Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 77 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 16P: Basin 1 Inflow Area = 378,971 sf, 51.29% Impervious, Inflow Depth = 3.19" for 100-Year event Inflow = 33.46 cfs @ 12.18 hrs, Volume= 100,659 cf Outflow = 1.18 cfs @ 14.57 hrs, Volume= 89,978 cf, Atten= 96%, Lag= 143.3 min Primary = 1.18 cfs @ 14.57 hrs, Volume= 89,978 cf Routed to Link 25L : POA 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 545.56' @ 14.57 hrs Surf.Area= 36,933 sf Storage= 71,431 cf Plug-Flow detention time= 788.4 min calculated for 89,978 cf (89% of inflow) Center-of-Mass det. time= 736.4 min ( 1,523.2 - 786.8 ) Volume #1 Invert 543.50' Elevation (feet) 543.50 544.00 545.00 546.00 547.00 Avail.Storage 126,759 cf Surf.Area (sq-ft) 32,670 33,541 35,719 37,897 39,640 Device #1 Routing Primary Invert 546.00' #2 Primary 543.75' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 16,553 34,630 36,808 38,769 Cum.Store (cubic-feet) 0 16,553 51,183 87,991 126,759 Outlet Devices 42.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.18 cfs @ 14.57 hrs HW=545.56' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 1.18 cfs @ 6.01 fps)