Revised Stormwater Management Report

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 67 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 48P: Basin 8 Inflow Area = 62,190 sf, 63.36% Impervious, Inflow Depth = 2.54" for 2-Year event Inflow = 3.43 cfs @ 12.16 hrs, Volume= 13,161 cf Outflow = 0.95 cfs @ 12.45 hrs, Volume= 13,161 cf, Atten= 72%, Lag= 17.4 min Discarded = 0.93 cfs @ 11.92 hrs, Volume= 13,131 cf Primary = 0.03 cfs @ 12.45 hrs, Volume= 31 cf Routed to Pond 49P : Basin 7 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 573.54' @ 12.45 hrs Surf.Area= 10,019 sf Storage= 2,179 cf Plug-Flow detention time= 11.7 min calculated for 13,155 cf (100% of inflow) Center-of-Mass det. time= 11.7 min ( 791.5 - 779.8 ) Volume #1 Invert 573.00' Elevation (feet) 573.00 574.00 575.00 576.00 Device #1 #2 #3 Avail.Storage 12,023 cf Surf.Area (sq-ft) 10,019 10,019 10,019 10,019 Routing Primary Primary Discarded Invert 575.00' 573.45' 573.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 30,057 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 10,019 10,019 10,019 Cum.Store (cubic-feet) 0 10,019 20,038 30,057 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.93 cfs @ 11.92 hrs HW=573.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.93 cfs) Primary OutFlow Max=0.03 cfs @ 12.45 hrs HW=573.54' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.03 cfs @ 1.04 fps)