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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 39 Summary for Subcatchment PS-2: Runoff = 8.11 cfs @ 12.04 hrs, Volume= 0.480 af, Depth= 3.38" 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 64,548 98 Paved parking, HSG D 9,657 80 >75% Grass cover, Good, HSG D 74,205 96 Weighted Average 9,657 13.01% Pervious Area 64,548 86.99% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Subcatchment PS-2: Hydrograph 9 Runoff 8.11 cfs 8 NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" 7 Runoff Area=74,205 sf 6 Runoff Volume=0.480 af Runoff Depth=3.38" Flow (cfs) 5 Tc=6.0 min CN=96 4 3 2 1 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 506 of 1174