29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.77 cfs @ 12.09 hrs, Volume= 0.060 af, Depth= 6.25" Routed to Pond 15P : Rear Yard Basin Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description * 5,018 99 5,018 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 150 0.0200 6.36 2.22 Pipe Channel, Roof Drains 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.010 PVC, smooth interior Subcatchment 13S: ROOF WEST Hydrograph 0.85 Runoff 0.77 cfs 0.8 0.75 NOAA 24-hr D 0.7 10-Year-2050 Rainfall=6.37" 0.65 0.6 P2=4.09" 0.55 Runoff Area=5,018 sf 0.5 Runoff Volume=0.060 af Flow (cfs) 0.45

Area=5,018 sf 0.5 Runoff Volume=0.060 af Flow (cfs) 0.45 Runoff Depth=6.25" 0.4 0.35 Flow Length=150' 0.3 Slope=0.0200 '/' 0.25 Tc=0.4 min 0.2 0.15 CN=99 0.1 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)