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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment PS-1: Runoff = 0.52 cfs @ 12.04 hrs, Volume= 0.027 af, Depth= 0.77" Routed to Pond BIO-1 : 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 7,027 98 Paved parking, HSG D 11,183 80 >75% Grass cover, Good, HSG D 18,210 87 Weighted Average 11,183 61.41% Pervious Area 7,027 38.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Direct Subcatchment PS-1: Hydrograph Runoff 0.55 0.52 cfs 0.5 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" 0.45 Runoff Area=18,210 sf 0.4 Runoff Volume=0.027 af 0.35 Runoff Depth=0.77" Flow (cfs) 0.3 Tc=6.0 min CN=87 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 477 of 1174