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HomeMy WebLinkAboutKate Roosa_RE_ Town of Barnstable DPW - 725 Main Street - Stormwater QuestionFrom: Kate Roosa <klr@envpartners.com> Sent: Tuesday, January 10, 2023 11:56 AM To: Karle, Darcy Cc: Francesca Barilla; Ziad F. Kary; Cavanaugh, Kimberly; Beaudoin, Griffin Subject: RE: Town of Barnstable DPW - 725 Main Street - Stormwater Queson Aachments: 725MainSt_PostDevelopment_Atlas14.pdf Good morning Darcy, To answer the Chair ’s queson: Yes, we can and we did re-run the HydroCAD model using the provided NOAA Atlas 14 precipitaon events. Aached is a PDF of the revised HydroCAD Report. The table below summarizes that post- development peak flows do not exceed pre-development condions. Table 3A – Post-Development Peak Flows using NOAA Atlas 14 Storm Events Design Points NOAA Atlas 14 2-Year (3.39") NOAA Atlas 14 10-Year (4.95") NOAA Atlas 14 25-Year (5.92") NOAA Atlas 14 100-Year (7.41") 4L 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs 9L*0.00 cfs (0.08 cfs)0.00 cfs (0.14 cfs)0.00 cfs (0.18 cfs)0.00 cfs (0.24 cfs) *Reach 9L estimates about 0.50 cfs of infiltration capacity. Therefore, the number shown is the difference between the estimated capacity and the runoff from the design storm. The design storm runoff value in parenthesis represents the inflow to the infiltration strips. Please pass this along and let me know if there are any other quesons I can help answer. Thanks, Kate Kathryn L. Roosa, PE Senior Project Engineer She/Her O: 617.657.0986 Environmental Partners envpartners.com From: Karle, Darcy <Darcy.Karle@town.barnstable.ma.us> Sent: Tuesday, January 10, 2023 9:59 AM To: Kate Roosa <klr@envpartners.com> Cc: Francesca Barilla <b@envpartners.com>; Ziad F. Kary <z@envpartners.com> Subject: RE: [EXT] FW: Town of Barnstable DPW - 725 Main Street CAUTION Hi Kate, Only if you have me. From: Kate Roosa [mailto:klr@envpartners.com] Sent: Tuesday, January 10, 2023 9:57 AM To: Karle, Darcy Cc: Francesca Barilla; Ziad F. Kary Subject: RE: [EXT] FW: Town of Barnstable DPW - 725 Main Street Hi Darcy, Yes, I will review the queson below and the aachment. Would you like a response in advance of the meeng? Thanks, Kate Kathryn L. Roosa, PE Senior Project Engineer She/Her O: 617.657.0986 Environmental Partners envpartners.com From: Karle, Darcy <Darcy.Karle@town.barnstable.ma.us> Sent: Tuesday, January 10, 2023 9:55 AM To: Kate Roosa <klr@envpartners.com> Subject: [EXT] FW: Town of Barnstable DPW - 725 Main Street CAUTION Hi Kate, Could you please review the queson below from our Chair who reviewed the storm water report? Thank you Darcy From: Tom Lee [mailto:tlee@horsleywitten.com] Sent: Tuesday, January 10, 2023 9:52 AM To: Karle, Darcy Subject: Town of Barnstable DPW - 725 Main Street Hi, Darcy: The stormwater report seems to be ok. However, can you ask the Town making another run of the HydroCAD model using the NOAA+ precipitaon data to confirm the result and drainage sizing? F.P. (Tom) Lee, P.E. | Associate Principal, Principal Engineer Horsley Witten Group, Inc. 90 Route 6A, Unit #1 | Sandwich, MA 02563 Office: 508-833-6600 CAUTION:This email originated from outside of the Town of Barnstable! Do not click links, open aachments or reply, unless you recognize the sender's email address and know the content is safe! This email originated from outside of the organizaon. Do not click links or open aachments unless you recognize the sender and know the content is safe. CAUTION:This email originated from outside of the Town of Barnstable! Do not click links, open aachments or reply, unless you recognize the sender's email address and know the content is safe! This email originated from outside of the organizaon. Do not click links or open aachments unless you recognize the sender and know the content is safe. CAUTION:This email originated from outside of the Town of Barnstable! Do not click links, open aachments or reply, unless you recognize the sender's email address and know the content is safe!