J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 10 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: PO-DA D Runoff = 0.04 cfs @ 1.17 hrs, Volume= Routed to Reach 3R : TD-01 0.002 af, Depth= 0.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 3,659 2,744 6,403 6,403 CN 80 73 Description >75% Grass cover, Good, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.6 85 0.1773 0.19 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" Subcatchment 6S: PO-DA D Flow (cfs) Hydrograph Runoff 0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 0.04 cfs NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=6,403 sf Runoff Volume=0.002 af Runoff Depth=0.13" Flow Length=85' Slope=0.1773 '/' Tc=7.6 min CN=WQ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24

Post-Developed (O-1A) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 6S: PO-DA D Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.10 0.00 1.00 0.63 0.00 1.50 1.15 0.09 2.00 1.25 0.12 2.50 1.25 0.12 3.00 1.25 0.12 3.50 1.25 0.12 4.00 1.25 0.12 4.50 1.25 0.12 5.00 1.25 0.12 5.50 1.25 0.12 6.00 1.25 0.12 6.50 1.25 0.12 7.00 1.25 0.12 7.50 1.25 0.12 8.00 1.25 0.12 8.50 1.25 0.12 9.00 1.25 0.12 9.50 1.25 0.12 10.00 1.25 0.12 10.50 1.25 0.12 11.00 1.25 0.12 11.50 1.25 0.12 12.00 1.25 0.12 12.50 1.25 0.12 13.00 1.25 0.12 13.50 1.25 0.12 14.00 1.25 0.12 14.50 1.25 0.12 15.00 1.25 0.12 15.50 1.25 0.12 16.00 1.25 0.12 16.50 1.25 0.12 17.00 1.25 0.12 17.50 1.25 0.12 18.00 1.25 0.12 18.50 1.25 0.12 19.00 1.25 0.12 19.50 1.25 0.12 20.00 1.25 0.12 20.50 1.25 0.12 21.00 1.25 0.12 21.50 1.25 0.12 22.00 1.25 0.12 22.50 1.25 0.12 23.00 1.25 0.12 23.50 1.25 0.12 24.00 1.25 0.12 Runoff (cfs) 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 5/13/2024 Page 11

Post-Developed (O-1A) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 12 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: PO-DA F Runoff = 0.02 cfs @ 1.15 hrs, Volume= Routed to Reach 4R : TD-02 0.001 af, Depth= 0.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 1,220 2,526 3,746 3,746 CN 80 73 Description >75% Grass cover, Good, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 66 0.2264 0.19 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" Subcatchment 8S: PO-DA F Flow (cfs) Hydrograph Runoff 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 0.02 cfs NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=3,746 sf Runoff Volume=0.001 af Runoff Depth=0.10" Flow Length=66' Slope=0.2264 '/' Tc=5.6 min CN=WQ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24

Post-Developed (O-1A) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 8S: PO-DA F Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.10 0.00 1.00 0.63 0.00 1.50 1.15 0.06 2.00 1.25 0.09 2.50 1.25 0.09 3.00 1.25 0.09 3.50 1.25 0.09 4.00 1.25 0.09 4.50 1.25 0.09 5.00 1.25 0.09 5.50 1.25 0.09 6.00 1.25 0.09 6.50 1.25 0.09 7.00 1.25 0.09 7.50 1.25 0.09 8.00 1.25 0.09 8.50 1.25 0.09 9.00 1.25 0.09 9.50 1.25 0.09 10.00 1.25 0.09 10.50 1.25 0.09 11.00 1.25 0.09 11.50 1.25 0.09 12.00 1.25 0.09 12.50 1.25 0.09 13.00 1.25 0.09 13.50 1.25 0.09 14.00 1.25 0.09 14.50 1.25 0.09 15.00 1.25 0.09 15.50 1.25 0.09 16.00 1.25 0.09 16.50 1.25 0.09 17.00 1.25 0.09 17.50 1.25 0.09 18.00 1.25 0.09 18.50 1.25 0.09 19.00 1.25 0.09 19.50 1.25 0.09 20.00 1.25 0.09 20.50 1.25 0.09 21.00 1.25 0.09 21.50 1.25 0.09 22.00 1.25 0.09 22.50 1.25 0.09 23.00 1.25 0.09 23.50 1.25 0.09 24.00 1.25 0.09 Runoff (cfs) 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 5/13/2024 Page 13

Post-Developed (O-1A) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 14 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 10S: PO-DA H Runoff = 0.03 cfs @ 1.23 hrs, Volume= Routed to Reach 5R : TD-03 0.001 af, Depth= 0.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 436 9,845 10,281 10,281 CN 80 73 Description >75% Grass cover, Good, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.5 82 0.1736 0.18 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" Subcatchment 10S: PO-DA H Hydrograph 0.032 Runoff 0.03 0.03 cfs NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=10,281 sf Runoff Volume=0.001 af Runoff Depth=0.07" Flow Length=82' Slope=0.1736 '/' Tc=7.5 min CN=WQ 0.028 0.026 0.024 0.022 Flow (cfs) 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24

Post-Developed (O-1A) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 10S: PO-DA H Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.10 0.00 1.00 0.63 0.00 1.50 1.15 0.04 2.00 1.25 0.06 2.50 1.25 0.06 3.00 1.25 0.06 3.50 1.25 0.06 4.00 1.25 0.06 4.50 1.25 0.06 5.00 1.25 0.06 5.50 1.25 0.06 6.00 1.25 0.06 6.50 1.25 0.06 7.00 1.25 0.06 7.50 1.25 0.06 8.00 1.25 0.06 8.50 1.25 0.06 9.00 1.25 0.06 9.50 1.25 0.06 10.00 1.25 0.06 10.50 1.25 0.06 11.00 1.25 0.06 11.50 1.25 0.06 12.00 1.25 0.06 12.50 1.25 0.06 13.00 1.25 0.06 13.50 1.25 0.06 14.00 1.25 0.06 14.50 1.25 0.06 15.00 1.25 0.06 15.50 1.25 0.06 16.00 1.25 0.06 16.50 1.25 0.06 17.00 1.25 0.06 17.50 1.25 0.06 18.00 1.25 0.06 18.50 1.25 0.06 19.00 1.25 0.06 19.50 1.25 0.06 20.00 1.25 0.06 20.50 1.25 0.06 21.00 1.25 0.06 21.50 1.25 0.06 22.00 1.25 0.06 22.50 1.25 0.06 23.00 1.25 0.06 23.50 1.25 0.06 24.00 1.25 0.06 Runoff (cfs) 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 5/13/2024 Page 15

Post-Developed (O-1A) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 16 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: PO-DA K Runoff = 0.08 cfs @ Routed to Pond 7P : O-1A 1.21 hrs, Volume= 0.003 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 1,350 1,133 1,917 4,400 3,050 1,350 CN 98 80 73 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Brush, Good, HSG D Weighted Average 69.32% Pervious Area 30.68% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.1 100 0.0772 0.14 Sheet Flow, Woodland Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" 2.3 139 0.0424 1.03 Shallow Concentrated Flow, Shallow Concentrated Flow Woodland Kv= 5.0 fps 14.4 239 Total Subcatchment 13S: PO-DA K Hydrograph Runoff 0.085 0.08 cfs 0.08 NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=4,400 sf Runoff Volume=0.003 af Runoff Depth=0.39" Flow Length=239' Tc=14.4 min CN=WQ 0.075 0.07 0.065 0.06 Flow (cfs) 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24

Post-Developed (O-1A) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 13S: PO-DA K Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.10 0.00 1.00 0.63 0.01 1.50 1.15 0.17 2.00 1.25 0.22 2.50 1.25 0.22 3.00 1.25 0.22 3.50 1.25 0.22 4.00 1.25 0.22 4.50 1.25 0.22 5.00 1.25 0.22 5.50 1.25 0.22 6.00 1.25 0.22 6.50 1.25 0.22 7.00 1.25 0.22 7.50 1.25 0.22 8.00 1.25 0.22 8.50 1.25 0.22 9.00 1.25 0.22 9.50 1.25 0.22 10.00 1.25 0.22 10.50 1.25 0.22 11.00 1.25 0.22 11.50 1.25 0.22 12.00 1.25 0.22 12.50 1.25 0.22 13.00 1.25 0.22 13.50 1.25 0.22 14.00 1.25 0.22 14.50 1.25 0.22 15.00 1.25 0.22 15.50 1.25 0.22 16.00 1.25 0.22 16.50 1.25 0.22 17.00 1.25 0.22 17.50 1.25 0.22 18.00 1.25 0.22 18.50 1.25 0.22 19.00 1.25 0.22 19.50 1.25 0.22 20.00 1.25 0.22 20.50 1.25 0.22 21.00 1.25 0.22 21.50 1.25 0.22 22.00 1.25 0.22 22.50 1.25 0.22 23.00 1.25 0.22 23.50 1.25 0.22 24.00 1.25 0.22 Runoff (cfs) 0.00 0.00 0.02 0.03 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 5/13/2024 Page 17

Post-Developed (O-1A) NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 18 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: PO-DA L Runoff = 0.03 cfs @ 1.26 hrs, Volume= Routed to Reach 6R : TD-04 0.001 af, Depth= 0.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Area (sf) 915 218 6,839 7,972 7,972 * CN 80 85 73 Description >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 100 0.1003 0.15 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" 0.2 16 0.0339 1.29 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 11.1 116 Total Subcatchment 14S: PO-DA L Hydrograph Runoff 0.028 0.03 cfs 0.026 NJ DEP 2-hr WQ Rainfall=1.25" P2=3.42" Runoff Area=7,972 sf Runoff Volume=0.001 af Runoff Depth=0.08" Flow Length=116' Tc=11.1 min CN=WQ 0.024 0.022 0.02 Flow (cfs) 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24

Post-Developed (O-1A) West Orange HydroCAD_Post NJ DEP 2-hr WQ Rainfall=1.25", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 14S: PO-DA L Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.10 0.00 1.00 0.63 0.00 1.50 1.15 0.05 2.00 1.25 0.07 2.50 1.25 0.07 3.00 1.25 0.07 3.50 1.25 0.07 4.00 1.25 0.07 4.50 1.25 0.07 5.00 1.25 0.07 5.50 1.25 0.07 6.00 1.25 0.07 6.50 1.25 0.07 7.00 1.25 0.07 7.50 1.25 0.07 8.00 1.25 0.07 8.50 1.25 0.07 9.00 1.25 0.07 9.50 1.25 0.07 10.00 1.25 0.07 10.50 1.25 0.07 11.00 1.25 0.07 11.50 1.25 0.07 12.00 1.25 0.07 12.50 1.25 0.07 13.00 1.25 0.07 13.50 1.25 0.07 14.00 1.25 0.07 14.50 1.25 0.07 15.00 1.25 0.07 15.50 1.25 0.07 16.00 1.25 0.07 16.50 1.25 0.07 17.00 1.25 0.07 17.50 1.25 0.07 18.00 1.25 0.07 18.50 1.25 0.07 19.00 1.25 0.07 19.50 1.25 0.07 20.00 1.25 0.07 20.50 1.25 0.07 21.00 1.25 0.07 21.50 1.25 0.07 22.00 1.25 0.07 22.50 1.25 0.07 23.00 1.25 0.07 23.50 1.25 0.07 24.00 1.25 0.07 Runoff (cfs) 0.00 0.00 0.00 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Printed 5/13/2024 Page 19