29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Seco NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.42 cfs @ 12.09 hrs, Volume= 0.032 af, Depth= 3.35" 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 2-Year-2020 Rainfall=3.47", P2=3.47" 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 0.46 Runoff 0.44 0.42 cfs 0.42 0.4 NOAA 24-hr D 0.38 2-Year-2020 Rainfall=3.47" 0.36 0.34 P2=3.47" 0.32 0.3 Runoff Area=5,018 sf 0.28 Runoff Volume=0.032 af Flow

Runoff Area=5,018 sf 0.28 Runoff Volume=0.032 af Flow (cfs) 0.26 0.24 0.22 Runoff Depth=3.35" 0.2 Flow Length=150' 0.18 0.16 Slope=0.0200 '/' 0.14 0.12 Tc=0.4 min 0.1 0.08 CN=99 0.06 0.04 0.02 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)