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24-4113 WEST SENECA EXCAHNGE NY-WestSeneca_NOAA14 24-hr S1 1-yr 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 16 Summary for Subcatchment 15S: PDA-3 Runoff = 0.36 cfs @ 12.03 hrs, Volume= 0.018 af, Depth= 0.81" Routed to Pond 18P : POND Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-150.00 hrs, dt= 0.01 hrs NY-WestSeneca_NOAA14 24-hr S1 1-yr Rainfall=1.87" Area (sf) CN Description 7,225 80 >75% Grass cover, Good, HSG D 4,150 98 Paved parking, HSG D 11,375 87 Weighted Average 7,225 63.52% Pervious Area 4,150 36.48% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 15S: PDA-3 Hydrograph 0.4 Runoff 0.38 0.36 cfs 0.36 NY-WestSeneca_NOAA14 24-hr S1 1-yr 0.34 Rainfall=1.87" 0.32 Runoff Area=11,375 sf 0.3 Runoff Volume=0.018 af 0.28 Runoff Depth=0.81" 0.26 Tc=5.0 min 0.24 CN=87 Flow (cfs) 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Time (hours) Page 751 of 1174