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WNY-2500056.00_HydroCAD extreme_precip_tables_output (29) 24-hr S1 1-yr Rainfall=1.88" Prepared by Greenman-Pedersen, Inc Printed 12/18/2025 HydroCAD® 10.20-7a s/n 04560 © 2025 HydroCAD Software Solutions LLC Page 30 Summary for Pond EX RCVR: EX RCVR Inflow Area = 0.500 ac, 78.00% Impervious, Inflow Depth > 1.08" for 1-yr event Inflow = 0.45 cfs @ 12.02 hrs, Volume= 0.045 af Outflow = 0.45 cfs @ 12.02 hrs, Volume= 0.045 af, Atten= 0%, Lag= 0.0 min Primary = 0.45 cfs @ 12.02 hrs, Volume= 0.045 af Routed to Link POST : Post Development Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 900.03' @ 12.02 hrs Device Routing Invert Outlet Devices #1 Primary 899.60' 12.0" Round 12" HDPE L= 121.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 899.60' / 899.23' S= 0.0031 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=0.43 cfs @ 12.02 hrs HW=900.02' TW=0.00' (Dynamic Tailwater) 1=12" HDPE (Barrel Controls 0.43 cfs @ 2.02 fps) Pond EX RCVR: EX RCVR 12" HDPE