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E_App E_Post-Development Model NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment PS-4: Runoff = 1.28 cfs @ 12.04 hrs, Volume= 0.065 af, Depth= 1.15" Routed to Pond BIO-3 : Filtration Bioretention Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Area (sf) CN Description 20,928 98 Paved parking, HSG D 8,557 80 >75% Grass cover, Good, HSG D 29,485 93 Weighted Average 8,557 29.02% Pervious Area 20,928 70.98% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Subcatchment PS-4: Hydrograph Runoff 1.28 cfs NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Runoff Area=29,485 sf 1 Runoff Volume=0.065 af Runoff Depth=1.15" Flow (cfs) Tc=6.0 min CN=93 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Page 209 of 1493