Report 4 13 2026

29906 15 Ridgeway West Orange Final NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 0.38 cfs @ 12.20 hrs, Volume= 0.036 af, Depth= 0.99" 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-2020 Rainfall=3.47", P2=3.47" 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) 7.4 100 0.0370 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.47" 4.1 244 0.0400 1.00 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.5 344 Total Subcatchment 1S: Existing Conditions Study Area Hydrograph 0.42 0.4 0.38 cfs Runoff 0.38 0.36 NOAA 24-hr D 0.34 0.32 2-Year-2020 Rainfall=3.47" 0.3 0.28 P2=3.47" 0.26 Runoff Area=18,843 sf Flow (cfs) 0.24 0.22

P2=3.47" 0.26 Runoff Area=18,843 sf Flow (cfs) 0.24 0.22 Runoff Volume=0.036 af 0.2 Runoff Depth=0.99" 0.18 0.16 Flow Length=344' 0.14 0.12 Tc=11.5 min 0.1 CN=70 0.08 0.06 0.04 0.02 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)