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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 21 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1S: Existing - West Runoff Area=5.700 ac 21.93% Impervious Runoff Depth=2.23" Flow Length=160' Slope=0.0280 '/' Tc=20.6 min CN=84 Runoff=13.91 cfs 1.060 af Subcatchment 2S: Existing - Central Runoff Area=22.800 ac 87.72% Impervious Runoff Depth=3.38" Flow Length=2,297' Tc=12.7 min CN=96 Runoff=98.15 cfs 6.425 af Subcatchment 3S: Existing - East Runoff Area=27.100 ac 97.79% Impervious Runoff Depth=3.61" Flow Length=2,297' Tc=12.7 min CN=98 Runoff=119.64 cfs 8.142 af Link 4L: TOTAL EXISTING Inflow=229.09 cfs 15.627 af Primary=229.09 cfs 15.627 af Total Runoff Area = 55.600 ac Runoff Volume = 15.627 af Average Runoff Depth = 3.37" 14.12% Pervious = 7.850 ac 85.88% Impervious = 47.750 ac Page 718 of 1174