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 17 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 1.79 cfs @ 12.35 hrs, Volume= 0.220 af, Depth= 6.12" 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 * 756 99 Sidewalks Patio Ac units 18,063 74 >75% Grass cover, Good, HSG C 18,819 75 Weighted Average 18,063 95.98% Pervious Area 756 4.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 24.7 214 0.0210 0.14 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" Subcatchment 16S: Yard Areas to Rear Basin Hydrograph 2 Runoff 1.79 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=18,819 sf Runoff Volume=0.220 af Flow (cfs) 1

noff Area=18,819 sf Runoff Volume=0.220 af Flow (cfs) 1 Runoff Depth=6.12" Flow Length=214' Slope=0.0210 '/' Tc=24.7 min CN=75 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)