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24-4113 WEST SENECA EXCHANGE EXISTING Type II 24-hr 25-Year Rainfall=3.84" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 26 Subcatchment 3S: Existing - East Hydrograph 130 Runoff 119.64 cfs 120 Type II 24-hr 110 25-Year Rainfall=3.84" 100 90 Runoff Area=27.100 ac 80 Runoff Volume=8.142 af Flow (cfs) 70 Runoff Depth=3.61" 60 Flow Length=2,297' 50 Tc=12.7 min 40 CN=98 30 20 10 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 723 of 1174