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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 10 Summary for Subcatchment 6S: DA Uncontrolled [47] Hint: Peak is 120% of capacity of segment #3 Runoff = 26.40 cfs @ 12.04 hrs, Volume= 1.369 af, Depth= 1.45" Routed to Pond 16P : OUTLET PIPE 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 7.720 98 Paved parking, HSG D 1.500 80 >75% Grass cover, Good, HSG D 2.120 98 Roofs, HSG D 11.340 96 Weighted Average 1.500 13.23% Pervious Area 9.840 86.77% 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" 1.1 170 0.0150 2.49 Shallow Concentrated Flow, PVMT Paved Kv= 20.3 fps 3.1 580 0.0040 3.10 21.94 Pipe Channel, 36" Pipe 36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75' n= 0.025 Corrugated metal 6.0 850 Total Page 745 of 1174