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 232 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 49P: Basin 7 Inflow Area = 169,079 sf, 50.99% Impervious, Inflow Depth = 5.08" for 100-Year event Inflow = 15.55 cfs @ 12.21 hrs, Volume= 71,574 cf Outflow = 4.01 cfs @ 12.76 hrs, Volume= 65,796 cf, Atten= 74%, Lag= 33.1 min Primary = 4.01 cfs @ 12.76 hrs, Volume= 65,796 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= 533.01' @ 12.76 hrs Surf.Area= 17,871 sf Storage= 32,345 cf Plug-Flow detention time= 219.0 min calculated for 65,796 cf (92% of inflow) Center-of-Mass det. time= 176.0 min ( 957.0 - 781.0 ) Volume #1 Invert 531.00' Elevation (feet) 531.00 532.00 533.00 534.00 Device #1 Routing Primary Avail.Storage 50,966 cf Surf.Area (sq-ft) 14,375 16,117 17,860 19,602 Invert 531.38' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 15,246 16,989 18,731 Cum.Store (cubic-feet) 0 15,246 32,235 50,966 Outlet Devices 12.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.01 cfs @ 12.76 hrs HW=533.01' (Free Discharge) 1=Orifice (Orifice Controls 4.01 cfs @ 5.11 fps)