29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.50 cfs @ 12.09 hrs, Volume= 0.039 af, Depth= 5.26" 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-2020 Rainfall=5.38", 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 0.55 Runoff 0.50 cfs 0.5 NOAA 24-hr D 0.45 10-Year-2020 Rainfall=5.38" 0.4 P2=3.47" 0.35 Runoff Area=3,867 sf Runoff Volume=0.039 af Flow (cfs) 0.3

Runoff Volume=0.039 af Flow (cfs) 0.3 Runoff Depth=5.26" 0.25 Flow Length=150' 0.2 Slope=0.0200 '/' 0.15 Tc=0.4 min 0.1 CN=99 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)