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 51 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 = 4.80" for 10-Year event Inflow = 5.69 cfs @ 12.10 hrs, Volume= 18,652 cf Outflow = 2.43 cfs @ 12.14 hrs, Volume= 18,652 cf, Atten= 57%, Lag= 2.7 min Discarded = 1.37 cfs @ 11.84 hrs, Volume= 17,615 cf Primary = 1.06 cfs @ 12.14 hrs, Volume= 1,037 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= 579.44' @ 12.14 hrs Surf.Area= 14,810 sf Storage= 2,595 cf Plug-Flow detention time= 8.1 min calculated for 18,649 cf (100% of inflow) Center-of-Mass det. time= 8.1 min ( 756.5 - 748.4 ) 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 @ 11.84 hrs HW=579.06' (Free Discharge) 2=Exfiltration (Exfiltration Controls 1.37 cfs) Primary OutFlow Max=1.05 cfs @ 12.14 hrs HW=579.44' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 1.05 cfs @ 1.42 fps)