Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 56 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 = 4.08" for 10-Year event Inflow = 18.97 cfs @ 12.11 hrs, Volume= 61,340 cf Outflow = 10.90 cfs @ 12.16 hrs, Volume= 61,340 cf, Atten= 43%, Lag= 3.3 min Discarded = 8.27 cfs @ 11.96 hrs, Volume= 59,486 cf Primary = 2.63 cfs @ 12.16 hrs, Volume= 1,854 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= 600.28' @ 12.16 hrs Surf.Area= 35,719 sf Storage= 4,048 cf Plug-Flow detention time= 1.3 min calculated for 61,340 cf (100% of inflow) Center-of-Mass det. time= 1.3 min ( 769.9 - 768.6 ) 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 @ 11.96 hrs HW=600.02' (Free Discharge) 2=Exfiltration (Exfiltration Controls 8.27 cfs) Primary OutFlow Max=2.62 cfs @ 12.16 hrs HW=600.28' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 2.62 cfs @ 1.68 fps)