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E_App E_Post-Development Model NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment PS-8: Runoff = 1.32 cfs @ 12.32 hrs, Volume= 0.139 af, Depth= 1.36" 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 10-yr Rainfall=3.14" Area (sf) CN Description 53,474 80 >75% Grass cover, Good, HSG D 53,474 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0100 0.11 Sheet Flow, SF Grass: Short n= 0.150 P2= 2.20" 8.8 371 0.0100 0.70 Shallow Concentrated Flow, SCF Short Grass Pasture Kv= 7.0 fps 1.3 350 0.0100 4.54 3.56 Pipe Channel, Pipe Flow 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 25.7 821 Total Subcatchment PS-8: Hydrograph Runoff 1.32 cfs NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Runoff Area=53,474 sf 1 Runoff Volume=0.139 af Runoff Depth=1.36" Flow (cfs) Flow Length=821' Slope=0.0100 '/' Tc=25.7 min CN=80 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 232 of 1493