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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 8 Summary for Subcatchment PS-3: Runoff = 0.74 cfs @ 12.04 hrs, Volume= 0.039 af, Depth= 0.72" Routed to Pond BIO-2 : 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 9,466 98 Paved parking, HSG D 18,801 80 >75% Grass cover, Good, HSG D 28,267 86 Weighted Average 18,801 66.51% Pervious Area 9,466 33.49% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Subcatchment PS-3: Hydrograph 0.8 Runoff 0.74 cfs 0.75 NY-West Seneca 24-hr S1 1-yr 0.7 Rainfall=1.82" 0.65 0.6 Runoff Area=28,267 sf 0.55 Runoff Volume=0.039 af 0.5 Runoff Depth=0.72" Flow (cfs) 0.45 Tc=6.0 min 0.4 CN=86 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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 205 of 359