29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

P2=3.47" 0.6 Runoff Area=18,819 sf 0.55 Runoff Volume=0.099 af Flow (cfs) 0.5 0.45 Runoff Depth=2.76" 0.4 Flow Length=214' 0.35 0.3 Slope=0.0210 '/' 0.25 Tc=24.7 min 0.2 0.15 CN=75 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 12 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.31 cfs @ 12.35 hrs, Volume= 0.037 af, Depth= 2.67" 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 10-Year-2020 Rainfall=5.38", 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 0.34 Runoff 0.31 cfs 0.32 0.3 NOAA 24-hr D 0.28 10-Year-2020 Rainfall=5.38" 0.26 P2=3.47" 0.24 0.22 Runoff Area=7,274 sf 0.2 Runoff Volume=0.037 af Flow (cfs) 0.18 Runoff Depth=2.67" 0.16 0.14

.037 af Flow (cfs) 0.18 Runoff Depth=2.67" 0.16 0.14 Flow Length=231' 0.12 Slope=0.0260 '/' 0.1 Tc=24.1 min 0.08 0.06 CN=74 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 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 13 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 5.34 cfs @ 12.22 hrs, Volume= 0.507 af, Depth= 5.49" 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 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 5.34 cfs NOAA 24-hr D 5 100-Year-2020 Rainfall=9.18" P2=3.47" 4

=9.18" P2=3.47" 4 Runoff Area=48,267 sf Runoff Volume=0.507 af Flow (cfs) 3 Runoff Depth=5.49" Flow Length=467' Tc=14.2 min 2 CN=70 1 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 14 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 2.79 cfs @ 12.09 hrs, Volume= 0.193 af, Depth= 7.60" 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 100-Year-2020 Rainfall=9.18", 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 3 2.79 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" 2 Runoff Area=13,290 sf

.47" 2 Runoff Area=13,290 sf Runoff Volume=0.193 af Flow (cfs) Runoff Depth=7.60" Flow Length=220' Slope=0.0340 '/' 1 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 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 15 Summary for Subcatchment 13S: ROOF WEST Runoff = 1.11 cfs @ 12.08 hrs, Volume= 0.087 af, Depth= 9.06" 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 * 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 1.11 cfs NOAA 24-hr D 1 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=5,018 sf Runoff Volume=0.087 af Flow (cfs) Runoff Depth=9.06"

unoff Volume=0.087 af Flow (cfs) Runoff Depth=9.06" Flow Length=150' Slope=0.0200 '/' Tc=0.4 min CN=99 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 16 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.86 cfs @ 12.08 hrs, Volume= 0.067 af, Depth= 9.06" 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 * 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 0.95 Runoff 0.9 0.86 cfs 0.85 NOAA 24-hr D 0.8 0.75 100-Year-2020 Rainfall=9.18" 0.7 P2=3.47" 0.65 Runoff Area=3,867 sf 0.6 0.55 Runoff Volume=0.067 af Flow (cfs)