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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 9 Summary for Subcatchment 1S: Proposed - West [47] Hint: Peak is 430% of capacity of segment #2 Runoff = 40.40 cfs @ 12.03 hrs, Volume= 1.915 af, Depth= 1.20" 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 (ac) CN Description 5.060 80 >75% Grass cover, Good, HSG D 4.110 98 Roofs, HSG D 10.040 98 Paved parking, HSG D 19.210 93 Weighted Average 5.060 26.34% Pervious Area 14.150 73.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 100 0.0100 0.92 Sheet Flow, pavement Smooth surfaces n= 0.011 P2= 2.50" 3.0 950 0.0080 5.32 9.40 Pipe Channel, 18" PIPE 18.0" Round Area= 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 Corrugated PE, smooth interior 4.8 1,050 Total Subcatchment 1S: Proposed - West Hydrograph 44 Runoff 40.40 cfs 42 40 NY-WestSeneca_NOAA14 24-hr S1 1-yr 38 Rainfall=1.87" 36 Runoff Area=19.210 ac 34 Runoff Volume=1.915 af 32 30 Runoff Depth=1.20" 28 Flow Length=1,050' 26 Tc=4.8 min Flow (cfs) 24 CN=93 22 20 18 16 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Time (hours) Page 744 of 1174