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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 30 Summary for Pond BIO-3: Filtration Bioretention Inflow Area = 0.743 ac, 64.64% Impervious, Inflow Depth = 1.08" for 1-yr event Inflow = 1.32 cfs @ 12.04 hrs, Volume= 0.067 af Outflow = 0.03 cfs @ 15.20 hrs, Volume= 0.067 af, Atten= 98%, Lag= 189.6 min Primary = 0.03 cfs @ 15.20 hrs, Volume= 0.067 af Routed to Reach DP-1 : Design Point Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach DP-1 : Design Point Tertiary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach DP-1 : Design Point Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 595.48' @ 15.20 hrs Surf.Area= 2,839 sf Storage= 1,854 cf Flood Elev= 597.00' Surf.Area= 4,176 sf Storage= 7,294 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 984.1 min ( 1,804.3 - 820.1 ) Volume Invert Avail.Storage Storage Description #1 591.42' 12,099 cf Above Mulch Surface (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 591.42 705 0.0 0 0 591.43 705 20.0 1 1 592.25 705 20.0 116 117 594.75 705 40.0 705 822 595.00 705 100.0 176 998 595.50 2,913 100.0 905 1,903 596.00 3,433 100.0 1,587 3,489 597.00 4,176 100.0 3,805 7,294 598.00 5,434 100.0 4,805 12,099 Device Routing Invert Outlet Devices #1 Primary 591.42' 0.500 in/hr Exfiltration Through Media over Surface area #2 Device 3 596.00' 24.0" x 24.0" Horiz. Overflow Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 591.58' 12.0" Round Culvert L= 28.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 591.58' / 591.30' S= 0.0100 '/' Cc= 0.900 n= 0.012 Corrugated PE, smooth interior, Flow Area= 0.79 sf #4 Tertiary 596.50' 10.0' long x 3.0' breadth Emergency Overflow Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 Page 497 of 1174