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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 43 Summary for Subcatchment PS-6: Runoff = 0.74 cfs @ 12.04 hrs, Volume= 0.046 af, Depth= 3.61" Routed to Pond CH-1 : Chambers 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 25-yr Rainfall=3.84" 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 0.8 0.74 cfs 0.75 NY-West Seneca 24-hr S1 25-yr 0.7 Rainfall=3.84" 0.65 Runoff Area=6,622 sf 0.6 0.55 Runoff Volume=0.046 af 0.5 Runoff Depth=3.61" Flow (cfs) 0.45 Tc=6.0 min 0.4 CN=98 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 510 of 1174