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24-4113 WEST SENECA EXCAHNGENY-WestSeneca_NOAA14 24-hr S1 25-yr Rainfall=4.10" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 37 Summary for Subcatchment 1S: Proposed - West [47] Hint: Peak is 1145% of capacity of segment #2 Runoff = 107.55 cfs @ 12.02 hrs, Volume= 5.310 af, Depth= 3.32" 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 25-yr Rainfall=4.10" 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 120 Runoff 115 107.55 cfs 110 105 NY-WestSeneca_NOAA14 24-hr S1 25-yr 100 Rainfall=4.10" 95 Runoff Area=19.210 ac 90 Runoff Volume=5.310 af 85 80 Runoff Depth=3.32" 75 Flow Length=1,050' 70 Tc=4.8 min Flow (cfs) 65 CN=93 60 55 50 45 40 35 30 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Time (hours) Page 772 of 1174