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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 11 Summary for Subcatchment PS-6: Runoff = 0.37 cfs @ 12.04 hrs, Volume= 0.020 af, Depth= 1.60" Routed to Reach DP-1 : Design Point 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 6,622 98 Paved parking, HSG D 6,622 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Subcatchment PS-6: Hydrograph Runoff 0.4 0.37 cfs 0.38 0.36 NY-West Seneca 24-hr S1 1-yr 0.34 Rainfall=1.82" 0.32 Runoff Area=6,622 sf 0.3 0.28 Runoff Volume=0.020 af 0.26 Runoff Depth=1.60" 0.24 Flow (cfs) 0.22 Tc=6.0 min 0.2 CN=98 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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 207 of 849