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 5 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 0.37 cfs @ 12.37 hrs, Volume= 0.046 af, Depth= 1.28" 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 * 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 0.4 Runoff 0.37 cfs 0.38 0.36 NOAA 24-hr D 0.34 0.32 2-Year-2020 Rainfall=3.47" 0.3 P2=3.47" 0.28 0.26 Runoff Area=18,819 sf 0.24

P2=3.47" 0.28 0.26 Runoff Area=18,819 sf 0.24 Runoff Volume=0.046 af Flow (cfs) 0.22 0.2 Runoff Depth=1.28" 0.18 0.16 Flow Length=214' 0.14 Slope=0.0210 '/' 0.12 0.1 Tc=24.7 min 0.08 CN=75 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)