Revised Stormwater Management Report

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 152 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 = 2.52" for 10-Year event Inflow = 8.21 cfs @ 12.21 hrs, Volume= 35,532 cf Outflow = 2.01 cfs @ 12.80 hrs, Volume= 29,759 cf, Atten= 76%, Lag= 35.4 min Primary = 2.01 cfs @ 12.80 hrs, Volume= 29,759 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= 532.17' @ 12.80 hrs Surf.Area= 16,410 sf Storage= 17,984 cf Plug-Flow detention time= 309.2 min calculated for 29,744 cf (84% of inflow) Center-of-Mass det. time= 237.8 min ( 1,028.1 - 790.2 ) 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=2.01 cfs @ 12.80 hrs HW=532.17' (Free Discharge) 1=Orifice (Orifice Controls 2.01 cfs @ 3.02 fps)