Report 4 13 2026

29906 15 Ridgeway West Orange Final NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 0.57 cfs @ 12.19 hrs, Volume= 0.050 af, Depth= 1.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Area (sf) CN Description 18,843 70 Woods, Good, HSG C 18,843 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.8 100 0.0370 0.25 Sheet Flow, Grass: Short n= 0.150 P2= 4.09" 4.1 244 0.0400 1.00 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 10.9 344 Total Subcatchment 1S: Existing Conditions Study Area Hydrograph 0.6 0.57 cfs Runoff 0.55 NOAA 24-hr D 0.5 2-Year-2050 Rainfall=4.09" 0.45 P2=4.09" 0.4 Runoff Area=18,843 sf Flow (cfs) 0.35

0.4 Runoff Area=18,843 sf Flow (cfs) 0.35 Runoff Volume=0.050 af 0.3 Runoff Depth=1.39" 0.25 Flow Length=344' 0.2 Tc=10.9 min 0.15 CN=70 0.1 0.05 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hours)