Report 4 13 2026

pth=3.24" Tc=5.0 min CN=98 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)

29906 15 Ridgeway West Orange Final NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment 12S: Proposed Condition To Infiltration System Runoff = 2.03 cfs @ 12.12 hrs, Volume= 0.163 af, Depth= 5.14" Routed to Pond 12P : Infiltration basin 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN Description * 16,609 98 Impervious to Permeable Pavement 16,609 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 12S: Proposed Condition To Infiltration System Hydrograph 2.03 cfs Runoff 2 NOAA 24-hr D 10-Year-2020 Rainfall=5.38" P2=3.47" Runoff Area=16,609 sf Flow (cfs) Runoff Volume=0.163 af 1 Runoff Depth=5.14" Tc=5.0 min

Tc=5.0 min CN=98 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)

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 33 Summary for Subcatchment 12S: Proposed Condition To Infiltration System Runoff = 3.47 cfs @ 12.12 hrs, Volume= 0.284 af, Depth= 8.94" Routed to Pond 12P : Infiltration basin 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 * 16,609 98 Impervious to Permeable Pavement 16,609 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 12S: Proposed Condition To Infiltration System Hydrograph 3.47 cfs Runoff NOAA 24-hr D 3 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=16,609 sf Runoff Volume=0.284 af Flow (cfs) 2 Runoff Depth=8.94" Tc=5.0 min

4" Tc=5.0 min CN=98 1 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)

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 34 Summary for Subcatchment 12S: Proposed Condition To Infiltration System Runoff = 1.54 cfs @ 12.12 hrs, Volume= 0.122 af, Depth= 3.85" Routed to Pond 12P : Infiltration basin 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 * 16,609 98 Impervious to Permeable Pavement 16,609 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 12S: Proposed Condition To Infiltration System Hydrograph 1.54 cfs Runoff NOAA 24-hr D 2-Year-2050 Rainfall=4.09" P2=4.09" 1 Runoff Area=16,609 sf Flow (cfs) Runoff Volume=0.122 af Runoff Depth=3.85" Tc=5.0 min

pth=3.85" Tc=5.0 min CN=98 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)

29906 15 Ridgeway West Orange Final NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 12S: Proposed Condition To Infiltration System Runoff = 2.41 cfs @ 12.12 hrs, Volume= 0.195 af, Depth= 6.13" Routed to Pond 12P : Infiltration basin 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 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description * 16,609 98 Impervious to Permeable Pavement 16,609 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 12S: Proposed Condition To Infiltration System Hydrograph 2.41 cfs Runoff NOAA 24-hr D 2 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=16,609 sf Flow (cfs) Runoff Volume=0.195 af Runoff Depth=6.13" 1 Tc=5.0 min CN=98

Tc=5.0 min CN=98 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)

29906 15 Ridgeway West Orange Fin NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 4/20/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment 12S: Proposed Condition To Infiltration System Runoff = 4.36 cfs @ 12.12 hrs, Volume= 0.358 af, Depth=11.28" Routed to Pond 12P : Infiltration basin 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-2050 Rainfall=11.52", P2=4.09" Area (sf) CN Description * 16,609 98 Impervious to Permeable Pavement 16,609 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 12S: Proposed Condition To Infiltration System Hydrograph 4.36 cfs Runoff 4 NOAA 24-hr D 100-Year-2050 Rainfall=11.52" P2=4.09" 3 Runoff Area=16,609 sf Runoff Volume=0.358 af Flow (cfs) Runoff Depth=11.28" 2 Tc=5.0 min