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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 51 Summary for Pond BIO-1: Filtration Bioretention Inflow Area = 0.418 ac, 38.59% Impervious, Inflow Depth = 2.49" for 25-yr event Inflow = 1.57 cfs @ 12.04 hrs, Volume= 0.087 af Outflow = 0.71 cfs @ 12.19 hrs, Volume= 0.083 af, Atten= 55%, Lag= 8.9 min Primary = 0.02 cfs @ 12.19 hrs, Volume= 0.048 af Routed to Reach DP-1 : Design Point Secondary = 0.69 cfs @ 12.19 hrs, Volume= 0.036 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= 599.09' @ 12.19 hrs Surf.Area= 1,541 sf Storage= 1,543 cf Flood Elev= 600.00' Surf.Area= 2,203 sf Storage= 3,248 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 614.7 min ( 1,423.8 - 809.1 ) Volume Invert Avail.Storage Storage Description #1 594.42' 3,248 cf Bioretention (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 594.42 350 0.0 0 0 594.43 350 20.0 1 1 595.25 350 20.0 57 58 597.75 350 40.0 350 408 598.00 350 100.0 88 496 599.00 1,476 100.0 913 1,409 600.00 2,203 100.0 1,840 3,248 Device Routing Invert Outlet Devices #1 Primary 594.42' 0.500 in/hr Exfiltration Through Media over Surface area #2 Device 3 599.00' 24.0" x 24.0" Horiz. Overflow Grate C= 0.600 Limited to weir flow at low heads #3 Secondary 594.58' 12.0" Round Culvert L= 25.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 594.58' / 594.33' S= 0.0100 '/' Cc= 0.900 n= 0.012 Corrugated PE, smooth interior, Flow Area= 0.79 sf #4 Tertiary 599.50' 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 518 of 1174