J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 11S: PO-DA I Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.04 0.00 1.00 0.07 0.00 1.50 0.11 0.00 2.00 0.15 0.00 2.50 0.20 0.00 3.00 0.24 0.00 3.50 0.29 0.00 4.00 0.34 0.00 4.50 0.39 0.01 5.00 0.44 0.02 5.50 0.49 0.03 6.00 0.55 0.05 6.50 0.61 0.07 7.00 0.68 0.09 7.50 0.75 0.13 8.00 0.84 0.16 8.50 0.93 0.21 9.00 1.02 0.27 9.50 1.14 0.33 10.00 1.28 0.43 10.50 1.44 0.54 11.00 1.67 0.71 11.50 2.04 1.00 12.00 3.09 1.89 12.50 4.40 3.10 13.00 4.77 3.45 13.50 5.00 3.67 14.00 5.16 3.82 14.50 5.30 3.96 15.00 5.42 4.07 15.50 5.51 4.16 16.00 5.60 4.25 16.50 5.69 4.32 17.00 5.76 4.40 17.50 5.83 4.46 18.00 5.89 4.52 18.50 5.95 4.57 19.00 6.00 4.63 19.50 6.05 4.68 20.00 6.10 4.72 20.50 6.15 4.77 21.00 6.20 4.82 21.50 6.24 4.86 22.00 6.29 4.90 22.50 6.33 4.94 23.00 6.37 4.98 23.50 6.40 5.02 24.00 6.44 5.05 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.05 0.06 0.09 0.16 0.68 0.27 0.14 0.09 0.07 0.06 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Printed 5/13/2024 Page 24

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 25 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: PO-DA J Runoff = 1.79 cfs @ 12.12 hrs, Volume= Routed to Pond 6P : BR-04 0.136 af, Depth> 5.14" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Area (sf) 5,314 3,703 4,792 13,809 8,495 5,314 * CN 98 80 85 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 61.52% Pervious Area 38.48% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.4 96 0.0336 0.30 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.42" Subcatchment 12S: PO-DA J Hydrograph Runoff Flow (cfs) 1.79 cfs NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=13,809 sf Runoff Volume=0.136 af Runoff Depth>5.14" Flow Length=96' Slope=0.0336 '/' Tc=5.4 min CN=WQ 1 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 12S: PO-DA J Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.04 0.00 1.00 0.07 0.00 1.50 0.11 0.00 2.00 0.15 0.00 2.50 0.20 0.00 3.00 0.24 0.00 3.50 0.29 0.00 4.00 0.34 0.01 4.50 0.39 0.01 5.00 0.44 0.03 5.50 0.49 0.04 6.00 0.55 0.06 6.50 0.61 0.08 7.00 0.68 0.11 7.50 0.75 0.15 8.00 0.84 0.19 8.50 0.93 0.24 9.00 1.02 0.30 9.50 1.14 0.37 10.00 1.28 0.47 10.50 1.44 0.59 11.00 1.67 0.76 11.50 2.04 1.06 12.00 3.09 1.98 12.50 4.40 3.20 13.00 4.77 3.55 13.50 5.00 3.77 14.00 5.16 3.93 14.50 5.30 4.06 15.00 5.42 4.17 15.50 5.51 4.27 16.00 5.60 4.35 16.50 5.69 4.43 17.00 5.76 4.50 17.50 5.83 4.57 18.00 5.89 4.63 18.50 5.95 4.68 19.00 6.00 4.74 19.50 6.05 4.79 20.00 6.10 4.83 20.50 6.15 4.88 21.00 6.20 4.93 21.50 6.24 4.97 22.00 6.29 5.01 22.50 6.33 5.05 23.00 6.37 5.09 23.50 6.40 5.13 24.00 6.44 5.16 Runoff (cfs) 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.06 0.08 0.13 0.22 0.98 0.35 0.19 0.12 0.09 0.08 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 Printed 5/13/2024 Page 26

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 27 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: PO-DA K Runoff = 0.37 cfs @ 12.22 hrs, Volume= Routed to Pond 7P : O-1A 0.038 af, Depth> 4.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 25-Year Rainfall=6.44", 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 0.4 0.38 0.36 0.37 cfs NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=4,400 sf Runoff Volume=0.038 af Runoff Depth>4.47" Flow Length=239' Tc=14.4 min CN=WQ Flow (cfs) 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", 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 0.04 0.00 1.00 0.07 0.00 1.50 0.11 0.00 2.00 0.15 0.00 2.50 0.20 0.00 3.00 0.24 0.00 3.50 0.29 0.00 4.00 0.34 0.00 4.50 0.39 0.00 5.00 0.44 0.00 5.50 0.49 0.00 6.00 0.55 0.01 6.50 0.61 0.01 7.00 0.68 0.02 7.50 0.75 0.04 8.00 0.84 0.06 8.50 0.93 0.09 9.00 1.02 0.12 9.50 1.14 0.17 10.00 1.28 0.23 10.50 1.44 0.31 11.00 1.67 0.44 11.50 2.04 0.68 12.00 3.09 1.45 12.50 4.40 2.55 13.00 4.77 2.87 13.50 5.00 3.08 14.00 5.16 3.23 14.50 5.30 3.35 15.00 5.42 3.46 15.50 5.51 3.54 16.00 5.60 3.62 16.50 5.69 3.70 17.00 5.76 3.77 17.50 5.83 3.83 18.00 5.89 3.89 18.50 5.95 3.94 19.00 6.00 3.99 19.50 6.05 4.03 20.00 6.10 4.08 20.50 6.15 4.13 21.00 6.20 4.17 21.50 6.24 4.21 22.00 6.29 4.25 22.50 6.33 4.29 23.00 6.37 4.33 23.50 6.40 4.36 24.00 6.44 4.39 Runoff (cfs) 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 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.03 0.05 0.15 0.15 0.06 0.04 0.03 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Printed 5/13/2024 Page 28

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 29 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: PO-DA L Runoff = 0.63 cfs @ 12.19 hrs, Volume= Routed to Reach 6R : TD-04 0.054 af, Depth> 3.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 25-Year Rainfall=6.44", 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 0.7 Runoff 0.63 cfs 0.65 NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=7,972 sf Runoff Volume=0.054 af Runoff Depth>3.56" Flow Length=116' Tc=11.1 min CN=WQ 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", 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 0.04 0.00 1.00 0.07 0.00 1.50 0.11 0.00 2.00 0.15 0.00 2.50 0.20 0.00 3.00 0.24 0.00 3.50 0.29 0.00 4.00 0.34 0.00 4.50 0.39 0.00 5.00 0.44 0.00 5.50 0.49 0.00 6.00 0.55 0.00 6.50 0.61 0.00 7.00 0.68 0.00 7.50 0.75 0.00 8.00 0.84 0.00 8.50 0.93 0.01 9.00 1.02 0.03 9.50 1.14 0.05 10.00 1.28 0.08 10.50 1.44 0.13 11.00 1.67 0.21 11.50 2.04 0.37 12.00 3.09 0.96 12.50 4.40 1.89 13.00 4.77 2.18 13.50 5.00 2.36 14.00 5.16 2.50 14.50 5.30 2.61 15.00 5.42 2.70 15.50 5.51 2.78 16.00 5.60 2.86 16.50 5.69 2.92 17.00 5.76 2.99 17.50 5.83 3.04 18.00 5.89 3.09 18.50 5.95 3.14 19.00 6.00 3.18 19.50 6.05 3.23 20.00 6.10 3.27 20.50 6.15 3.31 21.00 6.20 3.35 21.50 6.24 3.39 22.00 6.29 3.43 22.50 6.33 3.46 23.00 6.37 3.50 23.50 6.40 3.53 24.00 6.44 3.56 Runoff (cfs) 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 0.01 0.01 0.01 0.02 0.03 0.07 0.26 0.20 0.10 0.06 0.05 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Printed 5/13/2024 Page 30

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 31 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Reach 3R: TD-01 Inflow Area = 0.147 ac, 0.00% Impervious, Inflow Depth > 3.86" for 25-Year event Inflow = 0.62 cfs @ 12.15 hrs, Volume= 0.047 af Outflow = 0.62 cfs @ 12.15 hrs, Volume= 0.047 af, Atten= 0%, Lag= 0.2 min Routed to Pond 12P : SD-03, SD-04, SD-05 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Max. Velocity= 4.21 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.43 fps, Avg. Travel Time= 0.8 min Peak Storage= 10 cf @ 12.15 hrs Average Depth at Peak Storage= 0.10' , Surface Width= 1.50' Bank-Full Depth= 1.50' Flow Area= 2.3 sf, Capacity= 30.28 cfs 1.50' x 1.50' deep channel, n= 0.012 Concrete pipe, finished Length= 67.2' Slope= 0.0298 '/' Inlet Invert= 606.00', Outlet Invert= 604.00' Reach 3R: TD-01 Hydrograph Inflow Outflow 0.62 cfs Inflow Area=0.147 ac Avg. Flow Depth=0.10' Max Vel=4.21 fps n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs 0.65 0.62 cfs 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Reach 3R: TD-01 Time (hours) 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00 10.50 11.00 11.50 12.00 12.50 13.00 13.50 14.00 14.50 15.00 15.50 16.00 16.50 17.00 17.50 18.00 18.50 19.00 19.50 20.00 20.50 21.00 21.50 22.00 22.50 23.00 23.50 24.00 Inflow (cfs) 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 0.01 0.01 0.01 0.02 0.03 0.06 0.29 0.15 0.08 0.05 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 2 2 6 4 3 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 Elevation (feet) 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.01 606.01 606.01 606.02 606.02 606.06 606.04 606.03 606.02 606.02 606.02 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.00 Outflow (cfs) 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 0.01 0.01 0.01 0.02 0.03 0.06 0.29 0.15 0.08 0.05 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Printed 5/13/2024 Page 32

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 33 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Reach 4R: TD-02 Inflow Area = 0.086 ac, 0.00% Impervious, Inflow Depth > 3.69" for 25-Year event Inflow = 0.38 cfs @ 12.13 hrs, Volume= 0.026 af Outflow = 0.38 cfs @ 12.13 hrs, Volume= 0.026 af, Atten= 0%, Lag= 0.1 min Routed to Pond 15P : SD-06, SD-07, SD-08 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Max. Velocity= 3.42 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.31 fps, Avg. Travel Time= 0.4 min Peak Storage= 4 cf @ 12.13 hrs Average Depth at Peak Storage= 0.07' , Surface Width= 1.50' Bank-Full Depth= 1.50' Flow Area= 2.3 sf, Capacity= 29.34 cfs 1.50' x 1.50' deep channel, n= 0.012 Concrete pipe, finished Length= 34.0' Slope= 0.0279 '/' Inlet Invert= 604.25', Outlet Invert= 603.30' Reach 4R: TD-02 Flow (cfs) Hydrograph 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Outflow 0.38 cfs Inflow Area=0.086 ac Avg. Flow Depth=0.07' Max Vel=3.42 fps n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs 0.38 cfs 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