Loading...
HomeMy WebLinkAboutDefinitive Subdivision_HydroCAD ReportPR1ROADWAYPR2Lots 3 & 41PSubsurface SystemRouting Diagram for 4857103-SUBDIVISIONPrepared by BSC Group, Printed 8/28/2026HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSubcatReachPondLinkSUBDIVISION4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 2HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCRainfall Events ListingEvent# EventNameStorm Type Curve Mode Duration(hours)B/B Depth(inches)AMC1 2-year NOAA10 24-hr C Default 24.00 1 3.39 22 10-year NOAA10 24-hr C Default 24.00 1 4.94 23 25-year NOAA10 24-hr C Default 24.00 1 5.91 24 100-year NOAA10 24-hr C Default 24.00 1 7.40 2 SUBDIVISION4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 3HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCArea Listing (all nodes)Area(sq-ft)CN Description(subcatchment-numbers)2,953 39 >75% Grass cover, Good, HSG A (PR2)2,440 98 Paved parking, HSG A (PR1, PR2)5,393 66 TOTAL AREASUBDIVISION4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 4HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSoil Listing (all nodes)Area(sq-ft)SoilGroupSubcatchmentNumbers5,393 HSG A PR1, PR20 HSG B0 HSG C0 HSG D0 Other5,393 TOTAL AREA SUBDIVISION4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 5HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCGround Covers (all nodes)HSG-A(sq-ft)HSG-B(sq-ft)HSG-C(sq-ft)HSG-D(sq-ft)Other(sq-ft)Total(sq-ft)GroundCoverSubcatchmentNumbers2,953 0 0 0 0 2,953 >75% Grass cover, Good2,440 0 0 0 0 2,440 Paved parking5,393 0 0 0 0 5,393 TOTAL AREASUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 6HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCTime span=0.00-72.00 hrs, dt=0.01 hrs, 7201 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1,990 sf 100.00% Impervious Runoff Depth=3.16"Subcatchment PR1: ROADWAY Tc=6.0 min CN=98 Runoff=0.18 cfs 524 cfRunoff Area=3,403 sf 13.22% Impervious Runoff Depth=0.10"Subcatchment PR2: Lots 3 & 4 Tc=6.0 min CN=47 Runoff=0.00 cfs 29 cfPeak Elev=30.04' Storage=73 cf Inflow=0.18 cfs 553 cfPond 1P: Subsurface System Outflow=0.05 cfs 553 cfTotal Runoff Area = 5,393 sf Runoff Volume = 553 cf Average Runoff Depth = 1.23"54.76% Pervious = 2,953 sf 45.24% Impervious = 2,440 sf SUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 7HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR1: ROADWAYRunoff = 0.18 cfs @ 12.13 hrs, Volume= 524 cf, Depth= 3.16" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 2-year Rainfall=3.39"Area (sf) CN Description1,990 98 Paved parking, HSG A1,990 100.00% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR1: ROADWAYRunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.20.190.180.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010NOAA10 24-hr C2-year Rainfall=3.39"Runoff Area=1,990 sfRunoff Volume=524 cfRunoff Depth=3.16"Tc=6.0 minCN=98 0.18 cfs SUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 8HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR2: Lots 3 & 4Runoff = 0.00 cfs @ 15.02 hrs, Volume= 29 cf, Depth= 0.10" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 2-year Rainfall=3.39"Area (sf) CN Description450 98 Paved parking, HSG A2,953 39 >75% Grass cover, Good, HSG A3,403 47 Weighted Average2,953 86.78% Pervious Area450 13.22% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR2: Lots 3 & 4RunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0000.0000.0000.0000.0000.0000.000000NOAA10 24-hr C2-year Rainfall=3.39"Runoff Area=3,403 sfRunoff Volume=29 cfRunoff Depth=0.10"Tc=6.0 minCN=47 0.00 cfs SUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 9HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Pond 1P: Subsurface SystemInflow Area = 5,393 sf, 45.24% Impervious, Inflow Depth = 1.23" for 2-year eventInflow = 0.18 cfs @ 12.13 hrs, Volume= 553 cfOutflow = 0.05 cfs @ 11.96 hrs, Volume= 553 cf, Atten= 70%, Lag= 0.0 minDiscarded = 0.05 cfs @ 11.96 hrs, Volume= 553 cfRouting by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsPeak Elev= 30.04' @ 12.28 hrs Surf.Area= 280 sf Storage= 73 cfPlug-Flow detention time= 5.1 min calculated for 553 cf (100% of inflow)Center-of-Mass det. time= 5.1 min ( 779.2 - 774.0 )Volume Invert Avail.Storage Storage Description#1A 29.46' 274 cf15.75'W x 17.77'L x 3.50'H Field A979 cf Overall - 293 cf Embedded = 686 cf x 40.0% Voids#2A 29.96' 293 cfCultec R-300HD x 6 Inside #1Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap6 Chambers in 3 RowsCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf568 cf Total Available Storage Storage Group A created with Chamber WizardDevice Routing Invert Outlet Devices#1 Discarded 29.46'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.05 cfs @ 11.96 hrs HW=29.50' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)SUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 10HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface System - Chamber Wizard Field AChamber Model = Cultec R-300HD (Cultec Recharger® 300HD)Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' OverlapCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing2 Chambers/Row x 7.08' Long +0.80' Cap Length x 2 = 15.77' Row Length +12.0" End Stone x 2 = 17.77' Base Length3 Rows x 51.0" Wide + 6.0" Spacing x 2 + 12.0" Side Stone x 2 = 15.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height6 Chambers x 46.2 cf + 2.7 cf Cap Volume x 2 x 3 Rows = 293.4 cf Chamber Storage979.4 cf Field - 293.4 cf Chambers = 686.0 cf Stone x 40.0% Voids = 274.4 cf Stone StorageChamber Storage + Stone Storage = 567.8 cf = 0.013 afOverall Storage Efficiency = 58.0%Overall System Size = 17.77' x 15.75' x 3.50'6 Chambers36.3 cy Field25.4 cy Stone SUBDIVISIONNOAA10 24-hr C 2-year Rainfall=3.39"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 11HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface SystemInflowDiscardedHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.20.190.180.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010Inflow Area=5,393 sfPeak Elev=30.04'Storage=73 cf 0.18 cfs 0.05 cfs SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 12HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCTime span=0.00-72.00 hrs, dt=0.01 hrs, 7201 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1,990 sf 100.00% Impervious Runoff Depth=4.70"Subcatchment PR1: ROADWAY Tc=6.0 min CN=98 Runoff=0.26 cfs 780 cfRunoff Area=3,403 sf 13.22% Impervious Runoff Depth=0.52"Subcatchment PR2: Lots 3 & 4 Tc=6.0 min CN=47 Runoff=0.03 cfs 146 cfPeak Elev=30.47' Storage=164 cf Inflow=0.29 cfs 926 cfPond 1P: Subsurface System Outflow=0.05 cfs 926 cfTotal Runoff Area = 5,393 sf Runoff Volume = 926 cf Average Runoff Depth = 2.06"54.76% Pervious = 2,953 sf 45.24% Impervious = 2,440 sf SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 13HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR1: ROADWAYRunoff = 0.26 cfs @ 12.13 hrs, Volume= 780 cf, Depth= 4.70" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 10-year Rainfall=4.94"Area (sf) CN Description1,990 98 Paved parking, HSG A1,990 100.00% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR1: ROADWAYRunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.280.260.240.220.20.180.160.140.120.10.080.060.040.020NOAA10 24-hr C10-year Rainfall=4.94"Runoff Area=1,990 sfRunoff Volume=780 cfRunoff Depth=4.70"Tc=6.0 minCN=98 0.26 cfs SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 14HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR2: Lots 3 & 4Runoff = 0.03 cfs @ 12.15 hrs, Volume= 146 cf, Depth= 0.52" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 10-year Rainfall=4.94"Area (sf) CN Description450 98 Paved parking, HSG A2,953 39 >75% Grass cover, Good, HSG A3,403 47 Weighted Average2,953 86.78% Pervious Area450 13.22% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR2: Lots 3 & 4RunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.0340.0320.030.0280.0260.0240.0220.020.0180.0160.0140.0120.010.0080.0060.0040.0020NOAA10 24-hr C10-year Rainfall=4.94"Runoff Area=3,403 sfRunoff Volume=146 cfRunoff Depth=0.52"Tc=6.0 minCN=47 0.03 cfs SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 15HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Pond 1P: Subsurface SystemInflow Area = 5,393 sf, 45.24% Impervious, Inflow Depth = 2.06" for 10-year eventInflow = 0.29 cfs @ 12.13 hrs, Volume= 926 cfOutflow = 0.05 cfs @ 11.87 hrs, Volume= 926 cf, Atten= 82%, Lag= 0.0 minDiscarded = 0.05 cfs @ 11.87 hrs, Volume= 926 cfRouting by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsPeak Elev= 30.47' @ 12.41 hrs Surf.Area= 280 sf Storage= 164 cfPlug-Flow detention time= 13.5 min calculated for 926 cf (100% of inflow)Center-of-Mass det. time= 13.5 min ( 796.7 - 783.2 )Volume Invert Avail.Storage Storage Description#1A 29.46' 274 cf15.75'W x 17.77'L x 3.50'H Field A979 cf Overall - 293 cf Embedded = 686 cf x 40.0% Voids#2A 29.96' 293 cfCultec R-300HD x 6 Inside #1Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap6 Chambers in 3 RowsCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf568 cf Total Available Storage Storage Group A created with Chamber WizardDevice Routing Invert Outlet Devices#1 Discarded 29.46'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.05 cfs @ 11.87 hrs HW=29.50' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 16HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface System - Chamber Wizard Field AChamber Model = Cultec R-300HD (Cultec Recharger® 300HD)Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' OverlapCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing2 Chambers/Row x 7.08' Long +0.80' Cap Length x 2 = 15.77' Row Length +12.0" End Stone x 2 = 17.77' Base Length3 Rows x 51.0" Wide + 6.0" Spacing x 2 + 12.0" Side Stone x 2 = 15.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height6 Chambers x 46.2 cf + 2.7 cf Cap Volume x 2 x 3 Rows = 293.4 cf Chamber Storage979.4 cf Field - 293.4 cf Chambers = 686.0 cf Stone x 40.0% Voids = 274.4 cf Stone StorageChamber Storage + Stone Storage = 567.8 cf = 0.013 afOverall Storage Efficiency = 58.0%Overall System Size = 17.77' x 15.75' x 3.50'6 Chambers36.3 cy Field25.4 cy Stone SUBDIVISIONNOAA10 24-hr C 10-year Rainfall=4.94"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 17HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface SystemInflowDiscardedHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Inflow Area=5,393 sfPeak Elev=30.47'Storage=164 cf 0.29 cfs 0.05 cfs SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 18HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCTime span=0.00-72.00 hrs, dt=0.01 hrs, 7201 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1,990 sf 100.00% Impervious Runoff Depth=5.67"Subcatchment PR1: ROADWAY Tc=6.0 min CN=98 Runoff=0.32 cfs 941 cfRunoff Area=3,403 sf 13.22% Impervious Runoff Depth=0.89"Subcatchment PR2: Lots 3 & 4 Tc=6.0 min CN=47 Runoff=0.08 cfs 254 cfPeak Elev=30.91' Storage=253 cf Inflow=0.39 cfs 1,194 cfPond 1P: Subsurface System Outflow=0.05 cfs 1,194 cfTotal Runoff Area = 5,393 sf Runoff Volume = 1,194 cf Average Runoff Depth = 2.66"54.76% Pervious = 2,953 sf 45.24% Impervious = 2,440 sf SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 19HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR1: ROADWAYRunoff = 0.32 cfs @ 12.13 hrs, Volume= 941 cf, Depth= 5.67" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 25-year Rainfall=5.91"Area (sf) CN Description1,990 98 Paved parking, HSG A1,990 100.00% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR1: ROADWAYRunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020NOAA10 24-hr C25-year Rainfall=5.91"Runoff Area=1,990 sfRunoff Volume=941 cfRunoff Depth=5.67"Tc=6.0 minCN=98 0.32 cfs SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 20HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR2: Lots 3 & 4Runoff = 0.08 cfs @ 12.15 hrs, Volume= 254 cf, Depth= 0.89" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 25-year Rainfall=5.91"Area (sf) CN Description450 98 Paved parking, HSG A2,953 39 >75% Grass cover, Good, HSG A3,403 47 Weighted Average2,953 86.78% Pervious Area450 13.22% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR2: Lots 3 & 4RunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.0850.080.0750.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050NOAA10 24-hr C25-year Rainfall=5.91"Runoff Area=3,403 sfRunoff Volume=254 cfRunoff Depth=0.89"Tc=6.0 minCN=47 0.08 cfs SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 21HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Pond 1P: Subsurface SystemInflow Area = 5,393 sf, 45.24% Impervious, Inflow Depth = 2.66" for 25-year eventInflow = 0.39 cfs @ 12.13 hrs, Volume= 1,194 cfOutflow = 0.05 cfs @ 11.82 hrs, Volume= 1,194 cf, Atten= 86%, Lag= 0.0 minDiscarded = 0.05 cfs @ 11.82 hrs, Volume= 1,194 cfRouting by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsPeak Elev= 30.91' @ 12.52 hrs Surf.Area= 280 sf Storage= 253 cfPlug-Flow detention time= 23.9 min calculated for 1,194 cf (100% of inflow)Center-of-Mass det. time= 23.9 min ( 810.2 - 786.4 )Volume Invert Avail.Storage Storage Description#1A 29.46' 274 cf15.75'W x 17.77'L x 3.50'H Field A979 cf Overall - 293 cf Embedded = 686 cf x 40.0% Voids#2A 29.96' 293 cfCultec R-300HD x 6 Inside #1Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap6 Chambers in 3 RowsCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf568 cf Total Available Storage Storage Group A created with Chamber WizardDevice Routing Invert Outlet Devices#1 Discarded 29.46'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.05 cfs @ 11.82 hrs HW=29.50' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 22HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface System - Chamber Wizard Field AChamber Model = Cultec R-300HD (Cultec Recharger® 300HD)Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' OverlapCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing2 Chambers/Row x 7.08' Long +0.80' Cap Length x 2 = 15.77' Row Length +12.0" End Stone x 2 = 17.77' Base Length3 Rows x 51.0" Wide + 6.0" Spacing x 2 + 12.0" Side Stone x 2 = 15.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height6 Chambers x 46.2 cf + 2.7 cf Cap Volume x 2 x 3 Rows = 293.4 cf Chamber Storage979.4 cf Field - 293.4 cf Chambers = 686.0 cf Stone x 40.0% Voids = 274.4 cf Stone StorageChamber Storage + Stone Storage = 567.8 cf = 0.013 afOverall Storage Efficiency = 58.0%Overall System Size = 17.77' x 15.75' x 3.50'6 Chambers36.3 cy Field25.4 cy Stone SUBDIVISIONNOAA10 24-hr C 25-year Rainfall=5.91"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 23HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface SystemInflowDiscardedHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020Inflow Area=5,393 sfPeak Elev=30.91'Storage=253 cf 0.39 cfs 0.05 cfs SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 24HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCTime span=0.00-72.00 hrs, dt=0.01 hrs, 7201 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1,990 sf 100.00% Impervious Runoff Depth=7.16"Subcatchment PR1: ROADWAY Tc=6.0 min CN=98 Runoff=0.40 cfs 1,187 cfRunoff Area=3,403 sf 13.22% Impervious Runoff Depth=1.61"Subcatchment PR2: Lots 3 & 4 Tc=6.0 min CN=47 Runoff=0.16 cfs 457 cfPeak Elev=31.86' Storage=429 cf Inflow=0.56 cfs 1,645 cfPond 1P: Subsurface System Outflow=0.05 cfs 1,645 cfTotal Runoff Area = 5,393 sf Runoff Volume = 1,645 cf Average Runoff Depth = 3.66"54.76% Pervious = 2,953 sf 45.24% Impervious = 2,440 sf SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 25HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR1: ROADWAYRunoff = 0.40 cfs @ 12.13 hrs, Volume= 1,187 cf, Depth= 7.16" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 100-year Rainfall=7.40"Area (sf) CN Description1,990 98 Paved parking, HSG A1,990 100.00% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR1: ROADWAYRunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.440.420.40.380.360.340.320.30.280.260.240.220.20.180.160.140.120.10.080.060.040.020NOAA10 24-hr C100-year Rainfall=7.40"Runoff Area=1,990 sfRunoff Volume=1,187 cfRunoff Depth=7.16"Tc=6.0 minCN=98 0.40 cfs SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 26HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Subcatchment PR2: Lots 3 & 4Runoff = 0.16 cfs @ 12.14 hrs, Volume= 457 cf, Depth= 1.61" Routed to Pond 1P : Subsurface SystemRunoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsNOAA10 24-hr C 100-year Rainfall=7.40"Area (sf) CN Description450 98 Paved parking, HSG A2,953 39 >75% Grass cover, Good, HSG A3,403 47 Weighted Average2,953 86.78% Pervious Area450 13.22% Impervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment PR2: Lots 3 & 4RunoffHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.180.170.160.150.140.130.120.110.10.090.080.070.060.050.040.030.020.010NOAA10 24-hr C100-year Rainfall=7.40"Runoff Area=3,403 sfRunoff Volume=457 cfRunoff Depth=1.61"Tc=6.0 minCN=47 0.16 cfs SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 27HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCSummary for Pond 1P: Subsurface SystemInflow Area = 5,393 sf, 45.24% Impervious, Inflow Depth = 3.66" for 100-year eventInflow = 0.56 cfs @ 12.13 hrs, Volume= 1,645 cfOutflow = 0.05 cfs @ 11.73 hrs, Volume= 1,645 cf, Atten= 90%, Lag= 0.0 minDiscarded = 0.05 cfs @ 11.73 hrs, Volume= 1,645 cfRouting by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrsPeak Elev= 31.86' @ 12.78 hrs Surf.Area= 280 sf Storage= 429 cfPlug-Flow detention time= 49.1 min calculated for 1,644 cf (100% of inflow)Center-of-Mass det. time= 49.1 min ( 838.2 - 789.1 )Volume Invert Avail.Storage Storage Description#1A 29.46' 274 cf15.75'W x 17.77'L x 3.50'H Field A979 cf Overall - 293 cf Embedded = 686 cf x 40.0% Voids#2A 29.96' 293 cfCultec R-300HD x 6 Inside #1Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap6 Chambers in 3 RowsCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf568 cf Total Available Storage Storage Group A created with Chamber WizardDevice Routing Invert Outlet Devices#1 Discarded 29.46'8.270 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.05 cfs @ 11.73 hrs HW=29.50' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 28HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface System - Chamber Wizard Field AChamber Model = Cultec R-300HD (Cultec Recharger® 300HD)Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cfOverall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' OverlapCap Storage= 2.7 cf x 2 x 3 rows = 15.9 cf51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing2 Chambers/Row x 7.08' Long +0.80' Cap Length x 2 = 15.77' Row Length +12.0" End Stone x 2 = 17.77' Base Length3 Rows x 51.0" Wide + 6.0" Spacing x 2 + 12.0" Side Stone x 2 = 15.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height6 Chambers x 46.2 cf + 2.7 cf Cap Volume x 2 x 3 Rows = 293.4 cf Chamber Storage979.4 cf Field - 293.4 cf Chambers = 686.0 cf Stone x 40.0% Voids = 274.4 cf Stone StorageChamber Storage + Stone Storage = 567.8 cf = 0.013 afOverall Storage Efficiency = 58.0%Overall System Size = 17.77' x 15.75' x 3.50'6 Chambers36.3 cy Field25.4 cy Stone SUBDIVISIONNOAA10 24-hr C 100-year Rainfall=7.40"4857103-SUBDIVISION Printed 8/28/2026Prepared by BSC GroupPage 29HydroCAD® 10.20-9a s/n 00904 © 2026 HydroCAD Software Solutions LLCPond 1P: Subsurface SystemInflowDiscardedHydrographTime (hours)727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.60.550.50.450.40.350.30.250.20.150.10.050Inflow Area=5,393 sfPeak Elev=31.86'Storage=429 cf 0.56 cfs 0.05 cfs