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24-4113 WEST SENECA EXCHANGE EXISTING Type II 24-hr 1-Year Rainfall=1.87" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 1S: Existing - West Runoff = 3.92 cfs @ 12.15 hrs, Volume= 0.310 af, Depth= 0.65" Routed to Link 4L : TOTAL EXISTING Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 1-Year Rainfall=1.87" Area (ac) CN Description 1.250 98 Water Surface, HSG D 4.450 80 >75% Grass cover, Good, HSG D 5.700 84 Weighted Average 4.450 78.07% Pervious Area 1.250 21.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.6 160 0.0280 0.13 Sheet Flow, grass Grass: Dense n= 0.240 P2= 2.50" Subcatchment 1S: Existing - West Hydrograph Runoff 3.92 cfs 4 Type II 24-hr 1-Year Rainfall=1.87" 3 Runoff Area=5.700 ac Runoff Volume=0.310 af Flow (cfs) Runoff Depth=0.65" 2 Flow Length=160' Slope=0.0280 '/' Tc=20.6 min 1 CN=84 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 Time (hours) Page 705 of 1174