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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 7 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=0.65" Flow Length=160' Slope=0.0280 '/' Tc=20.6 min CN=84 Runoff=3.92 cfs 0.310 af Subcatchment 2S: Existing - Central Runoff Area=22.800 ac 87.72% Impervious Runoff Depth=1.45" Flow Length=2,297' Tc=12.7 min CN=96 Runoff=44.18 cfs 2.753 af Subcatchment 3S: Existing - East Runoff Area=27.100 ac 97.79% Impervious Runoff Depth=1.65" Flow Length=2,297' Tc=12.7 min CN=98 Runoff=56.79 cfs 3.716 af Link 4L: TOTAL EXISTING Inflow=103.89 cfs 6.779 af Primary=103.89 cfs 6.779 af Total Runoff Area = 55.600 ac Runoff Volume = 6.779 af Average Runoff Depth = 1.46" 14.12% Pervious = 7.850 ac 85.88% Impervious = 47.750 ac Page 704 of 1174