29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

P2=3.47" Runoff Area=48,267 sf Runoff Volume=0.091 af Flow (cfs) Runoff Depth=0.99" 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 Seco NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 0.87 cfs @ 12.09 hrs, Volume= 0.055 af, Depth= 2.16" 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-2020 Rainfall=3.47", 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 0.95 Runoff 0.87 cfs 0.9 0.85 NOAA 24-hr D 0.8 0.75 2-Year-2020 Rainfall=3.47" 0.7 P2=3.47" 0.65 0.6

nfall=3.47" 0.7 P2=3.47" 0.65 0.6 Runoff Area=13,290 sf 0.55 Runoff Volume=0.055 af Flow (cfs) 0.5 Runoff Depth=2.16" 0.45 0.4 Flow Length=220' 0.35 Slope=0.0340 '/' 0.3 0.25 Tc=0.4 min 0.2 CN=87 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-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.42 cfs @ 12.09 hrs, Volume= 0.032 af, Depth= 3.35" 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-2020 Rainfall=3.47", 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 0.46 Runoff 0.44 0.42 cfs 0.42 0.4 NOAA 24-hr D 0.38 2-Year-2020 Rainfall=3.47" 0.36 0.34 P2=3.47" 0.32 0.3 Runoff Area=5,018 sf 0.28 Runoff Volume=0.032 af Flow

Runoff Area=5,018 sf 0.28 Runoff Volume=0.032 af Flow (cfs) 0.26 0.24 0.22 Runoff Depth=3.35" 0.2 Flow Length=150' 0.18 0.16 Slope=0.0200 '/' 0.14 0.12 Tc=0.4 min 0.1 0.08 CN=99 0.06 0.04 0.02 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-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.32 cfs @ 12.09 hrs, Volume= 0.025 af, Depth= 3.35" 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-2020 Rainfall=3.47", 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 0.36 Runoff 0.34 0.32 cfs 0.32 NOAA 24-hr D 0.3 0.28 2-Year-2020 Rainfall=3.47" 0.26 P2=3.47" 0.24 Runoff Area=3,867 sf 0.22 Runoff Volume=0.025 af Flow (cfs) 0.2

Runoff Area=3,867 sf 0.22 Runoff Volume=0.025 af Flow (cfs) 0.2 0.18 Runoff Depth=3.35" 0.16 Flow Length=150' 0.14 0.12 Slope=0.0200 '/' 0.1 Tc=0.4 min 0.08 0.06 CN=99 0.04 0.02 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-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 0.37 cfs @ 12.37 hrs, Volume= 0.046 af, Depth= 1.28" 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-2020 Rainfall=3.47", 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 0.4 Runoff 0.37 cfs 0.38 0.36 NOAA 24-hr D 0.34 0.32 2-Year-2020 Rainfall=3.47" 0.3 P2=3.47" 0.28 0.26 Runoff Area=18,819 sf 0.24

P2=3.47" 0.28 0.26 Runoff Area=18,819 sf 0.24 Runoff Volume=0.046 af Flow (cfs) 0.22 0.2 Runoff Depth=1.28" 0.18 0.16 Flow Length=214' 0.14 Slope=0.0210 '/' 0.12 0.1 Tc=24.7 min 0.08 CN=75 0.06 0.04 0.02 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-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.14 cfs @ 12.35 hrs, Volume= 0.017 af, Depth= 1.22" 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 2-Year-2020 Rainfall=3.47", 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 0.15 Runoff 0.14 cfs 0.14 0.13 NOAA 24-hr D 0.12 2-Year-2020 Rainfall=3.47" 0.11 P2=3.47" 0.1 Runoff Area=7,274 sf 0.09 Runoff Volume=0.017 af Flow (cfs) 0.08 Runoff Depth=1.22" 0.07 0.06