29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Se NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.86 cfs @ 12.08 hrs, Volume= 0.067 af, Depth= 9.06" 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 100-Year-2020 Rainfall=9.18", P2=3.47" Area (sf) CN Description * 3,867 99 3,867 100.00% 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, 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.010 PVC, smooth interior Subcatchment 14S: ROOF EAST Hydrograph 0.95 Runoff 0.9 0.86 cfs 0.85 NOAA 24-hr D 0.8 0.75 100-Year-2020 Rainfall=9.18" 0.7 P2=3.47" 0.65 Runoff Area=3,867 sf 0.6 0.55 Runoff Volume=0.067 af Flow (cfs)

rea=3,867 sf 0.6 0.55 Runoff Volume=0.067 af Flow (cfs) 0.5 Runoff Depth=9.06" 0.45 Flow Length=150' 0.4 0.35 Slope=0.0200 '/' 0.3 Tc=0.4 min 0.25 CN=99 0.2 0.15 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)