V4 11 Stormwater Report Rev 3 1 26 2023

Table of Contents Introduction Proposed Improvements. Methodology Existing Conditions.......c..cccecscecssssssseeseeseesessesecesesseeeeenecsussecsecsuseecseesseeeeseseussesansseeeecsneeneeenseeteeeeete 2 Drainage Area 1A (DA-1A).......ccececsessseseceesseeseeseesneseescsssesncsssceeeussueensaseeeseensereeneeanmesseeeeee 2 Drainage Area 1B (DA-1B). Drainage Area 2 (DA-2)...... Drainage Area 3 (DA~-3) ....scecccscsseeseeseesseseessessessesseesessessuesuessssussussussessneseceessesssseseesseresceseneeseesease 3 Drainage Area 4 (DA-4) ....ceeceeeeeceeseesecseseesseeseesssseessessesuesesssssesuesassussesesssssssusenesseesessemeeseeeese 3 Drainage Area 5 (DA-5).. Drainage Area 6 (DA-6) 3 Existing Basin Curve Number .......ccccescescecsesessecseesessecsecsesscssecsuceucescssceecsressceucercsacencencsuceecaresscsusenesacenesuneeeneeesane 4 Peak Flows Post-Development Runoff Target Proposed Conditions Drainage Area 1A (DA-1A)....ccccsceesssssssesesesessesenesescsesessacseseseseseseseseaesseeseeeseeesasasasarsesssneenenenees 5 Drainage Area 1B (DA~-1B)......:.cecssseessseesesesscsseseescsteecsrenesesencarsucaeencseersseacsusaceesaeensatensaeenneereaters 5 Drainage Area 2 (DA-2).. Drainage Area 3 (DA-3).. Drainage Area 4 (DA~4) ...cececeececsesessesesessesscseseceecseersecsrcucsrsecacsucacereneaesessreeserarsnssesesseeeeaneareseeeeenes 6 Green Roof Calculations............cccscescsesssesseecseeccsessseesesssessessseeesecsessessneesseesecssecsnecsneesneesanessaeess 6 Curve Numbers Water Quantity Basin #1A — 1,508 CF. Basin #1B — 3,042 CF Basin #2 — 16,898 CF Basin #3 — 13,250 CF Post-Development Runoff Drain Time ....scecceceesecsesseesesseeseesesseesessesseeseesesscsssesseesssucssssnssssessussessesseescssesscsusenssneeuseessscessecaseaeeas 8 Weather Quality sasiscsctssasiaasneczsie sats ase astet ance onnestasscsnstnce ssi the sna inth isha asp ant Gacas abi casa Func casa oenonan 8 Groundwater Recharge as scssssssavsencavesusrseansencanesecenennercoaevenerceniomereeaisamnuene sounsiser oaeesentuamssnensaan tien 8 / oo ¢.