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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 11 Summary for Subcatchment 3S: Existing - East [47] Hint: Peak is 269% of capacity of segment #4 [47] Hint: Peak is 280% of capacity of segment #5 Runoff = 56.79 cfs @ 12.04 hrs, Volume= 3.716 af, Depth= 1.65" 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 26.500 98 Paved parking, HSG D 0.600 80 >75% Grass cover, Good, HSG D 27.100 98 Weighted Average 0.600 2.21% Pervious Area 26.500 97.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.6 300 0.0160 1.39 Sheet Flow, pavement Smooth surfaces n= 0.011 P2= 2.50" 1.1 175 0.0160 2.57 Shallow Concentrated Flow, pavement Paved Kv= 20.3 fps 0.8 510 0.0110 11.00 132.00 Channel Flow, ditch/swale Area= 12.0 sf Perim= 10.0' r= 1.20' n= 0.016 Asphalt, rough 4.2 745 0.0037 2.98 21.10 Pipe Channel, 36" Pipe 36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75' n= 0.025 Corrugated metal 2.1 267 0.0015 2.11 20.26 Pipe Channel, 42" Pipe 42.0" Round Area= 9.6 sf Perim= 11.0' r= 0.88' n= 0.025 Corrugated metal 0.9 300 0.0070 5.38 85.55 Pipe Channel, 54" Pipe 54.0" Round Area= 15.9 sf Perim= 14.1' r= 1.13' n= 0.025 Corrugated metal 12.7 2,297 Total Page 708 of 1174