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E_App E_Post-Development Model NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment PS-8: Runoff = 0.40 cfs @ 12.36 hrs, Volume= 0.047 af, Depth= 0.46" 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 1-yr Rainfall=1.82" 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 0.44 Runoff 0.42 0.40 cfs 0.4 NY-West Seneca 24-hr S1 1-yr 0.38 0.36 Rainfall=1.82" 0.34 Runoff Area=53,474 sf 0.32 0.3 Runoff Volume=0.047 af 0.28 Runoff Depth=0.46" 0.26 Flow (cfs) 0.24 Flow Length=821' 0.22 Slope=0.0100 '/' 0.2 0.18 Tc=25.7 min 0.16 CN=80 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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 210 of 359