Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 87 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 24P: Basin 6 Inflow Area = 180,292 sf, 63.14% Impervious, Inflow Depth = 7.35" for 100-Year event Inflow = 33.86 cfs @ 12.11 hrs, Volume= 110,442 cf Outflow = 19.94 cfs @ 12.16 hrs, Volume= 110,442 cf, Atten= 41%, Lag= 3.2 min Discarded = 8.27 cfs @ 11.83 hrs, Volume= 97,656 cf Primary = 11.67 cfs @ 12.16 hrs, Volume= 12,785 cf Routed to Pond 16P : Basin 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 600.74' @ 12.16 hrs Surf.Area= 35,719 sf Storage= 10,554 cf Plug-Flow detention time= 2.5 min calculated for 110,426 cf (100% of inflow) Center-of-Mass det. time= 2.5 min ( 763.5 - 761.0 ) Volume #1 Invert 600.00' Elevation (feet) 600.00 601.00 601.42 Device #1 #2 Avail.Storage 20,288 cf Surf.Area (sq-ft) 35,719 35,719 35,719 Routing Primary Discarded Invert 600.02' 600.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 50,721 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 35,719 15,002 Cum.Store (cubic-feet) 0 35,719 50,721 Outlet Devices 6.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=8.27 cfs @ 11.83 hrs HW=600.01' (Free Discharge) 2=Exfiltration (Exfiltration Controls 8.27 cfs) Primary OutFlow Max=11.66 cfs @ 12.16 hrs HW=600.74' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 11.66 cfs @ 2.77 fps)