29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

4.09" Runoff Area=13,290 sf Runoff Volume=0.124 af Flow (cfs) 1 Runoff Depth=4.87" 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-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 13S: ROOF WEST Runoff = 0.77 cfs @ 12.09 hrs, Volume= 0.060 af, Depth= 6.25" 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-2050 Rainfall=6.37", 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 0.85 Runoff 0.77 cfs 0.8 0.75 NOAA 24-hr D 0.7 10-Year-2050 Rainfall=6.37" 0.65 0.6 P2=4.09" 0.55 Runoff Area=5,018 sf 0.5 Runoff Volume=0.060 af Flow (cfs) 0.45

Area=5,018 sf 0.5 Runoff Volume=0.060 af Flow (cfs) 0.45 Runoff Depth=6.25" 0.4 0.35 Flow Length=150' 0.3 Slope=0.0200 '/' 0.25 Tc=0.4 min 0.2 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-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.59 cfs @ 12.09 hrs, Volume= 0.046 af, Depth= 6.25" 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-2050 Rainfall=6.37", 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 0.65 Runoff 0.59 cfs 0.6 NOAA 24-hr D 0.55 10-Year-2050 Rainfall=6.37" 0.5 P2=4.09" 0.45 Runoff Area=3,867 sf 0.4 Runoff Volume=0.046 af Flow (cfs) 0.35

Runoff Area=3,867 sf 0.4 Runoff Volume=0.046 af Flow (cfs) 0.35 Runoff Depth=6.25" 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-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 29 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 1.11 cfs @ 12.33 hrs, Volume= 0.130 af, Depth= 3.60" 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-2050 Rainfall=6.37", 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 1.11 cfs NOAA 24-hr D 1 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=18,819 sf Runoff Volume=0.130 af Flow (cfs)

=18,819 sf Runoff Volume=0.130 af Flow (cfs) Runoff Depth=3.60" Flow Length=214' Slope=0.0210 '/' 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 Sec NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 30 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.42 cfs @ 12.31 hrs, Volume= 0.049 af, Depth= 3.50" 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-2050 Rainfall=6.37", 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 0.46 Runoff 0.44 0.42 cfs 0.42 0.4 NOAA 24-hr D 0.38 10-Year-2050 Rainfall=6.37" 0.36 0.34 P2=4.09" 0.32 0.3 Runoff Area=7,274 sf 0.28 Runoff Volume=0.049 af Flow (cfs) 0.26 0.24 0.22

Runoff Volume=0.049 af Flow (cfs) 0.26 0.24 0.22 Runoff Depth=3.50" 0.2 Flow Length=231' 0.18 0.16 Slope=0.0260 '/' 0.14 0.12 Tc=22.2 min 0.1 0.08 CN=74 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 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 31 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 7.53 cfs @ 12.21 hrs, Volume= 0.702 af, Depth= 7.61" 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 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 8 7.53 cfs NOAA 24-hr D 7 100-Year-2050 Rainfall=11.52" 6 P2=4.09"