29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

6 P2=4.09" Runoff Area=48,267 sf 5 Runoff Volume=0.702 af Flow (cfs) Runoff Depth=7.61" 4 Flow Length=467' Tc=13.3 min 3 CN=70 2 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 S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 3.56 cfs @ 12.09 hrs, Volume= 0.252 af, Depth= 9.90" 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-2050 Rainfall=11.52", 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 3.56 cfs NOAA 24-hr D 100-Year-2050 Rainfall=11.52" 3 P2=4.09" Runoff Area=13,290 sf

P2=4.09" Runoff Area=13,290 sf Runoff Volume=0.252 af Flow (cfs) 2 Runoff Depth=9.90" Flow Length=220' Slope=0.0340 '/' Tc=0.4 min 1 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 S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment 13S: ROOF WEST Runoff = 1.40 cfs @ 12.08 hrs, Volume= 0.109 af, Depth=11.40" 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-2050 Rainfall=11.52", 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 Runoff 1.40 cfs NOAA 24-hr D 100-Year-2050 Rainfall=11.52" P2=4.09" 1 Runoff Area=5,018 sf Runoff Volume=0.109 af Flow (cfs) Runoff Depth=11.40"

Runoff Volume=0.109 af Flow (cfs) Runoff Depth=11.40" 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 S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 14S: ROOF EAST Runoff = 1.08 cfs @ 12.08 hrs, Volume= 0.084 af, Depth=11.40" 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-2050 Rainfall=11.52", P2=4.09" 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 Runoff 1.08 cfs NOAA 24-hr D 1 100-Year-2050 Rainfall=11.52" P2=4.09" Runoff Area=3,867 sf Runoff Volume=0.084 af Flow (cfs) Runoff Depth=11.40"

Runoff Volume=0.084 af Flow (cfs) Runoff Depth=11.40" 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 S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 2.51 cfs @ 12.33 hrs, Volume= 0.299 af, Depth= 8.30" 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-2050 Rainfall=11.52", P2=4.09" 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) 22.8 214 0.0210 0.16 Sheet Flow, Grass: Dense n= 0.240 P2= 4.09" Subcatchment 16S: Yard Areas to Rear Basin Hydrograph Runoff 2.51 cfs NOAA 24-hr D 100-Year-2050 Rainfall=11.52" 2 P2=4.09" Runoff Area=18,819 sf Runoff Volume=0.299 af Flow (cfs)

Runoff Area=18,819 sf Runoff Volume=0.299 af Flow (cfs) Runoff Depth=8.30" Flow Length=214' Slope=0.0210 '/' 1 Tc=22.8 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 S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.97 cfs @ 12.31 hrs, Volume= 0.114 af, Depth= 8.17" 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-2050 Rainfall=11.52", P2=4.09" 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) 22.2 231 0.0260 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 4.09" Subcatchment 17S: Bypass Area Direct To Inlet Hydrograph Runoff 0.97 cfs 1 NOAA 24-hr D 100-Year-2050 Rainfall=11.52" P2=4.09" Runoff Area=7,274 sf Runoff Volume=0.114 af Flow (cfs) Runoff Depth=8.17" Flow Length=231'