29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

rea=3,867 sf 0.6 0.55 Runoff Volume=0.067 af Flow (cfs) 0.5 Runoff Depth=9.06" 0.45 Flow Length=150' 0.4 0.35 Slope=0.0200 '/' 0.3 Tc=0.4 min 0.25 CN=99 0.2 0.15 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 Se NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 1.79 cfs @ 12.35 hrs, Volume= 0.220 af, Depth= 6.12" 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 100-Year-2020 Rainfall=9.18", 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 2 Runoff 1.79 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=18,819 sf Runoff Volume=0.220 af Flow (cfs) 1

noff Area=18,819 sf Runoff Volume=0.220 af Flow (cfs) 1 Runoff Depth=6.12" Flow Length=214' Slope=0.0210 '/' Tc=24.7 min CN=75 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 Se NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.69 cfs @ 12.34 hrs, Volume= 0.083 af, Depth= 5.99" Routed to Reach 12R : Study Point At Inlet 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 100-Year-2020 Rainfall=9.18", P2=3.47" Area (sf) CN Description 7,274 74 >75% Grass cover, Good, HSG C 7,274 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 24.1 231 0.0260 0.16 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" Subcatchment 17S: Bypass Area Direct To Inlet Hydrograph Runoff 0.75 0.69 cfs 0.7 NOAA 24-hr D 0.65 100-Year-2020 Rainfall=9.18" 0.6 0.55 P2=3.47" 0.5 Runoff Area=7,274 sf 0.45 Runoff Volume=0.083 af Flow (cfs) 0.4 Runoff Depth=5.99"

Runoff Volume=0.083 af Flow (cfs) 0.4 Runoff Depth=5.99" 0.35 Flow Length=231' 0.3 Slope=0.0260 '/' 0.25 Tc=24.1 min 0.2 CN=74 0.15 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 Seco NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 1.34 cfs @ 12.22 hrs, Volume= 0.128 af, Depth= 1.39" 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 2-Year-2050 Rainfall=4.09", P2=4.09" 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) 1.4 170 0.0320 2.09 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" 9.5 130 0.0270 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.09" 2.4 167 0.0270 1.15 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 13.3 467 Total Subcatchment 1S: Existing Conditions Study Area Hydrograph Runoff 1.34 cfs NOAA 24-hr D 2-Year-2050 Rainfall=4.09" P2=4.09" 1 Runoff Area=48,267

P2=4.09" 1 Runoff Area=48,267 sf Runoff Volume=0.128 af Flow (cfs) Runoff Depth=1.39" Flow Length=467' Tc=13.3 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 Seco NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 1.08 cfs @ 12.09 hrs, Volume= 0.069 af, Depth= 2.72" 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 2-Year-2050 Rainfall=4.09", P2=4.09" 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 1.08 cfs NOAA 24-hr D 1 2-Year-2050 Rainfall=4.09" P2=4.09" Runoff Area=13,290 sf

P2=4.09" Runoff Area=13,290 sf Runoff Volume=0.069 af Flow (cfs) Runoff Depth=2.72" 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 Seco NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.49 cfs @ 12.09 hrs, Volume= 0.038 af, Depth= 3.97" 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 2-Year-2050 Rainfall=4.09", P2=4.09" 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 0.55 Runoff 0.49 cfs 0.5 NOAA 24-hr D 0.45 2-Year-2050 Rainfall=4.09" 0.4 P2=4.09" 0.35 Runoff Area=5,018 sf Runoff Volume=0.038 af Flow (cfs) 0.3