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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 55 Summary for Pond BIO-2: Filtration Bioretention Inflow Area = 0.649 ac, 33.49% Impervious, Inflow Depth = 2.40" for 25-yr event Inflow = 2.35 cfs @ 12.04 hrs, Volume= 0.130 af Outflow = 1.01 cfs @ 12.20 hrs, Volume= 0.126 af, Atten= 57%, Lag= 9.7 min Primary = 0.03 cfs @ 12.20 hrs, Volume= 0.072 af Routed to Reach DP-1 : Design Point Secondary = 0.99 cfs @ 12.20 hrs, Volume= 0.055 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= 597.11' @ 12.20 hrs Surf.Area= 2,439 sf Storage= 2,288 cf Flood Elev= 598.00' Surf.Area= 3,117 sf Storage= 4,754 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 552.4 min ( 1,364.9 - 812.4 ) Volume Invert Avail.Storage Storage Description #1 592.42' 4,754 cf Above Mulch Surface (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 592.42 370 0.0 0 0 592.43 370 20.0 1 1 593.25 370 20.0 61 61 595.75 370 40.0 370 431 596.00 370 100.0 93 524 596.50 1,629 100.0 500 1,024 597.00 2,353 100.0 996 2,019 598.00 3,117 100.0 2,735 4,754 Device Routing Invert Outlet Devices #1 Primary 592.42' 0.500 in/hr Exfiltration Through Media over Surface area #2 Device 3 597.00' 24.0" x 24.0" Horiz. Overflow Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 592.58' 12.0" Round Culvert L= 132.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 592.58' / 591.92' S= 0.0050 '/' Cc= 0.900 n= 0.012 Corrugated PE, smooth interior, Flow Area= 0.79 sf #4 Tertiary 597.50' 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 522 of 1174