Revised Stormwater Management Report

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 212 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 33P: Basin 11 Inflow Area = 84,693 sf, 77.02% Impervious, Inflow Depth = 7.78" for 100-Year event Inflow = 13.28 cfs @ 12.17 hrs, Volume= 54,918 cf Outflow = 10.88 cfs @ 12.24 hrs, Volume= 54,918 cf, Atten= 18%, Lag= 4.1 min Discarded = 3.13 cfs @ 11.84 hrs, Volume= 45,948 cf Primary = 7.75 cfs @ 12.24 hrs, Volume= 8,970 cf Routed to Link 28L : POA 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 590.72' @ 12.24 hrs Surf.Area= 13,504 sf Storage= 3,879 cf Plug-Flow detention time= 2.5 min calculated for 54,890 cf (100% of inflow) Center-of-Mass det. time= 2.5 min ( 760.0 - 757.5 ) Volume #1 Invert 590.00' Elevation (feet) 590.00 591.00 592.00 592.42 Device #1 #2 Avail.Storage 13,072 cf Surf.Area (sq-ft) 13,504 13,504 13,504 13,504 Routing Primary Discarded Invert 590.10' 590.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 32,680 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 13,504 13,504 5,672 Cum.Store (cubic-feet) 0 13,504 27,008 32,680 Outlet Devices 5.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=3.13 cfs @ 11.84 hrs HW=590.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 3.13 cfs) Primary OutFlow Max=7.70 cfs @ 12.24 hrs HW=590.72' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 7.70 cfs @ 2.57 fps)