29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

Runoff Volume=0.038 af Flow (cfs) 0.3 Runoff Depth=3.97" 0.25 Flow Length=150' 0.2 Slope=0.0200 '/' 0.15 Tc=0.4 min 0.1 CN=99 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 22 Summary for Subcatchment 14S: ROOF EAST Runoff = 0.38 cfs @ 12.09 hrs, Volume= 0.029 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 * 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 0.42 Runoff 0.4 0.38 cfs 0.38 NOAA 24-hr D 0.36 0.34 2-Year-2050 Rainfall=4.09" 0.32 0.3 P2=4.09" 0.28 Runoff Area=3,867 sf 0.26 0.24 Runoff Volume=0.029 af Flow (cfs) 0.22

Runoff Area=3,867 sf 0.26 0.24 Runoff Volume=0.029 af Flow (cfs) 0.22 0.2 Runoff Depth=3.97" 0.18 Flow Length=150' 0.16 0.14 Slope=0.0200 '/' 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-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 23 Summary for Subcatchment 16S: Yard Areas to Rear Basin Runoff = 0.53 cfs @ 12.34 hrs, Volume= 0.062 af, Depth= 1.73" 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 * 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 0.53 cfs 0.55 NOAA 24-hr D 0.5 2-Year-2050 Rainfall=4.09" 0.45 P2=4.09" 0.4 Runoff Area=18,819 sf 0.35

P2=4.09" 0.4 Runoff Area=18,819 sf 0.35 Runoff Volume=0.062 af Flow (cfs) 0.3 Runoff Depth=1.73" 0.25 Flow Length=214' 0.2 Slope=0.0210 '/' 0.15 Tc=22.8 min 0.1 CN=75 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 24 Summary for Subcatchment 17S: Bypass Area Direct To Inlet Runoff = 0.20 cfs @ 12.33 hrs, Volume= 0.023 af, Depth= 1.66" 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-2050 Rainfall=4.09", 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 0.21 0.20 cfs 0.2 0.19 NOAA 24-hr D 0.18 0.17 2-Year-2050 Rainfall=4.09" 0.16 P2=4.09" 0.15 0.14 Runoff Area=7,274 sf 0.13 Runoff Volume=0.023 af Flow (cfs) 0.12 0.11 Runoff Depth=1.66"

Runoff Volume=0.023 af Flow (cfs) 0.12 0.11 Runoff Depth=1.66" 0.1 0.09 Flow Length=231' 0.08 0.07 Slope=0.0260 '/' 0.06 Tc=22.2 min 0.05 0.04 CN=74 0.03 0.02 0.01 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 25 Summary for Subcatchment 1S: Existing Conditions Study Area Runoff = 3.11 cfs @ 12.22 hrs, Volume= 0.286 af, Depth= 3.10" 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 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 3.11 cfs 3 NOAA 24-hr D 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=48,267 sf

P2=4.09" Runoff Area=48,267 sf 2 Runoff Volume=0.286 af Flow (cfs) Runoff Depth=3.10" Flow Length=467' Tc=13.3 min 1 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 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 26 Summary for Subcatchment 12S: PERMEABLE PAVEMENT TO THE INFILTRATION Runoff = 1.85 cfs @ 12.09 hrs, Volume= 0.124 af, Depth= 4.87" 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 10-Year-2050 Rainfall=6.37", 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 2 1.85 cfs NOAA 24-hr D 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=13,290 sf Runoff