Report 4 13 2026

29906 15 Ridgeway West Orange Fina NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 2.26 cfs @ 12.19 hrs, Volume= 0.198 af, Depth= 5.49" 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 100-Year-2020 Rainfall=9.18", 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 2.26 cfs Runoff NOAA 24-hr D 2 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=18,843 sf Runoff Volume=0.198 af Flow (cfs)

sf Runoff Volume=0.198 af Flow (cfs) Runoff Depth=5.49" 1 Flow Length=344' Tc=11.5 min CN=70 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)