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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 60 Summary for Pond SWALE: SWALE Inflow Area = 0.280 ac, 64.29% Impervious, Inflow Depth > 1.15" for 1-yr event Inflow = 0.34 cfs @ 12.02 hrs, Volume= 0.027 af Outflow = 0.09 cfs @ 12.60 hrs, Volume= 0.016 af, Atten= 74%, Lag= 35.0 min Primary = 0.09 cfs @ 12.60 hrs, Volume= 0.016 af Routed to Pond RCVR 1 : RCVR 1 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 900.91' @ 12.57 hrs Surf.Area= 978 sf Storage= 624 cf Plug-Flow detention time= 226.6 min calculated for 0.016 af (60% of inflow) Center-of-Mass det. time= 117.4 min ( 924.2 - 806.9 ) Volume Invert Avail.Storage Storage Description #1 900.00' 2,104 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 900.00 396 0 0 901.00 1,038 717 717 902.00 1,736 1,387 2,104 Device Routing Invert Outlet Devices #1 Primary 900.68' 8.0" Round 8" HDPE L= 32.0' CPP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 900.68' / 900.55' S= 0.0041 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf Primary OutFlow Max=0.09 cfs @ 12.60 hrs HW=900.91' TW=900.79' (Dynamic Tailwater) 1=8" HDPE (Outlet Controls 0.09 cfs @ 1.23 fps)