Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 20 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 18P: Basin 5 Inflow Area = 46,603 sf, 92.63% Impervious, Inflow Depth = 3.06" for 2-Year event Inflow = 3.68 cfs @ 12.10 hrs, Volume= 11,878 cf Outflow = 1.37 cfs @ 11.95 hrs, Volume= 11,878 cf, Atten= 63%, Lag= 0.0 min Discarded = 1.37 cfs @ 11.95 hrs, Volume= 11,878 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 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= 579.23' @ 12.16 hrs Surf.Area= 14,810 sf Storage= 1,374 cf Plug-Flow detention time= 6.0 min calculated for 11,877 cf (100% of inflow) Center-of-Mass det. time= 6.0 min ( 762.1 - 756.1 ) Volume #1 Invert 579.00' Elevation (feet) 579.00 580.00 581.00 582.00 583.00 584.00 584.30 Device #1 #2 Avail.Storage 31,397 cf Surf.Area (sq-ft) 14,810 14,810 14,810 14,810 14,810 14,810 14,810 Routing Primary Discarded Invert 579.25' 579.00' Storage Description Custom Stage Data (Prismatic) Listed below 78,493 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 14,810 14,810 14,810 14,810 14,810 4,443 Cum.Store (cubic-feet) 0 14,810 29,620 44,430 59,240 74,050 78,493 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=1.37 cfs @ 11.95 hrs HW=579.06' (Free Discharge) 2=Exfiltration (Exfiltration Controls 1.37 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=579.00' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)