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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 40 Summary for Subcatchment PS-3: Runoff = 2.35 cfs @ 12.04 hrs, Volume= 0.130 af, Depth= 2.40" 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 25-yr Rainfall=3.84" 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 Runoff 2.35 cfs NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" 2 Runoff Area=28,267 sf Runoff Volume=0.130 af Runoff Depth=2.40" Flow (cfs) Tc=6.0 min CN=86 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 507 of 1174