29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

ume=0.017 af Flow (cfs) 0.08 Runoff Depth=1.22" 0.07 0.06 Flow Length=231' 0.05 Slope=0.0260 '/' 0.04 Tc=24.1 min 0.03 CN=74 0.02 0.01 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)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 2.24 cfs @ 12.23 hrs, Volume= 0.214 af, Depth= 2.32" 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN Description 48,267 70 Woods, Good, HSG C 48,267 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.5 170 0.0320 1.92 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 10.3 130 0.0270 0.21 Sheet Flow, Grass: Short n= 0.150 P2= 3.47" 2.4 167 0.0270 1.15 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 14.2 467 Total Subcatchment 1S: Existing Conditions Study Area Hydrograph Runoff 2.24 cfs NOAA 24-hr D 2 10-Year-2020 Rainfall=5.38" P2=3.47" Runoff Area=48,267 sf

P2=3.47" Runoff Area=48,267 sf Runoff Volume=0.214 af Flow (cfs) Runoff Depth=2.32" 1 Flow Length=467' Tc=14.2 min CN=70 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)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 1.51 cfs @ 12.09 hrs, Volume= 0.100 af, Depth= 3.93" Routed to Pond 12P : Front 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN Description * 6,776 99 Permeable Pavement 6,514 74 >75% Grass cover, Good, HSG C 13,290 87 Weighted Average 6,514 49.01% Pervious Area 6,776 50.99% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 220 0.0340 9.63 5.25 Pipe Channel, 10.0" Round Area= 0.5 sf Perim= 2.6' r= 0.21' n= 0.010 PVC, smooth interior Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Hydrograph Runoff 1.51 cfs NOAA 24-hr D 10-Year-2020 Rainfall=5.38" P2=3.47" Runoff Area=13,290 sf 1

Runoff Area=13,290 sf 1 Runoff Volume=0.100 af Flow (cfs) Runoff Depth=3.93" Flow Length=220' Slope=0.0340 '/' Tc=0.4 min CN=87 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)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.65 cfs @ 12.09 hrs, Volume= 0.051 af, Depth= 5.26" 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN Description * 5,018 99 5,018 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 150 0.0200 6.36 2.22 Pipe Channel, Roof Drains 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.010 PVC, smooth interior Subcatchment 13S: ROOF WEST Hydrograph Runoff 0.7 0.65 cfs 0.65 NOAA 24-hr D 0.6 10-Year-2020 Rainfall=5.38" 0.55 P2=3.47" 0.5 Runoff Area=5,018 sf 0.45 Runoff Volume=0.051 af Flow (cfs)

Runoff Area=5,018 sf 0.45 Runoff Volume=0.051 af Flow (cfs) 0.4 0.35 Runoff Depth=5.26" 0.3 Flow Length=150' 0.25 Slope=0.0200 '/' 0.2 Tc=0.4 min 0.15 CN=99 0.1 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)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.50 cfs @ 12.09 hrs, Volume= 0.039 af, Depth= 5.26" 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 10-Year-2020 Rainfall=5.38", P2=3.47" Area (sf) CN Description * 3,867 99 3,867 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.4 150 0.0200 6.36 2.22 Pipe Channel, 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.010 PVC, smooth interior Subcatchment 14S: ROOF EAST Hydrograph 0.55 Runoff 0.50 cfs 0.5 NOAA 24-hr D 0.45 10-Year-2020 Rainfall=5.38" 0.4 P2=3.47" 0.35 Runoff Area=3,867 sf Runoff Volume=0.039 af Flow (cfs) 0.3

Runoff Volume=0.039 af Flow (cfs) 0.3 Runoff Depth=5.26" 0.25 Flow Length=150' 0.2 Slope=0.0200 '/' 0.15 Tc=0.4 min 0.1 CN=99 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)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 0.81 cfs @ 12.36 hrs, Volume= 0.099 af, Depth= 2.76" 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 10-Year-2020 Rainfall=5.38", P2=3.47" 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) 24.7 214 0.0210 0.14 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" Subcatchment 16S: Yard Areas to Rear Basin Hydrograph 0.9 Runoff 0.85 0.81 cfs 0.8 NOAA 24-hr D 0.75 10-Year-2020 Rainfall=5.38" 0.7 0.65 P2=3.47" 0.6 Runoff Area=18,819 sf 0.55