 14.75 4.17 0.90 0.16 15.00 4.22 0.93 0.15 15.25 4.26 0.95 0.14 15.50 4.31 0.97 0.14 15.75 4.34 0.99 0.13 16.00 4.38 1.01 0.12 16.25 4.41 1.03 0.11 16.50 4.44 1.04 0.10 16.75 4.47 1.06 0.09 17.00 4.49 1.08 0.09 17.25 4.52 1.09 0.08 17.50 4.54 1.10 0.08 17.75 4.56 1.12 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.07 18.25 4.60 1.14 0.07 18.50 4.62 1.15 0.06 18.75 4.64 1.16 0.06 19.00 4.66 1.17 0.06 19.25 4.68 1.18 0.06 19.50 4.69 1.19 0.05 19.75 4.71 1.20 0.05 20.00 4.73 1.21 0.05 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 57HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 1.52 cfs @ 12.39 hrs, Volume= 0.182 af, Depth> 0.95" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 20,625 36 * 64,101 54 * 15,352 98 100,078 57 Weighted Average 84,726 84.66% Pervious Area 15,352 15.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 2.4 205 0.0050 1.44 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.4 315 Total Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 58HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=100,078 sf Runoff Volume=0.182 af Runoff Depth>0.95" Flow Length=315' Tc=23.4 min CN=57 1.52 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 59HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.00 0.00 11.75 1.75 0.01 0.00 12.00 2.47 0.11 0.17 12.25 3.19 0.30 1.23 12.50 3.47 0.40 1.40 12.75 3.60 0.45 0.87 13.00 3.70 0.50 0.53 13.25 3.79 0.53 0.39 13.50 3.87 0.56 0.33 13.75 3.94 0.59 0.30 14.00 4.01 0.62 0.28 14.25 4.07 0.65 0.26 14.50 4.12 0.67 0.24 14.75 4.17 0.69 0.23 15.00 4.22 0.72 0.22 15.25 4.26 0.74 0.20 15.50 4.31 0.76 0.19 15.75 4.34 0.77 0.18 16.00 4.38 0.79 0.16 16.25 4.41 0.80 0.15 16.50 4.44 0.82 0.14 16.75 4.47 0.83 0.13 17.00 4.49 0.85 0.13 17.25 4.52 0.86 0.12 17.50 4.54 0.87 0.11 17.75 4.56 0.88 0.11 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 0.89 0.10 18.25 4.60 0.90 0.09 18.50 4.62 0.91 0.09 18.75 4.64 0.92 0.09 19.00 4.66 0.93 0.09 19.25 4.68 0.94 0.08 19.50 4.69 0.95 0.08 19.75 4.71 0.95 0.08 20.00 4.73 0.96 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 60HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af, Depth> 1.39" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 14,520 36 * 47,798 54 * 25,097 98 87,415 64 Weighted Average 62,318 71.29% Pervious Area 25,097 28.71% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=87,415 sf Runoff Volume=0.233 af Runoff Depth>1.39" Flow Length=520' Tc=23.1 min CN=64 2.15 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 61HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.01 0.02 11.50 1.47 0.02 0.05 11.75 1.75 0.06 0.13 12.00 2.47 0.26 0.49 12.25 3.19 0.55 1.91 12.50 3.47 0.69 1.84 12.75 3.60 0.76 1.06 13.00 3.70 0.81 0.63 13.25 3.79 0.86 0.46 13.50 3.87 0.90 0.38 13.75 3.94 0.94 0.35 14.00 4.01 0.98 0.32 14.25 4.07 1.01 0.29 14.50 4.12 1.04 0.27 14.75 4.17 1.07 0.25 15.00 4.22 1.10 0.24 15.25 4.26 1.12 0.23 15.50 4.31 1.15 0.21 15.75 4.34 1.17 0.19 16.00 4.38 1.19 0.18 16.25 4.41 1.21 0.16 16.50 4.44 1.23 0.15 16.75 4.47 1.25 0.14 17.00 4.49 1.26 0.14 17.25 4.52 1.28 0.13 17.50 4.54 1.29 0.12 17.75 4.56 1.30 0.12 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.32 0.11 18.25 4.60 1.33 0.10 18.50 4.62 1.34 0.10 18.75 4.64 1.35 0.10 19.00 4.66 1.36 0.09 19.25 4.68 1.38 0.09 19.50 4.69 1.39 0.09 19.75 4.71 1.40 0.09 20.00 4.73 1.41 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 62HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af, Depth> 1.20" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 7,201 36 * 50,476 54 * 14,923 98 72,600 61 Weighted Average 57,677 79.44% Pervious Area 14,923 20.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 63HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=72,600 sf Runoff Volume=0.166 af Runoff Depth>1.20" Flow Length=248' Tc=20.4 min CN=61 1.56 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 64HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.00 11.50 1.47 0.01 0.01 11.75 1.75 0.03 0.06 12.00 2.47 0.19 0.34 12.25 3.19 0.44 1.47 12.50 3.47 0.56 1.26 12.75 3.60 0.62 0.69 13.00 3.70 0.67 0.43 13.25 3.79 0.71 0.32 13.50 3.87 0.75 0.28 13.75 3.94 0.78 0.26 14.00 4.01 0.82 0.23 14.25 4.07 0.85 0.21 14.50 4.12 0.87 0.20 14.75 4.17 0.90 0.19 15.00 4.22 0.93 0.18 15.25 4.26 0.95 0.17 15.50 4.31 0.97 0.16 15.75 4.34 0.99 0.15 16.00 4.38 1.01 0.13 16.25 4.41 1.03 0.12 16.50 4.44 1.04 0.11 16.75 4.47 1.06 0.11 17.00 4.49 1.08 0.10 17.25 4.52 1.09 0.10 17.50 4.54 1.10 0.09 17.75 4.56 1.12 0.09 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.13 0.08 18.25 4.60 1.14 0.08 18.50 4.62 1.15 0.07 18.75 4.64 1.16 0.07 19.00 4.66 1.17 0.07 19.25 4.68 1.18 0.07 19.50 4.69 1.19 0.07 19.75 4.71 1.20 0.07 20.00 4.73 1.21 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 65HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af, Depth> 1.33" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10yr24hr Rainfall=4.94" Area (sf) CN Description * 19,294 36 * 78,756 54 * 35,917 98 133,967 63 Weighted Average 98,050 73.19% Pervious Area 35,917 26.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 400 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 632 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 10yr24hr Rainfall=4.94" Runoff Area=133,967 sf Runoff Volume=0.341 af Runoff Depth>1.33" Flow Length=632' Tc=15.2 min CN=63 3.65 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 66HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.28 0.00 0.00 5.25 0.30 0.00 0.00 5.50 0.32 0.00 0.00 5.75 0.34 0.00 0.00 6.00 0.36 0.00 0.00 6.25 0.38 0.00 0.00 6.50 0.40 0.00 0.00 6.75 0.42 0.00 0.00 7.00 0.45 0.00 0.00 7.25 0.47 0.00 0.00 7.50 0.50 0.00 0.00 7.75 0.53 0.00 0.00 8.00 0.56 0.00 0.00 8.25 0.60 0.00 0.00 8.50 0.63 0.00 0.00 8.75 0.68 0.00 0.00 9.00 0.72 0.00 0.00 9.25 0.77 0.00 0.00 9.50 0.82 0.00 0.00 9.75 0.87 0.00 0.00 10.00 0.93 0.00 0.00 10.25 1.00 0.00 0.00 10.50 1.07 0.00 0.00 10.75 1.15 0.00 0.00 11.00 1.24 0.00 0.00 11.25 1.34 0.00 0.03 11.50 1.47 0.01 0.09 11.75 1.75 0.05 0.27 12.00 2.47 0.23 1.11 12.25 3.19 0.51 3.63 12.50 3.47 0.64 2.24 12.75 3.60 0.71 1.07 13.00 3.70 0.76 0.74 13.25 3.79 0.81 0.59 13.50 3.87 0.85 0.53 13.75 3.94 0.89 0.49 14.00 4.01 0.92 0.45 14.25 4.07 0.95 0.41 14.50 4.12 0.98 0.39 14.75 4.17 1.01 0.37 15.00 4.22 1.04 0.35 15.25 4.26 1.07 0.32 15.50 4.31 1.09 0.30 15.75 4.34 1.11 0.28 16.00 4.38 1.13 0.25 16.25 4.41 1.15 0.23 16.50 4.44 1.17 0.22 16.75 4.47 1.18 0.21 17.00 4.49 1.20 0.20 17.25 4.52 1.21 0.19 17.50 4.54 1.23 0.18 17.75 4.56 1.24 0.17 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 4.58 1.25 0.16 18.25 4.60 1.26 0.15 18.50 4.62 1.28 0.14 18.75 4.64 1.29 0.14 19.00 4.66 1.30 0.14 19.25 4.68 1.31 0.13 19.50 4.69 1.32 0.13 19.75 4.71 1.33 0.13 20.00 4.73 1.34 0.12 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 67HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.62% Impervious, Inflow Depth > 1.21" for 10yr24hr event Inflow = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af Outflow = 1.50 cfs @ 12.09 hrs, Volume= 0.105 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.045 ac 1.50 cfs 1.50 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 68HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.03 0.03 11.75 0.15 0.15 12.00 0.82 0.82 12.25 0.83 0.83 12.50 0.42 0.42 12.75 0.25 0.25 13.00 0.20 0.20 13.25 0.17 0.17 13.50 0.16 0.16 13.75 0.15 0.15 14.00 0.13 0.13 14.25 0.13 0.13 14.50 0.12 0.12 14.75 0.11 0.11 15.00 0.11 0.11 15.25 0.10 0.10 15.50 0.09 0.09 15.75 0.08 0.08 16.00 0.08 0.08 16.25 0.07 0.07 16.50 0.07 0.07 16.75 0.07 0.07 17.00 0.06 0.06 17.25 0.06 0.06 17.50 0.06 0.06 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.05 0.05 18.25 0.05 0.05 18.50 0.05 0.05 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.04 0.04 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 69HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.62% Impervious, Inflow Depth > 1.98" for 10yr24hr event Inflow = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af Outflow = 0.68 cfs @ 12.26 hrs, Volume= 0.064 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.387 ac 0.68 cfs 0.68 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 70HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.01 0.01 10.50 0.01 0.01 10.75 0.02 0.02 11.00 0.02 0.02 11.25 0.03 0.03 11.50 0.04 0.04 11.75 0.08 0.08 12.00 0.24 0.24 12.25 0.67 0.67 12.50 0.44 0.44 12.75 0.21 0.21 13.00 0.13 0.13 13.25 0.10 0.10 13.50 0.09 0.09 13.75 0.08 0.08 14.00 0.07 0.07 14.25 0.07 0.07 14.50 0.06 0.06 14.75 0.06 0.06 15.00 0.06 0.06 15.25 0.05 0.05 15.50 0.05 0.05 15.75 0.04 0.04 16.00 0.04 0.04 16.25 0.04 0.04 16.50 0.04 0.04 16.75 0.03 0.03 17.00 0.03 0.03 17.25 0.03 0.03 17.50 0.03 0.03 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.02 0.02 18.25 0.02 0.02 18.50 0.02 0.02 18.75 0.02 0.02 19.00 0.02 0.02 19.25 0.02 0.02 19.50 0.02 0.02 19.75 0.02 0.02 20.00 0.02 0.02 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 71HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.46% Impervious, Inflow Depth > 0.95" for 10yr24hr event Inflow = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af Outflow = 0.76 cfs @ 12.29 hrs, Volume= 0.082 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.032 ac 0.76 cfs 0.76 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 72HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.01 0.01 12.00 0.13 0.13 12.25 0.75 0.75 12.50 0.58 0.58 12.75 0.31 0.31 13.00 0.20 0.20 13.25 0.16 0.16 13.50 0.14 0.14 13.75 0.13 0.13 14.00 0.12 0.12 14.25 0.11 0.11 14.50 0.11 0.11 14.75 0.10 0.10 15.00 0.09 0.09 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.06 0.06 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.04 0.04 19.75 0.04 0.04 20.00 0.03 0.03 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 73HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.30% Impervious, Inflow Depth > 1.18" for 10yr24hr event Inflow = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af Outflow = 0.88 cfs @ 12.66 hrs, Volume= 0.129 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.304 ac 0.88 cfs 0.88 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 74HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.01 0.01 12.00 0.07 0.07 12.25 0.33 0.33 12.50 0.78 0.78 12.75 0.85 0.85 13.00 0.62 0.62 13.25 0.43 0.43 13.50 0.32 0.32 13.75 0.26 0.26 14.00 0.22 0.22 14.25 0.20 0.20 14.50 0.18 0.18 14.75 0.16 0.16 15.00 0.15 0.15 15.25 0.14 0.14 15.50 0.14 0.14 15.75 0.13 0.13 16.00 0.12 0.12 16.25 0.11 0.11 16.50 0.10 0.10 16.75 0.09 0.09 17.00 0.09 0.09 17.25 0.08 0.08 17.50 0.08 0.08 17.75 0.07 0.07 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.07 0.07 18.25 0.07 0.07 18.50 0.06 0.06 18.75 0.06 0.06 19.00 0.06 0.06 19.25 0.06 0.06 19.50 0.05 0.05 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 75HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.34% Impervious, Inflow Depth > 0.95" for 10yr24hr event Inflow = 1.52 cfs @ 12.39 hrs, Volume= 0.182 af Outflow = 1.52 cfs @ 12.39 hrs, Volume= 0.182 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=2.297 ac 1.52 cfs 1.52 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 76HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.00 0.00 11.75 0.00 0.00 12.00 0.17 0.17 12.25 1.23 1.23 12.50 1.40 1.40 12.75 0.87 0.87 13.00 0.53 0.53 13.25 0.39 0.39 13.50 0.33 0.33 13.75 0.30 0.30 14.00 0.28 0.28 14.25 0.26 0.26 14.50 0.24 0.24 14.75 0.23 0.23 15.00 0.22 0.22 15.25 0.20 0.20 15.50 0.19 0.19 15.75 0.18 0.18 16.00 0.16 0.16 16.25 0.15 0.15 16.50 0.14 0.14 16.75 0.13 0.13 17.00 0.13 0.13 17.25 0.12 0.12 17.50 0.11 0.11 17.75 0.11 0.11 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.10 0.10 18.25 0.09 0.09 18.50 0.09 0.09 18.75 0.09 0.09 19.00 0.09 0.09 19.25 0.08 0.08 19.50 0.08 0.08 19.75 0.08 0.08 20.00 0.08 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 77HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 28.71% Impervious, Inflow Depth > 1.39" for 10yr24hr event Inflow = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af Outflow = 2.15 cfs @ 12.35 hrs, Volume= 0.233 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=2.007 ac 2.15 cfs 2.15 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 78HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.02 0.02 11.50 0.05 0.05 11.75 0.13 0.13 12.00 0.49 0.49 12.25 1.91 1.91 12.50 1.84 1.84 12.75 1.06 1.06 13.00 0.63 0.63 13.25 0.46 0.46 13.50 0.38 0.38 13.75 0.35 0.35 14.00 0.32 0.32 14.25 0.29 0.29 14.50 0.27 0.27 14.75 0.25 0.25 15.00 0.24 0.24 15.25 0.23 0.23 15.50 0.21 0.21 15.75 0.19 0.19 16.00 0.18 0.18 16.25 0.16 0.16 16.50 0.15 0.15 16.75 0.14 0.14 17.00 0.14 0.14 17.25 0.13 0.13 17.50 0.12 0.12 17.75 0.12 0.12 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.11 0.11 18.25 0.10 0.10 18.50 0.10 0.10 18.75 0.10 0.10 19.00 0.09 0.09 19.25 0.09 0.09 19.50 0.09 0.09 19.75 0.09 0.09 20.00 0.08 0.08 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 79HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.56% Impervious, Inflow Depth > 1.20" for 10yr24hr event Inflow = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af Outflow = 1.56 cfs @ 12.32 hrs, Volume= 0.166 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.667 ac 1.56 cfs 1.56 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 80HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.06 0.06 12.00 0.34 0.34 12.25 1.47 1.47 12.50 1.26 1.26 12.75 0.69 0.69 13.00 0.43 0.43 13.25 0.32 0.32 13.50 0.28 0.28 13.75 0.26 0.26 14.00 0.23 0.23 14.25 0.21 0.21 14.50 0.20 0.20 14.75 0.19 0.19 15.00 0.18 0.18 15.25 0.17 0.17 15.50 0.16 0.16 15.75 0.15 0.15 16.00 0.13 0.13 16.25 0.12 0.12 16.50 0.11 0.11 16.75 0.11 0.11 17.00 0.10 0.10 17.25 0.10 0.10 17.50 0.09 0.09 17.75 0.09 0.09 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.08 0.08 18.25 0.08 0.08 18.50 0.07 0.07 18.75 0.07 0.07 19.00 0.07 0.07 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.06 0.06 Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 81HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 26.81% Impervious, Inflow Depth > 1.33" for 10yr24hr event Inflow = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af Outflow = 3.65 cfs @ 12.23 hrs, Volume= 0.341 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=3.075 ac 3.65 cfs 3.65 cfs Type III 24-hr 10yr24hr Rainfall=4.94"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 82HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.03 0.03 11.50 0.09 0.09 11.75 0.27 0.27 12.00 1.11 1.11 12.25 3.63 3.63 12.50 2.24 2.24 12.75 1.07 1.07 13.00 0.74 0.74 13.25 0.59 0.59 13.50 0.53 0.53 13.75 0.49 0.49 14.00 0.45 0.45 14.25 0.41 0.41 14.50 0.39 0.39 14.75 0.37 0.37 15.00 0.35 0.35 15.25 0.32 0.32 15.50 0.30 0.30 15.75 0.28 0.28 16.00 0.25 0.25 16.25 0.23 0.23 16.50 0.22 0.22 16.75 0.21 0.21 17.00 0.20 0.20 17.25 0.19 0.19 17.50 0.18 0.18 17.75 0.17 0.17 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.16 0.16 18.25 0.15 0.15 18.50 0.14 0.14 18.75 0.14 0.14 19.00 0.14 0.14 19.25 0.13 0.13 19.50 0.13 0.13 19.75 0.13 0.13 20.00 0.12 0.12 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 83HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,522 sf 38.62% Impervious Runoff Depth>1.78"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=2.28 cfs 0.155 af Runoff Area=16,878 sf 55.62% Impervious Runoff Depth>2.70"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=0.93 cfs 0.087 af Runoff Area=44,946 sf 22.46% Impervious Runoff Depth>1.46"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=1.25 cfs 0.126 af Runoff Area=56,816 sf 31.30% Impervious Runoff Depth>1.75"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=1.34 cfs 0.190 af Runoff Area=100,078 sf 15.34% Impervious Runoff Depth>1.46"Subcatchment 5S: SC-5 Flow Length=315' Tc=23.4 min CN=57 Runoff=2.49 cfs 0.279 af Runoff Area=87,415 sf 28.71% Impervious Runoff Depth>2.00"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=3.16 cfs 0.335 af Runoff Area=72,600 sf 20.56% Impervious Runoff Depth>1.76"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=2.39 cfs 0.245 af Runoff Area=133,967 sf 26.81% Impervious Runoff Depth>1.93"Subcatchment 8S: SC-8 Flow Length=632' Tc=15.2 min CN=63 Runoff=5.48 cfs 0.494 af Inflow=2.28 cfs 0.155 afReach 1R: AP-1 Outflow=2.28 cfs 0.155 af Inflow=0.93 cfs 0.087 afReach 2R: AP-2 Outflow=0.93 cfs 0.087 af Inflow=1.25 cfs 0.126 afReach 3R: AP-3 Outflow=1.25 cfs 0.126 af Inflow=1.34 cfs 0.190 afReach 4R: AP-4 Outflow=1.34 cfs 0.190 af Inflow=2.49 cfs 0.279 afReach 5R: AP-5 Outflow=2.49 cfs 0.279 af Inflow=3.16 cfs 0.335 afReach 6R: AP-6 Outflow=3.16 cfs 0.335 af Inflow=2.39 cfs 0.245 afReach 7R: AP-7 Outflow=2.39 cfs 0.245 af Inflow=5.48 cfs 0.494 afReach 8R: AP-8 Outflow=5.48 cfs 0.494 af Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 84HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 1.910 af Average Runoff Depth = 1.79" 73.82% Pervious = 9.460 ac 26.18% Impervious = 3.355 ac Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 85HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af, Depth> 1.78" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description 11,163 36 Woods, Fair, HSG A 22,370 54 1/2 acre lots, 25% imp, HSG A 11,989 98 Paved parking, HSG A 45,522 61 Weighted Average 27,941 61.38% Pervious Area 17,582 38.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 86HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=45,522 sf Runoff Volume=0.155 af Runoff Depth>1.78" Flow Length=471' Tc=5.0 min CN=61 2.28 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 87HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.01 11.00 1.48 0.01 0.02 11.25 1.60 0.02 0.05 11.50 1.76 0.03 0.09 11.75 2.10 0.09 0.31 12.00 2.95 0.35 1.34 12.25 3.81 0.72 1.20 12.50 4.15 0.89 0.60 12.75 4.31 0.97 0.34 13.00 4.43 1.04 0.27 13.25 4.54 1.10 0.24 13.50 4.63 1.15 0.22 13.75 4.72 1.20 0.20 14.00 4.79 1.25 0.18 14.25 4.86 1.29 0.17 14.50 4.93 1.33 0.16 14.75 4.99 1.36 0.15 15.00 5.05 1.40 0.14 15.25 5.10 1.43 0.13 15.50 5.15 1.46 0.12 15.75 5.20 1.49 0.11 16.00 5.24 1.51 0.10 16.25 5.27 1.54 0.10 16.50 5.31 1.56 0.09 16.75 5.34 1.58 0.09 17.00 5.38 1.60 0.08 17.25 5.41 1.62 0.08 17.50 5.43 1.64 0.07 17.75 5.46 1.65 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.06 18.25 5.51 1.68 0.06 18.50 5.53 1.70 0.06 18.75 5.55 1.71 0.06 19.00 5.57 1.73 0.06 19.25 5.60 1.74 0.06 19.50 5.62 1.75 0.06 19.75 5.64 1.77 0.05 20.00 5.66 1.78 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 88HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af, Depth> 2.70" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,297 54 1/2 acre lots, 25% imp, HSG A 7,313 98 Paved parking, HSG A 16,878 72 Weighted Average 7,491 44.38% Pervious Area 9,387 55.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=16,878 sf Runoff Volume=0.087 af Runoff Depth>2.70" Flow Length=316' Tc=18.0 min CN=72 0.93 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 89HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.01 0.01 9.75 1.05 0.02 0.01 10.00 1.12 0.03 0.01 10.25 1.19 0.04 0.02 10.50 1.28 0.06 0.02 10.75 1.37 0.08 0.03 11.00 1.48 0.11 0.04 11.25 1.60 0.14 0.05 11.50 1.76 0.20 0.07 11.75 2.10 0.34 0.12 12.00 2.95 0.78 0.34 12.25 3.81 1.33 0.93 12.50 4.15 1.57 0.59 12.75 4.31 1.68 0.28 13.00 4.43 1.77 0.17 13.25 4.54 1.85 0.13 13.50 4.63 1.92 0.12 13.75 4.72 1.98 0.11 14.00 4.79 2.04 0.10 14.25 4.86 2.09 0.09 14.50 4.93 2.14 0.08 14.75 4.99 2.19 0.08 15.00 5.05 2.24 0.07 15.25 5.10 2.28 0.07 15.50 5.15 2.31 0.06 15.75 5.20 2.35 0.06 16.00 5.24 2.38 0.05 16.25 5.27 2.41 0.05 16.50 5.31 2.44 0.05 16.75 5.34 2.47 0.04 17.00 5.38 2.49 0.04 17.25 5.41 2.51 0.04 17.50 5.43 2.54 0.04 17.75 5.46 2.56 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 2.58 0.03 18.25 5.51 2.60 0.03 18.50 5.53 2.61 0.03 18.75 5.55 2.63 0.03 19.00 5.57 2.65 0.03 19.25 5.60 2.67 0.03 19.50 5.62 2.68 0.03 19.75 5.64 2.70 0.03 20.00 5.66 2.71 0.02 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 90HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af, Depth> 1.46" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 17,794 36 * 17,056 54 * 10,096 98 44,946 57 Weighted Average 34,850 77.54% Pervious Area 10,096 22.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 91HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=44,946 sf Runoff Volume=0.126 af Runoff Depth>1.46" Flow Length=464' Tc=17.6 min CN=57 1.25 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 92HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.00 0.00 11.25 1.60 0.00 0.00 11.50 1.76 0.01 0.01 11.75 2.10 0.04 0.06 12.00 2.95 0.23 0.31 12.25 3.81 0.54 1.24 12.50 4.15 0.68 0.89 12.75 4.31 0.76 0.45 13.00 4.43 0.82 0.29 13.25 4.54 0.87 0.23 13.50 4.63 0.91 0.20 13.75 4.72 0.96 0.19 14.00 4.79 1.00 0.17 14.25 4.86 1.03 0.16 14.50 4.93 1.07 0.15 14.75 4.99 1.10 0.14 15.00 5.05 1.13 0.13 15.25 5.10 1.16 0.12 15.50 5.15 1.19 0.12 15.75 5.20 1.21 0.11 16.00 5.24 1.23 0.10 16.25 5.27 1.25 0.09 16.50 5.31 1.27 0.08 16.75 5.34 1.29 0.08 17.00 5.38 1.31 0.08 17.25 5.41 1.33 0.07 17.50 5.43 1.34 0.07 17.75 5.46 1.36 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.37 0.06 18.25 5.51 1.39 0.06 18.50 5.53 1.40 0.06 18.75 5.55 1.41 0.05 19.00 5.57 1.42 0.05 19.25 5.60 1.44 0.05 19.50 5.62 1.45 0.05 19.75 5.64 1.46 0.05 20.00 5.66 1.47 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 93HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af, Depth> 1.75" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 21,624 36 * 17,411 54 * 17,781 98 56,816 61 Weighted Average 39,035 68.70% Pervious Area 17,781 31.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 94HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=56,816 sf Runoff Volume=0.190 af Runoff Depth>1.75" Flow Length=679' Tc=42.9 min CN=61 1.34 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 95HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.01 0.00 11.25 1.60 0.02 0.01 11.50 1.76 0.03 0.03 11.75 2.10 0.09 0.06 12.00 2.95 0.35 0.16 12.25 3.81 0.72 0.58 12.50 4.15 0.89 1.23 12.75 4.31 0.97 1.27 13.00 4.43 1.04 0.91 13.25 4.54 1.10 0.62 13.50 4.63 1.15 0.45 13.75 4.72 1.20 0.36 14.00 4.79 1.25 0.31 14.25 4.86 1.29 0.27 14.50 4.93 1.33 0.24 14.75 4.99 1.36 0.22 15.00 5.05 1.40 0.21 15.25 5.10 1.43 0.20 15.50 5.15 1.46 0.18 15.75 5.20 1.49 0.17 16.00 5.24 1.51 0.16 16.25 5.27 1.54 0.15 16.50 5.31 1.56 0.13 16.75 5.34 1.58 0.13 17.00 5.38 1.60 0.12 17.25 5.41 1.62 0.11 17.50 5.43 1.64 0.11 17.75 5.46 1.65 0.10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.09 18.25 5.51 1.68 0.09 18.50 5.53 1.70 0.08 18.75 5.55 1.71 0.08 19.00 5.57 1.73 0.08 19.25 5.60 1.74 0.08 19.50 5.62 1.75 0.07 19.75 5.64 1.77 0.07 20.00 5.66 1.78 0.07 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 96HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 2.49 cfs @ 12.37 hrs, Volume= 0.279 af, Depth> 1.46" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 20,625 36 * 64,101 54 * 15,352 98 100,078 57 Weighted Average 84,726 84.66% Pervious Area 15,352 15.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 2.4 205 0.0050 1.44 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.4 315 Total Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 97HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=100,078 sf Runoff Volume=0.279 af Runoff Depth>1.46" Flow Length=315' Tc=23.4 min CN=57 2.49 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 98HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.00 0.00 11.25 1.60 0.00 0.00 11.50 1.76 0.01 0.02 11.75 2.10 0.04 0.09 12.00 2.95 0.23 0.47 12.25 3.81 0.54 2.14 12.50 4.15 0.68 2.20 12.75 4.31 0.76 1.31 13.00 4.43 0.82 0.78 13.25 4.54 0.87 0.57 13.50 4.63 0.91 0.48 13.75 4.72 0.96 0.43 14.00 4.79 1.00 0.40 14.25 4.86 1.03 0.36 14.50 4.93 1.07 0.34 14.75 4.99 1.10 0.32 15.00 5.05 1.13 0.30 15.25 5.10 1.16 0.28 15.50 5.15 1.19 0.26 15.75 5.20 1.21 0.25 16.00 5.24 1.23 0.23 16.25 5.27 1.25 0.21 16.50 5.31 1.27 0.19 16.75 5.34 1.29 0.18 17.00 5.38 1.31 0.17 17.25 5.41 1.33 0.17 17.50 5.43 1.34 0.16 17.75 5.46 1.36 0.15 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.37 0.14 18.25 5.51 1.39 0.13 18.50 5.53 1.40 0.12 18.75 5.55 1.41 0.12 19.00 5.57 1.42 0.12 19.25 5.60 1.44 0.12 19.50 5.62 1.45 0.11 19.75 5.64 1.46 0.11 20.00 5.66 1.47 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 99HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af, Depth> 2.00" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 14,520 36 * 47,798 54 * 25,097 98 87,415 64 Weighted Average 62,318 71.29% Pervious Area 25,097 28.71% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)3 2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=87,415 sf Runoff Volume=0.335 af Runoff Depth>2.00" Flow Length=520' Tc=23.1 min CN=64 3.16 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 100HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.01 10.75 1.37 0.01 0.03 11.00 1.48 0.02 0.06 11.25 1.60 0.04 0.09 11.50 1.76 0.06 0.15 11.75 2.10 0.14 0.27 12.00 2.95 0.45 0.85 12.25 3.81 0.87 2.88 12.50 4.15 1.06 2.64 12.75 4.31 1.15 1.49 13.00 4.43 1.22 0.87 13.25 4.54 1.29 0.63 13.50 4.63 1.35 0.52 13.75 4.72 1.40 0.47 14.00 4.79 1.45 0.43 14.25 4.86 1.49 0.39 14.50 4.93 1.53 0.36 14.75 4.99 1.57 0.34 15.00 5.05 1.61 0.32 15.25 5.10 1.65 0.30 15.50 5.15 1.68 0.28 15.75 5.20 1.71 0.26 16.00 5.24 1.74 0.24 16.25 5.27 1.76 0.22 16.50 5.31 1.78 0.20 16.75 5.34 1.81 0.19 17.00 5.38 1.83 0.18 17.25 5.41 1.85 0.17 17.50 5.43 1.87 0.16 17.75 5.46 1.89 0.15 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.90 0.14 18.25 5.51 1.92 0.14 18.50 5.53 1.94 0.13 18.75 5.55 1.95 0.13 19.00 5.57 1.97 0.12 19.25 5.60 1.98 0.12 19.50 5.62 1.99 0.12 19.75 5.64 2.01 0.11 20.00 5.66 2.02 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 101HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af, Depth> 1.76" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 7,201 36 * 50,476 54 * 14,923 98 72,600 61 Weighted Average 57,677 79.44% Pervious Area 14,923 20.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 102HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=72,600 sf Runoff Volume=0.245 af Runoff Depth>1.76" Flow Length=248' Tc=20.4 min CN=61 2.39 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 103HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.00 10.75 1.37 0.00 0.00 11.00 1.48 0.01 0.02 11.25 1.60 0.02 0.04 11.50 1.76 0.03 0.08 11.75 2.10 0.09 0.18 12.00 2.95 0.35 0.64 12.25 3.81 0.72 2.30 12.50 4.15 0.89 1.85 12.75 4.31 0.97 0.98 13.00 4.43 1.04 0.60 13.25 4.54 1.10 0.45 13.50 4.63 1.15 0.39 13.75 4.72 1.20 0.35 14.00 4.79 1.25 0.32 14.25 4.86 1.29 0.29 14.50 4.93 1.33 0.27 14.75 4.99 1.36 0.26 15.00 5.05 1.40 0.24 15.25 5.10 1.43 0.23 15.50 5.15 1.46 0.21 15.75 5.20 1.49 0.20 16.00 5.24 1.51 0.18 16.25 5.27 1.54 0.17 16.50 5.31 1.56 0.16 16.75 5.34 1.58 0.15 17.00 5.38 1.60 0.14 17.25 5.41 1.62 0.13 17.50 5.43 1.64 0.13 17.75 5.46 1.65 0.12 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.67 0.11 18.25 5.51 1.68 0.10 18.50 5.53 1.70 0.10 18.75 5.55 1.71 0.10 19.00 5.57 1.73 0.10 19.25 5.60 1.74 0.09 19.50 5.62 1.75 0.09 19.75 5.64 1.77 0.09 20.00 5.66 1.78 0.09 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 104HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af, Depth> 1.93" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 25yr24hr Rainfall=5.91" Area (sf) CN Description * 19,294 36 * 78,756 54 * 35,917 98 133,967 63 Weighted Average 98,050 73.19% Pervious Area 35,917 26.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 400 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 632 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)6 5 4 3 2 1 0 Type III 24-hr 25yr24hr Rainfall=5.91" Runoff Area=133,967 sf Runoff Volume=0.494 af Runoff Depth>1.93" Flow Length=632' Tc=15.2 min CN=63 5.48 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 105HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.34 0.00 0.00 5.25 0.36 0.00 0.00 5.50 0.38 0.00 0.00 5.75 0.40 0.00 0.00 6.00 0.43 0.00 0.00 6.25 0.45 0.00 0.00 6.50 0.48 0.00 0.00 6.75 0.50 0.00 0.00 7.00 0.53 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.71 0.00 0.00 8.50 0.76 0.00 0.00 8.75 0.81 0.00 0.00 9.00 0.86 0.00 0.00 9.25 0.92 0.00 0.00 9.50 0.98 0.00 0.00 9.75 1.05 0.00 0.00 10.00 1.12 0.00 0.00 10.25 1.19 0.00 0.00 10.50 1.28 0.00 0.01 10.75 1.37 0.01 0.04 11.00 1.48 0.01 0.08 11.25 1.60 0.03 0.14 11.50 1.76 0.05 0.24 11.75 2.10 0.13 0.55 12.00 2.95 0.41 1.88 12.25 3.81 0.82 5.39 12.50 4.15 1.00 3.18 12.75 4.31 1.09 1.50 13.00 4.43 1.16 1.02 13.25 4.54 1.22 0.81 13.50 4.63 1.28 0.73 13.75 4.72 1.33 0.67 14.00 4.79 1.38 0.61 14.25 4.86 1.42 0.56 14.50 4.93 1.46 0.53 14.75 4.99 1.50 0.50 15.00 5.05 1.54 0.47 15.25 5.10 1.57 0.44 15.50 5.15 1.61 0.40 15.75 5.20 1.63 0.37 16.00 5.24 1.66 0.34 16.25 5.27 1.68 0.31 16.50 5.31 1.71 0.30 16.75 5.34 1.73 0.28 17.00 5.38 1.75 0.27 17.25 5.41 1.77 0.25 17.50 5.43 1.79 0.24 17.75 5.46 1.81 0.22 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 5.48 1.82 0.21 18.25 5.51 1.84 0.20 18.50 5.53 1.86 0.19 18.75 5.55 1.87 0.19 19.00 5.57 1.88 0.18 19.25 5.60 1.90 0.18 19.50 5.62 1.91 0.17 19.75 5.64 1.93 0.17 20.00 5.66 1.94 0.17 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 106HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.62% Impervious, Inflow Depth > 1.78" for 25yr24hr event Inflow = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af Outflow = 2.28 cfs @ 12.09 hrs, Volume= 0.155 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.045 ac 2.28 cfs 2.28 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 107HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.01 0.01 11.00 0.02 0.02 11.25 0.05 0.05 11.50 0.09 0.09 11.75 0.31 0.31 12.00 1.34 1.34 12.25 1.20 1.20 12.50 0.60 0.60 12.75 0.34 0.34 13.00 0.27 0.27 13.25 0.24 0.24 13.50 0.22 0.22 13.75 0.20 0.20 14.00 0.18 0.18 14.25 0.17 0.17 14.50 0.16 0.16 14.75 0.15 0.15 15.00 0.14 0.14 15.25 0.13 0.13 15.50 0.12 0.12 15.75 0.11 0.11 16.00 0.10 0.10 16.25 0.10 0.10 16.50 0.09 0.09 16.75 0.09 0.09 17.00 0.08 0.08 17.25 0.08 0.08 17.50 0.07 0.07 17.75 0.07 0.07 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.06 0.06 18.50 0.06 0.06 18.75 0.06 0.06 19.00 0.06 0.06 19.25 0.06 0.06 19.50 0.06 0.06 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 108HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.62% Impervious, Inflow Depth > 2.70" for 25yr24hr event Inflow = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af Outflow = 0.93 cfs @ 12.25 hrs, Volume= 0.087 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=0.387 ac 0.93 cfs 0.93 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 109HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.01 0.01 9.75 0.01 0.01 10.00 0.01 0.01 10.25 0.02 0.02 10.50 0.02 0.02 10.75 0.03 0.03 11.00 0.04 0.04 11.25 0.05 0.05 11.50 0.07 0.07 11.75 0.12 0.12 12.00 0.34 0.34 12.25 0.93 0.93 12.50 0.59 0.59 12.75 0.28 0.28 13.00 0.17 0.17 13.25 0.13 0.13 13.50 0.12 0.12 13.75 0.11 0.11 14.00 0.10 0.10 14.25 0.09 0.09 14.50 0.08 0.08 14.75 0.08 0.08 15.00 0.07 0.07 15.25 0.07 0.07 15.50 0.06 0.06 15.75 0.06 0.06 16.00 0.05 0.05 16.25 0.05 0.05 16.50 0.05 0.05 16.75 0.04 0.04 17.00 0.04 0.04 17.25 0.04 0.04 17.50 0.04 0.04 17.75 0.03 0.03 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.03 0.03 18.25 0.03 0.03 18.50 0.03 0.03 18.75 0.03 0.03 19.00 0.03 0.03 19.25 0.03 0.03 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.02 0.02 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 110HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.46% Impervious, Inflow Depth > 1.46" for 25yr24hr event Inflow = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af Outflow = 1.25 cfs @ 12.27 hrs, Volume= 0.126 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.032 ac 1.25 cfs 1.25 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 111HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.01 0.01 11.75 0.06 0.06 12.00 0.31 0.31 12.25 1.24 1.24 12.50 0.89 0.89 12.75 0.45 0.45 13.00 0.29 0.29 13.25 0.23 0.23 13.50 0.20 0.20 13.75 0.19 0.19 14.00 0.17 0.17 14.25 0.16 0.16 14.50 0.15 0.15 14.75 0.14 0.14 15.00 0.13 0.13 15.25 0.12 0.12 15.50 0.12 0.12 15.75 0.11 0.11 16.00 0.10 0.10 16.25 0.09 0.09 16.50 0.08 0.08 16.75 0.08 0.08 17.00 0.08 0.08 17.25 0.07 0.07 17.50 0.07 0.07 17.75 0.06 0.06 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.06 0.06 18.25 0.06 0.06 18.50 0.06 0.06 18.75 0.05 0.05 19.00 0.05 0.05 19.25 0.05 0.05 19.50 0.05 0.05 19.75 0.05 0.05 20.00 0.05 0.05 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 112HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.30% Impervious, Inflow Depth > 1.75" for 25yr24hr event Inflow = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af Outflow = 1.34 cfs @ 12.64 hrs, Volume= 0.190 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=1.304 ac 1.34 cfs 1.34 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 113HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.01 0.01 11.50 0.03 0.03 11.75 0.06 0.06 12.00 0.16 0.16 12.25 0.58 0.58 12.50 1.23 1.23 12.75 1.27 1.27 13.00 0.91 0.91 13.25 0.62 0.62 13.50 0.45 0.45 13.75 0.36 0.36 14.00 0.31 0.31 14.25 0.27 0.27 14.50 0.24 0.24 14.75 0.22 0.22 15.00 0.21 0.21 15.25 0.20 0.20 15.50 0.18 0.18 15.75 0.17 0.17 16.00 0.16 0.16 16.25 0.15 0.15 16.50 0.13 0.13 16.75 0.13 0.13 17.00 0.12 0.12 17.25 0.11 0.11 17.50 0.11 0.11 17.75 0.10 0.10 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.09 0.09 18.50 0.08 0.08 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.08 0.08 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.07 0.07 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 114HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.34% Impervious, Inflow Depth > 1.46" for 25yr24hr event Inflow = 2.49 cfs @ 12.37 hrs, Volume= 0.279 af Outflow = 2.49 cfs @ 12.37 hrs, Volume= 0.279 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=2.297 ac 2.49 cfs 2.49 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 115HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.00 0.00 11.25 0.00 0.00 11.50 0.02 0.02 11.75 0.09 0.09 12.00 0.47 0.47 12.25 2.14 2.14 12.50 2.20 2.20 12.75 1.31 1.31 13.00 0.78 0.78 13.25 0.57 0.57 13.50 0.48 0.48 13.75 0.43 0.43 14.00 0.40 0.40 14.25 0.36 0.36 14.50 0.34 0.34 14.75 0.32 0.32 15.00 0.30 0.30 15.25 0.28 0.28 15.50 0.26 0.26 15.75 0.25 0.25 16.00 0.23 0.23 16.25 0.21 0.21 16.50 0.19 0.19 16.75 0.18 0.18 17.00 0.17 0.17 17.25 0.17 0.17 17.50 0.16 0.16 17.75 0.15 0.15 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.14 0.14 18.25 0.13 0.13 18.50 0.12 0.12 18.75 0.12 0.12 19.00 0.12 0.12 19.25 0.12 0.12 19.50 0.11 0.11 19.75 0.11 0.11 20.00 0.11 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 116HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 28.71% Impervious, Inflow Depth > 2.00" for 25yr24hr event Inflow = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af Outflow = 3.16 cfs @ 12.34 hrs, Volume= 0.335 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)3 2 1 0 Inflow Area=2.007 ac 3.16 cfs 3.16 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 117HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.03 0.03 11.00 0.06 0.06 11.25 0.09 0.09 11.50 0.15 0.15 11.75 0.27 0.27 12.00 0.85 0.85 12.25 2.88 2.88 12.50 2.64 2.64 12.75 1.49 1.49 13.00 0.87 0.87 13.25 0.63 0.63 13.50 0.52 0.52 13.75 0.47 0.47 14.00 0.43 0.43 14.25 0.39 0.39 14.50 0.36 0.36 14.75 0.34 0.34 15.00 0.32 0.32 15.25 0.30 0.30 15.50 0.28 0.28 15.75 0.26 0.26 16.00 0.24 0.24 16.25 0.22 0.22 16.50 0.20 0.20 16.75 0.19 0.19 17.00 0.18 0.18 17.25 0.17 0.17 17.50 0.16 0.16 17.75 0.15 0.15 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.14 0.14 18.25 0.14 0.14 18.50 0.13 0.13 18.75 0.13 0.13 19.00 0.12 0.12 19.25 0.12 0.12 19.50 0.12 0.12 19.75 0.11 0.11 20.00 0.11 0.11 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 118HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.56% Impervious, Inflow Depth > 1.76" for 25yr24hr event Inflow = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af Outflow = 2.39 cfs @ 12.31 hrs, Volume= 0.245 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.667 ac 2.39 cfs 2.39 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 119HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.00 0.00 11.00 0.02 0.02 11.25 0.04 0.04 11.50 0.08 0.08 11.75 0.18 0.18 12.00 0.64 0.64 12.25 2.30 2.30 12.50 1.85 1.85 12.75 0.98 0.98 13.00 0.60 0.60 13.25 0.45 0.45 13.50 0.39 0.39 13.75 0.35 0.35 14.00 0.32 0.32 14.25 0.29 0.29 14.50 0.27 0.27 14.75 0.26 0.26 15.00 0.24 0.24 15.25 0.23 0.23 15.50 0.21 0.21 15.75 0.20 0.20 16.00 0.18 0.18 16.25 0.17 0.17 16.50 0.16 0.16 16.75 0.15 0.15 17.00 0.14 0.14 17.25 0.13 0.13 17.50 0.13 0.13 17.75 0.12 0.12 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.11 0.11 18.25 0.10 0.10 18.50 0.10 0.10 18.75 0.10 0.10 19.00 0.10 0.10 19.25 0.09 0.09 19.50 0.09 0.09 19.75 0.09 0.09 20.00 0.09 0.09 Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 120HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 26.81% Impervious, Inflow Depth > 1.93" for 25yr24hr event Inflow = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af Outflow = 5.48 cfs @ 12.22 hrs, Volume= 0.494 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)6 5 4 3 2 1 0 Inflow Area=3.075 ac 5.48 cfs 5.48 cfs Type III 24-hr 25yr24hr Rainfall=5.91"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 121HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.04 0.04 11.00 0.08 0.08 11.25 0.14 0.14 11.50 0.24 0.24 11.75 0.55 0.55 12.00 1.88 1.88 12.25 5.39 5.39 12.50 3.18 3.18 12.75 1.50 1.50 13.00 1.02 1.02 13.25 0.81 0.81 13.50 0.73 0.73 13.75 0.67 0.67 14.00 0.61 0.61 14.25 0.56 0.56 14.50 0.53 0.53 14.75 0.50 0.50 15.00 0.47 0.47 15.25 0.44 0.44 15.50 0.40 0.40 15.75 0.37 0.37 16.00 0.34 0.34 16.25 0.31 0.31 16.50 0.30 0.30 16.75 0.28 0.28 17.00 0.27 0.27 17.25 0.25 0.25 17.50 0.24 0.24 17.75 0.22 0.22 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.21 0.21 18.25 0.20 0.20 18.50 0.19 0.19 18.75 0.19 0.19 19.00 0.18 0.18 19.25 0.18 0.18 19.50 0.17 0.17 19.75 0.17 0.17 20.00 0.17 0.17 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 122HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=45,522 sf 38.62% Impervious Runoff Depth>2.76"Subcatchment 1S: SC-1 Flow Length=471' Tc=5.0 min CN=61 Runoff=3.61 cfs 0.240 af Runoff Area=16,878 sf 55.62% Impervious Runoff Depth>3.88"Subcatchment 2S: SC-2 Flow Length=316' Tc=18.0 min CN=72 Runoff=1.33 cfs 0.125 af Runoff Area=44,946 sf 22.46% Impervious Runoff Depth>2.35"Subcatchment 3S: SC-3 Flow Length=464' Tc=17.6 min CN=57 Runoff=2.11 cfs 0.202 af Runoff Area=56,816 sf 31.30% Impervious Runoff Depth>2.71"Subcatchment 4S: SC-4 Flow Length=679' Tc=42.9 min CN=61 Runoff=2.12 cfs 0.295 af Runoff Area=100,078 sf 15.34% Impervious Runoff Depth>2.35"Subcatchment 5S: SC-5 Flow Length=315' Tc=23.4 min CN=57 Runoff=4.19 cfs 0.449 af Runoff Area=87,415 sf 28.71% Impervious Runoff Depth>3.04"Subcatchment 6S: SC-6 Flow Length=520' Tc=23.1 min CN=64 Runoff=4.86 cfs 0.508 af Runoff Area=72,600 sf 20.56% Impervious Runoff Depth>2.74"Subcatchment 7S: SC-7 Flow Length=248' Tc=20.4 min CN=61 Runoff=3.81 cfs 0.381 af Runoff Area=133,967 sf 26.81% Impervious Runoff Depth>2.95"Subcatchment 8S: SC-8 Flow Length=632' Tc=15.2 min CN=63 Runoff=8.54 cfs 0.755 af Inflow=3.61 cfs 0.240 afReach 1R: AP-1 Outflow=3.61 cfs 0.240 af Inflow=1.33 cfs 0.125 afReach 2R: AP-2 Outflow=1.33 cfs 0.125 af Inflow=2.11 cfs 0.202 afReach 3R: AP-3 Outflow=2.11 cfs 0.202 af Inflow=2.12 cfs 0.295 afReach 4R: AP-4 Outflow=2.12 cfs 0.295 af Inflow=4.19 cfs 0.449 afReach 5R: AP-5 Outflow=4.19 cfs 0.449 af Inflow=4.86 cfs 0.508 afReach 6R: AP-6 Outflow=4.86 cfs 0.508 af Inflow=3.81 cfs 0.381 afReach 7R: AP-7 Outflow=3.81 cfs 0.381 af Inflow=8.54 cfs 0.755 afReach 8R: AP-8 Outflow=8.54 cfs 0.755 af Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 123HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Total Runoff Area = 12.815 ac Runoff Volume = 2.956 af Average Runoff Depth = 2.77" 73.82% Pervious = 9.460 ac 26.18% Impervious = 3.355 ac Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 124HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: SC-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af, Depth> 2.76" Routed to Reach 1R : AP-1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description 11,163 36 Woods, Fair, HSG A 22,370 54 1/2 acre lots, 25% imp, HSG A 11,989 98 Paved parking, HSG A 45,522 61 Weighted Average 27,941 61.38% Pervious Area 17,582 38.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.6 100 0.0100 1.07 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 1.6 154 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 0.9 85 0.0120 1.64 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.7 132 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 4.8 471 Total, Increased to minimum Tc = 5.0 min Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 125HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 1S: SC-1 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=45,522 sf Runoff Volume=0.240 af Runoff Depth>2.76" Flow Length=471' Tc=5.0 min CN=61 3.61 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 126HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: SC-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.01 10.25 1.49 0.01 0.02 10.50 1.60 0.02 0.04 10.75 1.72 0.03 0.06 11.00 1.85 0.05 0.08 11.25 2.01 0.07 0.13 11.50 2.21 0.12 0.19 11.75 2.63 0.24 0.61 12.00 3.70 0.67 2.23 12.25 4.77 1.23 1.82 12.50 5.19 1.49 0.89 12.75 5.39 1.61 0.50 13.00 5.55 1.71 0.40 13.25 5.68 1.79 0.35 13.50 5.80 1.87 0.32 13.75 5.91 1.94 0.29 14.00 6.00 2.01 0.26 14.25 6.09 2.07 0.25 14.50 6.17 2.12 0.23 14.75 6.25 2.17 0.22 15.00 6.32 2.22 0.21 15.25 6.39 2.27 0.19 15.50 6.45 2.31 0.18 15.75 6.51 2.35 0.16 16.00 6.56 2.39 0.15 16.25 6.60 2.42 0.14 16.50 6.65 2.45 0.13 16.75 6.69 2.48 0.12 17.00 6.73 2.51 0.12 17.25 6.77 2.54 0.11 17.50 6.80 2.56 0.10 17.75 6.84 2.58 0.10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.09 18.25 6.90 2.63 0.09 18.50 6.93 2.65 0.09 18.75 6.95 2.67 0.08 19.00 6.98 2.69 0.08 19.25 7.01 2.71 0.08 19.50 7.03 2.73 0.08 19.75 7.06 2.74 0.08 20.00 7.08 2.76 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 127HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: SC-2 Runoff = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af, Depth> 3.88" Routed to Reach 2R : AP-2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description 1,268 36 Woods, Fair, HSG A 8,297 54 1/2 acre lots, 25% imp, HSG A 7,313 98 Paved parking, HSG A 16,878 72 Weighted Average 7,491 44.38% Pervious Area 9,387 55.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 78 0.0130 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.5 22 0.0090 0.76 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 4.0 216 0.0020 0.91 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 18.0 316 Total Subcatchment 2S: SC-2 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=16,878 sf Runoff Volume=0.125 af Runoff Depth>3.88" Flow Length=316' Tc=18.0 min CN=72 1.33 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 128HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: SC-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.01 0.00 8.75 1.01 0.01 0.01 9.00 1.08 0.02 0.01 9.25 1.15 0.03 0.01 9.50 1.23 0.05 0.02 9.75 1.31 0.06 0.02 10.00 1.40 0.09 0.03 10.25 1.49 0.11 0.04 10.50 1.60 0.14 0.04 10.75 1.72 0.18 0.06 11.00 1.85 0.23 0.07 11.25 2.01 0.29 0.08 11.50 2.21 0.38 0.11 11.75 2.63 0.60 0.20 12.00 3.70 1.25 0.52 12.25 4.77 2.02 1.33 12.50 5.19 2.35 0.82 12.75 5.39 2.51 0.39 13.00 5.55 2.63 0.24 13.25 5.68 2.73 0.18 13.50 5.80 2.83 0.16 13.75 5.91 2.92 0.14 14.00 6.00 2.99 0.13 14.25 6.09 3.07 0.12 14.50 6.17 3.13 0.11 14.75 6.25 3.20 0.10 15.00 6.32 3.26 0.10 15.25 6.39 3.31 0.09 15.50 6.45 3.36 0.08 15.75 6.51 3.41 0.08 16.00 6.56 3.45 0.07 16.25 6.60 3.49 0.06 16.50 6.65 3.53 0.06 16.75 6.69 3.57 0.06 17.00 6.73 3.60 0.05 17.25 6.77 3.63 0.05 17.50 6.80 3.66 0.05 17.75 6.84 3.69 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 3.72 0.04 18.25 6.90 3.74 0.04 18.50 6.93 3.77 0.04 18.75 6.95 3.79 0.04 19.00 6.98 3.81 0.04 19.25 7.01 3.83 0.04 19.50 7.03 3.86 0.03 19.75 7.06 3.88 0.03 20.00 7.08 3.90 0.03 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 129HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: SC-3 Runoff = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af, Depth> 2.35" Routed to Reach 3R : AP-3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 17,794 36 * 17,056 54 * 10,096 98 44,946 57 Weighted Average 34,850 77.54% Pervious Area 10,096 22.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 110 0.0260 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.7 20 0.0100 0.50 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.0 10 0.0900 4.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.4 324 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 17.6 464 Total Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 130HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: SC-3 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=44,946 sf Runoff Volume=0.202 af Runoff Depth>2.35" Flow Length=464' Tc=17.6 min CN=57 2.11 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 131HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: SC-3 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.00 0.00 10.50 1.60 0.00 0.00 10.75 1.72 0.01 0.01 11.00 1.85 0.01 0.03 11.25 2.01 0.03 0.05 11.50 2.21 0.06 0.09 11.75 2.63 0.14 0.19 12.00 3.70 0.49 0.65 12.25 4.77 0.98 2.11 12.50 5.19 1.21 1.41 12.75 5.39 1.32 0.70 13.00 5.55 1.41 0.45 13.25 5.68 1.48 0.34 13.50 5.80 1.55 0.31 13.75 5.91 1.62 0.28 14.00 6.00 1.68 0.26 14.25 6.09 1.73 0.23 14.50 6.17 1.78 0.22 14.75 6.25 1.83 0.21 15.00 6.32 1.87 0.19 15.25 6.39 1.92 0.18 15.50 6.45 1.96 0.17 15.75 6.51 1.99 0.16 16.00 6.56 2.02 0.14 16.25 6.60 2.05 0.13 16.50 6.65 2.08 0.12 16.75 6.69 2.11 0.12 17.00 6.73 2.14 0.11 17.25 6.77 2.16 0.11 17.50 6.80 2.18 0.10 17.75 6.84 2.21 0.09 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.23 0.09 18.25 6.90 2.24 0.08 18.50 6.93 2.26 0.08 18.75 6.95 2.28 0.08 19.00 6.98 2.30 0.08 19.25 7.01 2.32 0.07 19.50 7.03 2.33 0.07 19.75 7.06 2.35 0.07 20.00 7.08 2.37 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 132HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: SC-4 Runoff = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af, Depth> 2.71" Routed to Reach 4R : AP-4 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 21,624 36 * 17,411 54 * 17,781 98 56,816 61 Weighted Average 39,035 68.70% Pervious Area 17,781 31.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 26.5 100 0.0110 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 4.5 120 0.0080 0.45 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 0.8 60 0.0070 1.25 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 27 0.0190 2.80 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 7.7 73 0.0010 0.16 Shallow Concentrated Flow, Forest Woodland Kv= 5.0 fps 3.2 299 0.0060 1.57 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 42.9 679 Total Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 133HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 4S: SC-4 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=56,816 sf Runoff Volume=0.295 af Runoff Depth>2.71" Flow Length=679' Tc=42.9 min CN=61 2.12 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 134HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: SC-4 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.01 0.00 10.50 1.60 0.02 0.01 10.75 1.72 0.03 0.03 11.00 1.85 0.05 0.05 11.25 2.01 0.07 0.07 11.50 2.21 0.12 0.10 11.75 2.63 0.24 0.16 12.00 3.70 0.67 0.34 12.25 4.77 1.23 1.03 12.50 5.19 1.49 2.00 12.75 5.39 1.61 1.99 13.00 5.55 1.71 1.39 13.25 5.68 1.79 0.93 13.50 5.80 1.87 0.67 13.75 5.91 1.94 0.53 14.00 6.00 2.01 0.45 14.25 6.09 2.07 0.39 14.50 6.17 2.12 0.35 14.75 6.25 2.17 0.32 15.00 6.32 2.22 0.30 15.25 6.39 2.27 0.28 15.50 6.45 2.31 0.26 15.75 6.51 2.35 0.24 16.00 6.56 2.39 0.23 16.25 6.60 2.42 0.21 16.50 6.65 2.45 0.19 16.75 6.69 2.48 0.18 17.00 6.73 2.51 0.17 17.25 6.77 2.54 0.16 17.50 6.80 2.56 0.15 17.75 6.84 2.58 0.14 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.13 18.25 6.90 2.63 0.13 18.50 6.93 2.65 0.12 18.75 6.95 2.67 0.11 19.00 6.98 2.69 0.11 19.25 7.01 2.71 0.11 19.50 7.03 2.73 0.10 19.75 7.06 2.74 0.10 20.00 7.08 2.76 0.10 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 135HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: SC-5 Runoff = 4.19 cfs @ 12.35 hrs, Volume= 0.449 af, Depth> 2.35" Routed to Reach 5R : AP-5 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 20,625 36 * 64,101 54 * 15,352 98 100,078 57 Weighted Average 84,726 84.66% Pervious Area 15,352 15.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 19 0.0260 0.10 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 8.2 42 0.0360 0.08 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 9.4 39 0.0080 0.07 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.1 10 0.0100 1.50 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 2.4 205 0.0050 1.44 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.4 315 Total Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 136HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 5S: SC-5 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=100,078 sf Runoff Volume=0.449 af Runoff Depth>2.35" Flow Length=315' Tc=23.4 min CN=57 4.19 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 137HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 5S: SC-5 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.00 0.00 10.50 1.60 0.00 0.00 10.75 1.72 0.01 0.02 11.00 1.85 0.01 0.05 11.25 2.01 0.03 0.09 11.50 2.21 0.06 0.16 11.75 2.63 0.14 0.32 12.00 3.70 0.49 1.05 12.25 4.77 0.98 3.75 12.50 5.19 1.21 3.57 12.75 5.39 1.32 2.04 13.00 5.55 1.41 1.20 13.25 5.68 1.48 0.86 13.50 5.80 1.55 0.72 13.75 5.91 1.62 0.65 14.00 6.00 1.68 0.59 14.25 6.09 1.73 0.54 14.50 6.17 1.78 0.50 14.75 6.25 1.83 0.47 15.00 6.32 1.87 0.44 15.25 6.39 1.92 0.42 15.50 6.45 1.96 0.39 15.75 6.51 1.99 0.36 16.00 6.56 2.02 0.33 16.25 6.60 2.05 0.30 16.50 6.65 2.08 0.28 16.75 6.69 2.11 0.27 17.00 6.73 2.14 0.25 17.25 6.77 2.16 0.24 17.50 6.80 2.18 0.23 17.75 6.84 2.21 0.21 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.23 0.20 18.25 6.90 2.24 0.19 18.50 6.93 2.26 0.18 18.75 6.95 2.28 0.17 19.00 6.98 2.30 0.17 19.25 7.01 2.32 0.17 19.50 7.03 2.33 0.16 19.75 7.06 2.35 0.16 20.00 7.08 2.37 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 138HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: SC-6 Runoff = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af, Depth> 3.04" Routed to Reach 6R : AP-6 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 14,520 36 * 47,798 54 * 25,097 98 87,415 64 Weighted Average 62,318 71.29% Pervious Area 25,097 28.71% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 79 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 0.3 21 0.0240 1.11 Sheet Flow, Impervious Smooth surfaces n= 0.011 P2= 3.39" 2.3 420 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 23.1 520 Total Subcatchment 6S: SC-6 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)5 4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=87,415 sf Runoff Volume=0.508 af Runoff Depth>3.04" Flow Length=520' Tc=23.1 min CN=64 4.86 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 139HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: SC-6 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.01 0.02 10.00 1.40 0.01 0.04 10.25 1.49 0.02 0.06 10.50 1.60 0.04 0.09 10.75 1.72 0.06 0.12 11.00 1.85 0.08 0.16 11.25 2.01 0.12 0.22 11.50 2.21 0.17 0.32 11.75 2.63 0.32 0.53 12.00 3.70 0.81 1.48 12.25 4.77 1.43 4.51 12.50 5.19 1.71 3.96 12.75 5.39 1.84 2.18 13.00 5.55 1.95 1.25 13.25 5.68 2.04 0.89 13.50 5.80 2.12 0.74 13.75 5.91 2.20 0.67 14.00 6.00 2.26 0.61 14.25 6.09 2.33 0.55 14.50 6.17 2.39 0.51 14.75 6.25 2.44 0.48 15.00 6.32 2.50 0.45 15.25 6.39 2.54 0.42 15.50 6.45 2.59 0.39 15.75 6.51 2.63 0.36 16.00 6.56 2.67 0.33 16.25 6.60 2.70 0.30 16.50 6.65 2.74 0.28 16.75 6.69 2.77 0.27 17.00 6.73 2.80 0.25 17.25 6.77 2.83 0.24 17.50 6.80 2.85 0.23 17.75 6.84 2.88 0.21 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.90 0.20 18.25 6.90 2.92 0.19 18.50 6.93 2.94 0.18 18.75 6.95 2.97 0.17 19.00 6.98 2.99 0.17 19.25 7.01 3.01 0.17 19.50 7.03 3.03 0.16 19.75 7.06 3.05 0.16 20.00 7.08 3.06 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 140HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: SC-7 Runoff = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af, Depth> 2.74" Routed to Reach 7R : AP-7 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 7,201 36 * 50,476 54 * 14,923 98 72,600 61 Weighted Average 57,677 79.44% Pervious Area 14,923 20.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.9 44 0.0130 0.06 Sheet Flow, Forest Woods: Light underbrush n= 0.400 P2= 3.39" 6.9 56 0.0360 0.14 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.4 104 0.0770 4.16 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 0.2 44 0.0230 3.08 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 20.4 248 Total Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 141HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Subcatchment 7S: SC-7 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=72,600 sf Runoff Volume=0.381 af Runoff Depth>2.74" Flow Length=248' Tc=20.4 min CN=61 3.81 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 142HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: SC-7 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.00 10.00 1.40 0.00 0.00 10.25 1.49 0.01 0.02 10.50 1.60 0.02 0.04 10.75 1.72 0.03 0.06 11.00 1.85 0.05 0.10 11.25 2.01 0.07 0.14 11.50 2.21 0.12 0.21 11.75 2.63 0.24 0.39 12.00 3.70 0.67 1.18 12.25 4.77 1.23 3.70 12.50 5.19 1.49 2.83 12.75 5.39 1.61 1.47 13.00 5.55 1.71 0.88 13.25 5.68 1.79 0.65 13.50 5.80 1.87 0.56 13.75 5.91 1.94 0.51 14.00 6.00 2.01 0.47 14.25 6.09 2.07 0.42 14.50 6.17 2.12 0.39 14.75 6.25 2.17 0.37 15.00 6.32 2.22 0.35 15.25 6.39 2.27 0.33 15.50 6.45 2.31 0.30 15.75 6.51 2.35 0.28 16.00 6.56 2.39 0.26 16.25 6.60 2.42 0.23 16.50 6.65 2.45 0.22 16.75 6.69 2.48 0.21 17.00 6.73 2.51 0.20 17.25 6.77 2.54 0.19 17.50 6.80 2.56 0.18 17.75 6.84 2.58 0.17 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.61 0.16 18.25 6.90 2.63 0.15 18.50 6.93 2.65 0.14 18.75 6.95 2.67 0.14 19.00 6.98 2.69 0.13 19.25 7.01 2.71 0.13 19.50 7.03 2.73 0.13 19.75 7.06 2.74 0.12 20.00 7.08 2.76 0.12 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 143HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: SC-8 Runoff = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af, Depth> 2.95" Routed to Reach 8R : AP-8 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100yr24hr Rainfall=7.40" Area (sf) CN Description * 19,294 36 * 78,756 54 * 35,917 98 133,967 63 Weighted Average 98,050 73.19% Pervious Area 35,917 26.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.1 100 0.0350 0.15 Sheet Flow, Res. Lots Grass: Dense n= 0.240 P2= 3.39" 0.8 132 0.0340 2.77 Shallow Concentrated Flow, Res. Lots Grassed Waterway Kv= 15.0 fps 3.3 400 0.0100 2.03 Shallow Concentrated Flow, Impervious Paved Kv= 20.3 fps 15.2 632 Total Subcatchment 8S: SC-8 Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)9 8 7 6 5 4 3 2 1 0 Type III 24-hr 100yr24hr Rainfall=7.40" Runoff Area=133,967 sf Runoff Volume=0.755 af Runoff Depth>2.95" Flow Length=632' Tc=15.2 min CN=63 8.54 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 144HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: SC-8 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.42 0.00 0.00 5.25 0.45 0.00 0.00 5.50 0.47 0.00 0.00 5.75 0.50 0.00 0.00 6.00 0.53 0.00 0.00 6.25 0.56 0.00 0.00 6.50 0.60 0.00 0.00 6.75 0.63 0.00 0.00 7.00 0.67 0.00 0.00 7.25 0.71 0.00 0.00 7.50 0.75 0.00 0.00 7.75 0.80 0.00 0.00 8.00 0.84 0.00 0.00 8.25 0.89 0.00 0.00 8.50 0.95 0.00 0.00 8.75 1.01 0.00 0.00 9.00 1.08 0.00 0.00 9.25 1.15 0.00 0.00 9.50 1.23 0.00 0.00 9.75 1.31 0.00 0.02 10.00 1.40 0.01 0.05 10.25 1.49 0.02 0.09 10.50 1.60 0.03 0.13 10.75 1.72 0.05 0.19 11.00 1.85 0.07 0.26 11.25 2.01 0.10 0.35 11.50 2.21 0.15 0.53 11.75 2.63 0.29 1.08 12.00 3.70 0.76 3.22 12.25 4.77 1.37 8.32 12.50 5.19 1.63 4.71 12.75 5.39 1.76 2.18 13.00 5.55 1.87 1.47 13.25 5.68 1.96 1.16 13.50 5.80 2.04 1.04 13.75 5.91 2.11 0.96 14.00 6.00 2.18 0.87 14.25 6.09 2.24 0.79 14.50 6.17 2.30 0.74 14.75 6.25 2.35 0.70 15.00 6.32 2.40 0.66 15.25 6.39 2.45 0.61 15.50 6.45 2.50 0.57 15.75 6.51 2.54 0.52 16.00 6.56 2.57 0.48 16.25 6.60 2.61 0.44 16.50 6.65 2.64 0.41 16.75 6.69 2.67 0.39 17.00 6.73 2.70 0.37 17.25 6.77 2.73 0.35 17.50 6.80 2.75 0.33 17.75 6.84 2.78 0.31 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 6.87 2.80 0.29 18.25 6.90 2.82 0.27 18.50 6.93 2.84 0.27 18.75 6.95 2.87 0.26 19.00 6.98 2.89 0.25 19.25 7.01 2.91 0.25 19.50 7.03 2.93 0.24 19.75 7.06 2.94 0.24 20.00 7.08 2.96 0.23 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 145HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 1R: AP-1 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.045 ac, 38.62% Impervious, Inflow Depth > 2.76" for 100yr24hr event Inflow = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af Outflow = 3.61 cfs @ 12.08 hrs, Volume= 0.240 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 1R: AP-1 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=1.045 ac 3.61 cfs 3.61 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 146HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 1R: AP-1 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.01 0.01 10.25 0.02 0.02 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.08 0.08 11.25 0.13 0.13 11.50 0.19 0.19 11.75 0.61 0.61 12.00 2.23 2.23 12.25 1.82 1.82 12.50 0.89 0.89 12.75 0.50 0.50 13.00 0.40 0.40 13.25 0.35 0.35 13.50 0.32 0.32 13.75 0.29 0.29 14.00 0.26 0.26 14.25 0.25 0.25 14.50 0.23 0.23 14.75 0.22 0.22 15.00 0.21 0.21 15.25 0.19 0.19 15.50 0.18 0.18 15.75 0.16 0.16 16.00 0.15 0.15 16.25 0.14 0.14 16.50 0.13 0.13 16.75 0.12 0.12 17.00 0.12 0.12 17.25 0.11 0.11 17.50 0.10 0.10 17.75 0.10 0.10 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.09 0.09 18.50 0.09 0.09 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.08 0.08 19.50 0.08 0.08 19.75 0.08 0.08 20.00 0.07 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 147HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 2R: AP-2 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.387 ac, 55.62% Impervious, Inflow Depth > 3.88" for 100yr24hr event Inflow = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af Outflow = 1.33 cfs @ 12.25 hrs, Volume= 0.125 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 2R: AP-2 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)1 0 Inflow Area=0.387 ac 1.33 cfs 1.33 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 148HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 2R: AP-2 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.01 0.01 9.00 0.01 0.01 9.25 0.01 0.01 9.50 0.02 0.02 9.75 0.02 0.02 10.00 0.03 0.03 10.25 0.04 0.04 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.07 0.07 11.25 0.08 0.08 11.50 0.11 0.11 11.75 0.20 0.20 12.00 0.52 0.52 12.25 1.33 1.33 12.50 0.82 0.82 12.75 0.39 0.39 13.00 0.24 0.24 13.25 0.18 0.18 13.50 0.16 0.16 13.75 0.14 0.14 14.00 0.13 0.13 14.25 0.12 0.12 14.50 0.11 0.11 14.75 0.10 0.10 15.00 0.10 0.10 15.25 0.09 0.09 15.50 0.08 0.08 15.75 0.08 0.08 16.00 0.07 0.07 16.25 0.06 0.06 16.50 0.06 0.06 16.75 0.06 0.06 17.00 0.05 0.05 17.25 0.05 0.05 17.50 0.05 0.05 17.75 0.05 0.05 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.04 0.04 18.25 0.04 0.04 18.50 0.04 0.04 18.75 0.04 0.04 19.00 0.04 0.04 19.25 0.04 0.04 19.50 0.03 0.03 19.75 0.03 0.03 20.00 0.03 0.03 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 149HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: AP-3 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.032 ac, 22.46% Impervious, Inflow Depth > 2.35" for 100yr24hr event Inflow = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af Outflow = 2.11 cfs @ 12.26 hrs, Volume= 0.202 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 3R: AP-3 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.032 ac 2.11 cfs 2.11 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 150HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: AP-3 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.01 0.01 11.00 0.03 0.03 11.25 0.05 0.05 11.50 0.09 0.09 11.75 0.19 0.19 12.00 0.65 0.65 12.25 2.11 2.11 12.50 1.41 1.41 12.75 0.70 0.70 13.00 0.45 0.45 13.25 0.34 0.34 13.50 0.31 0.31 13.75 0.28 0.28 14.00 0.26 0.26 14.25 0.23 0.23 14.50 0.22 0.22 14.75 0.21 0.21 15.00 0.19 0.19 15.25 0.18 0.18 15.50 0.17 0.17 15.75 0.16 0.16 16.00 0.14 0.14 16.25 0.13 0.13 16.50 0.12 0.12 16.75 0.12 0.12 17.00 0.11 0.11 17.25 0.11 0.11 17.50 0.10 0.10 17.75 0.09 0.09 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.09 0.09 18.25 0.08 0.08 18.50 0.08 0.08 18.75 0.08 0.08 19.00 0.08 0.08 19.25 0.07 0.07 19.50 0.07 0.07 19.75 0.07 0.07 20.00 0.07 0.07 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 151HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: AP-4 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.304 ac, 31.30% Impervious, Inflow Depth > 2.71" for 100yr24hr event Inflow = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af Outflow = 2.12 cfs @ 12.62 hrs, Volume= 0.295 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 4R: AP-4 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Inflow Area=1.304 ac 2.12 cfs 2.12 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 152HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: AP-4 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.01 0.01 10.75 0.03 0.03 11.00 0.05 0.05 11.25 0.07 0.07 11.50 0.10 0.10 11.75 0.16 0.16 12.00 0.34 0.34 12.25 1.03 1.03 12.50 2.00 2.00 12.75 1.99 1.99 13.00 1.39 1.39 13.25 0.93 0.93 13.50 0.67 0.67 13.75 0.53 0.53 14.00 0.45 0.45 14.25 0.39 0.39 14.50 0.35 0.35 14.75 0.32 0.32 15.00 0.30 0.30 15.25 0.28 0.28 15.50 0.26 0.26 15.75 0.24 0.24 16.00 0.23 0.23 16.25 0.21 0.21 16.50 0.19 0.19 16.75 0.18 0.18 17.00 0.17 0.17 17.25 0.16 0.16 17.50 0.15 0.15 17.75 0.14 0.14 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.13 0.13 18.25 0.13 0.13 18.50 0.12 0.12 18.75 0.11 0.11 19.00 0.11 0.11 19.25 0.11 0.11 19.50 0.10 0.10 19.75 0.10 0.10 20.00 0.10 0.10 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 153HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: AP-5 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.297 ac, 15.34% Impervious, Inflow Depth > 2.35" for 100yr24hr event Inflow = 4.19 cfs @ 12.35 hrs, Volume= 0.449 af Outflow = 4.19 cfs @ 12.35 hrs, Volume= 0.449 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 5R: AP-5 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=2.297 ac 4.19 cfs 4.19 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 154HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 5R: AP-5 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.00 0.00 10.50 0.00 0.00 10.75 0.02 0.02 11.00 0.05 0.05 11.25 0.09 0.09 11.50 0.16 0.16 11.75 0.32 0.32 12.00 1.05 1.05 12.25 3.75 3.75 12.50 3.57 3.57 12.75 2.04 2.04 13.00 1.20 1.20 13.25 0.86 0.86 13.50 0.72 0.72 13.75 0.65 0.65 14.00 0.59 0.59 14.25 0.54 0.54 14.50 0.50 0.50 14.75 0.47 0.47 15.00 0.44 0.44 15.25 0.42 0.42 15.50 0.39 0.39 15.75 0.36 0.36 16.00 0.33 0.33 16.25 0.30 0.30 16.50 0.28 0.28 16.75 0.27 0.27 17.00 0.25 0.25 17.25 0.24 0.24 17.50 0.23 0.23 17.75 0.21 0.21 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.20 0.20 18.25 0.19 0.19 18.50 0.18 0.18 18.75 0.17 0.17 19.00 0.17 0.17 19.25 0.17 0.17 19.50 0.16 0.16 19.75 0.16 0.16 20.00 0.15 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 155HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: AP-6 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.007 ac, 28.71% Impervious, Inflow Depth > 3.04" for 100yr24hr event Inflow = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af Outflow = 4.86 cfs @ 12.33 hrs, Volume= 0.508 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 6R: AP-6 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)5 4 3 2 1 0 Inflow Area=2.007 ac 4.86 cfs 4.86 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 156HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 6R: AP-6 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.02 0.02 10.00 0.04 0.04 10.25 0.06 0.06 10.50 0.09 0.09 10.75 0.12 0.12 11.00 0.16 0.16 11.25 0.22 0.22 11.50 0.32 0.32 11.75 0.53 0.53 12.00 1.48 1.48 12.25 4.51 4.51 12.50 3.96 3.96 12.75 2.18 2.18 13.00 1.25 1.25 13.25 0.89 0.89 13.50 0.74 0.74 13.75 0.67 0.67 14.00 0.61 0.61 14.25 0.55 0.55 14.50 0.51 0.51 14.75 0.48 0.48 15.00 0.45 0.45 15.25 0.42 0.42 15.50 0.39 0.39 15.75 0.36 0.36 16.00 0.33 0.33 16.25 0.30 0.30 16.50 0.28 0.28 16.75 0.27 0.27 17.00 0.25 0.25 17.25 0.24 0.24 17.50 0.23 0.23 17.75 0.21 0.21 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.20 0.20 18.25 0.19 0.19 18.50 0.18 0.18 18.75 0.17 0.17 19.00 0.17 0.17 19.25 0.17 0.17 19.50 0.16 0.16 19.75 0.16 0.16 20.00 0.15 0.15 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 157HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 7R: AP-7 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.667 ac, 20.56% Impervious, Inflow Depth > 2.74" for 100yr24hr event Inflow = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af Outflow = 3.81 cfs @ 12.30 hrs, Volume= 0.381 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 7R: AP-7 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)4 3 2 1 0 Inflow Area=1.667 ac 3.81 cfs 3.81 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 158HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 7R: AP-7 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.00 0.00 10.00 0.00 0.00 10.25 0.02 0.02 10.50 0.04 0.04 10.75 0.06 0.06 11.00 0.10 0.10 11.25 0.14 0.14 11.50 0.21 0.21 11.75 0.39 0.39 12.00 1.18 1.18 12.25 3.70 3.70 12.50 2.83 2.83 12.75 1.47 1.47 13.00 0.88 0.88 13.25 0.65 0.65 13.50 0.56 0.56 13.75 0.51 0.51 14.00 0.47 0.47 14.25 0.42 0.42 14.50 0.39 0.39 14.75 0.37 0.37 15.00 0.35 0.35 15.25 0.33 0.33 15.50 0.30 0.30 15.75 0.28 0.28 16.00 0.26 0.26 16.25 0.23 0.23 16.50 0.22 0.22 16.75 0.21 0.21 17.00 0.20 0.20 17.25 0.19 0.19 17.50 0.18 0.18 17.75 0.17 0.17 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.16 0.16 18.25 0.15 0.15 18.50 0.14 0.14 18.75 0.14 0.14 19.00 0.13 0.13 19.25 0.13 0.13 19.50 0.13 0.13 19.75 0.12 0.12 20.00 0.12 0.12 Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 159HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Summary for Reach 8R: AP-8 [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 3.075 ac, 26.81% Impervious, Inflow Depth > 2.95" for 100yr24hr event Inflow = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af Outflow = 8.54 cfs @ 12.22 hrs, Volume= 0.755 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Reach 8R: AP-8 Inflow Outflow Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=3.075 ac 8.54 cfs 8.54 cfs Type III 24-hr 100yr24hr Rainfall=7.40"Proposed_GosnoldSt Printed 1/12/2024Prepared by Apex Companies Page 160HydroCAD® 10.20-3c s/n 04622 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 8R: AP-8 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 5.00 0.00 0.00 5.25 0.00 0.00 5.50 0.00 0.00 5.75 0.00 0.00 6.00 0.00 0.00 6.25 0.00 0.00 6.50 0.00 0.00 6.75 0.00 0.00 7.00 0.00 0.00 7.25 0.00 0.00 7.50 0.00 0.00 7.75 0.00 0.00 8.00 0.00 0.00 8.25 0.00 0.00 8.50 0.00 0.00 8.75 0.00 0.00 9.00 0.00 0.00 9.25 0.00 0.00 9.50 0.00 0.00 9.75 0.02 0.02 10.00 0.05 0.05 10.25 0.09 0.09 10.50 0.13 0.13 10.75 0.19 0.19 11.00 0.26 0.26 11.25 0.35 0.35 11.50 0.53 0.53 11.75 1.08 1.08 12.00 3.22 3.22 12.25 8.32 8.32 12.50 4.71 4.71 12.75 2.18 2.18 13.00 1.47 1.47 13.25 1.16 1.16 13.50 1.04 1.04 13.75 0.96 0.96 14.00 0.87 0.87 14.25 0.79 0.79 14.50 0.74 0.74 14.75 0.70 0.70 15.00 0.66 0.66 15.25 0.61 0.61 15.50 0.57 0.57 15.75 0.52 0.52 16.00 0.48 0.48 16.25 0.44 0.44 16.50 0.41 0.41 16.75 0.39 0.39 17.00 0.37 0.37 17.25 0.35 0.35 17.50 0.33 0.33 17.75 0.31 0.31 Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 18.00 0.29 0.29 18.25 0.27 0.27 18.50 0.27 0.27 18.75 0.26 0.26 19.00 0.25 0.25 19.25 0.25 0.25 19.50 0.24 0.24 19.75 0.24 0.24 20.00 0.23 0.23 ATTACHMENT 7 MASSDEP TSS REMOVAL WORKSHEET INSTRUCTIONS:Version 1, Automated: Mar. 4, 2008 1. In BMP Column, click on Blue Cell to Activate Drop Down Menu 2. Select BMP from Drop Down Menu 3. After BMP is selected, TSS Removal and other Columns are automatically completed. Location: B C D E F TSS Removal Starting TSS Amount Remaining BMP1 Rate1 Load* Removed (C*D) Load (D-E) Street Sweeping - 10%0.10 1.00 0.10 0.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total TSS Removal =10% Separate Form Needs to be Completed for Each Outlet or BMP Train Project:Gosnold Street Prepared By:LKH *Equals remaining load from previous BMP (E) Date:1/12/2024 which enters the BMP Treatment Prior to Discharge TSS Removal Calculation Worksheet ATTACHMENT 8 ILLICIT DISCHARGE COMPLIANCE STATEMENT Stormwater Report Gosnold St Improvements Town of Barnstable, MA ILLICIT DISCHARGE COMPLIANCE STATEMENT To the best of my knowledge, there are no known illicit discharge connections to the drainage system along Gosnold within the project limits. Any illicit discharges identified prior to construction will be addressed immediately. No new illicit discharges are expected to occur as a result of this work. I hereby certify that the preceding is accurate. Ryan J. Paul, PE Environmental Partners Group, Inc. 1900 Crown Colony Drive, Suite 402 Quincy, MA 02169 P: 617.657.0200 F: 617.657.0201 envpartners.com