29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Seco NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 0.53 cfs @ 12.34 hrs, Volume= 0.062 af, Depth= 1.73" 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-2050 Rainfall=4.09", P2=4.09" 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) 22.8 214 0.0210 0.16 Sheet Flow, Grass: Dense n= 0.240 P2= 4.09" Subcatchment 16S: Yard Areas to Rear Basin Hydrograph Runoff 0.53 cfs 0.55 NOAA 24-hr D 0.5 2-Year-2050 Rainfall=4.09" 0.45 P2=4.09" 0.4 Runoff Area=18,819 sf 0.35

P2=4.09" 0.4 Runoff Area=18,819 sf 0.35 Runoff Volume=0.062 af Flow (cfs) 0.3 Runoff Depth=1.73" 0.25 Flow Length=214' 0.2 Slope=0.0210 '/' 0.15 Tc=22.8 min 0.1 CN=75 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)