J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (25-Year) West Orange HydroCAD_Post Printed 5/13/2024 Page 5 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.503 0.000 0.503 0.000 0.000 0.000 1.147 0.000 1.147 0.000 0.000 0.000 0.542 0.000 0.542 0.000 0.000 0.000 1.081 0.000 1.081 0.000 0.000 0.000 3.272 0.000 3.272 >75% Grass cover, Good 4S, 5S, 6S, 7S, 8S, 9S, 10S, 11S, 12S, 13S, 14S Brush, Good 4S, 6S, 8S, 10S, 13S, 14S Impervious, Pavement 5S, 7S, 9S, 11S, 12S, 13S Yard Stone/Gravel Pad 4S, 5S, 7S, 9S, 11S, 12S, 14S TOTAL AREA

Post-Developed (25-Year) West Orange HydroCAD_Post Printed 5/13/2024 Page 6 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line# 1 Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 13P 580.44 580.15 29.4 0.0099 0.011 0.0 18.0 0.0 Node Name

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 Printed 5/13/2024 Page 7 Time span=0.00-24.00 hrs, dt=0.0100 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 4S: PO-DA B Runoff Area=28,575 sf 0.00% Impervious Runoff Depth>3.52" Flow Length=298' Tc=13.4 min CN=WQ Runoff=2.09 cfs 0.192 af Subcatchment 5S: PO-DA C Runoff Area=24,698 sf 17.46% Impervious Runoff Depth>4.91" Flow Length=164' Tc=18.6 min CN=WQ Runoff=2.09 cfs 0.232 af Runoff Area=6,403 sf 0.00% Impervious Runoff Depth>3.86" Flow Length=85' Slope=0.1773 '/' Tc=7.6 min CN=WQ Runoff=0.62 cfs 0.047 af Subcatchment 6S: PO-DA D Subcatchment 7S: PO-DA E Runoff Area=15,246 sf 31.71% Impervious Runoff Depth>5.10" Flow Length=175' Tc=15.6 min CN=WQ Runoff=1.42 cfs 0.149 af Runoff Area=3,746 sf 0.00% Impervious Runoff Depth>3.69" Flow Length=66' Slope=0.2264 '/' Tc=5.6 min CN=WQ Runoff=0.38 cfs 0.026 af Subcatchment 8S: PO-DA F Subcatchment 9S: PO-DA G Runoff Area=16,902 sf 28.87% Impervious Runoff Depth>5.03" Flow Length=175' Tc=23.4 min CN=WQ Runoff=1.30 cfs 0.163 af Runoff Area=10,281 sf 0.00% Impervious Runoff Depth>3.48" Flow Length=82' Slope=0.1736 '/' Tc=7.5 min CN=WQ Runoff=0.92 cfs 0.068 af Subcatchment 10S: PO-DA H Subcatchment 11S: PO-DA I Runoff Area=10,507 sf 27.64% Impervious Runoff Depth>5.03" Flow Length=120' Tc=6.5 min CN=WQ Runoff=1.30 cfs 0.101 af Runoff Area=13,809 sf 38.48% Impervious Runoff Depth>5.14" Flow Length=96' Slope=0.0336 '/' Tc=5.4 min CN=WQ Runoff=1.79 cfs 0.136 af Subcatchment 12S: PO-DA J Subcatchment 13S: PO-DA K Runoff Area=4,400 sf 30.68% Impervious Runoff Depth>4.47" Flow Length=239' Tc=14.4 min CN=WQ Runoff=0.37 cfs 0.038 af Subcatchment 14S: PO-DA L Runoff Area=7,972 sf 0.00% Impervious Runoff Depth>3.56" Flow Length=116' Tc=11.1 min CN=WQ Runoff=0.63 cfs 0.054 af Reach 3R: TD-01 Avg. Flow Depth=0.10' Max Vel=4.21 fps Inflow=0.62 cfs 0.047 af n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs Outflow=0.62 cfs 0.047 af Reach 4R: TD-02 Avg. Flow Depth=0.07' Max Vel=3.42 fps Inflow=0.38 cfs 0.026 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.38 cfs 0.026 af Reach 5R: TD-03 Avg. Flow

.62 cfs 0.047 af Reach 4R: TD-02 Avg. Flow Depth=0.07' Max Vel=3.42 fps Inflow=0.38 cfs 0.026 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.38 cfs 0.026 af Reach 5R: TD-03 Avg. Flow Depth=0.23' Max Vel=2.60 fps Inflow=0.92 cfs 0.068 af n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs Outflow=0.91 cfs 0.068 af Reach 6R: TD-04 Avg. Flow Depth=0.12' Max Vel=3.49 fps Inflow=0.63 cfs 0.054 af n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs Outflow=0.63 cfs 0.054 af Pond 1P: BR-01 Peak Elev=600.60' Storage=3,897 cf Inflow=2.09 cfs 0.232 af Outflow=0.45 cfs 0.229 af

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 Printed 5/13/2024 Page 8 Pond 2P: BR-02 Peak Elev=601.23' Storage=1,818 cf Inflow=1.42 cfs 0.149 af Outflow=0.77 cfs 0.147 af Pond 3P: BR-03 Peak Elev=597.59' Storage=2,630 cf Inflow=1.30 cfs 0.163 af Outflow=0.31 cfs 0.160 af Pond 5P: BR-05 Peak Elev=596.30' Storage=1,417 cf Inflow=1.30 cfs 0.101 af Outflow=0.25 cfs 0.100 af Pond 6P: BR-04 Peak Elev=596.75' Storage=2,324 cf Inflow=1.79 cfs 0.136 af Outflow=0.23 cfs 0.132 af Pond 7P: O-1A Inflow=4.68 cfs 0.424 af Primary=4.68 cfs 0.424 af Pond 8P: O-1B Inflow=1.83 cfs 0.768 af Primary=1.83 cfs 0.768 af Pond 12P: SD-03, SD-04, SD-05 Pond 13P: SD-25, SD-26 Peak Elev=596.71' Storage=41 cf Inflow=2.59 cfs 0.238 af Outflow=2.58 cfs 0.238 af Peak Elev=581.08' Storage=0.000 af Inflow=1.83 cfs 0.768 af 18.0" Round Culvert n=0.011 L=29.4' S=0.0099 '/' Outflow=1.83 cfs 0.768 af Pond 14P: SD-24 Peak Elev=585.49' Storage=0.000 af Inflow=1.58 cfs 0.668 af Outflow=1.58 cfs 0.668 af Pond 15P: SD-06, SD-07, SD-08 Peak Elev=594.72' Storage=42 cf Inflow=2.84 cfs 0.264 af Outflow=2.83 cfs 0.264 af Pond 16P: SD-09, SD-10 Peak Elev=593.75' Storage=72 cf Inflow=3.71 cfs 0.332 af Outflow=3.70 cfs 0.332 af Pond 17P: SD-23 Peak Elev=587.36' Storage=0.000 af Inflow=1.36 cfs 0.536 af Outflow=1.36 cfs 0.536 af Pond 18P: SD-22 Peak Elev=588.99' Storage=0.000 af Inflow=1.10 cfs 0.376 af Outflow=1.10 cfs 0.376 af Pond 19P: SD-21 Peak Elev=590.94' Storage=0.000 af Inflow=0.45 cfs 0.229 af Outflow=0.45 cfs 0.229 af Pond 20P: SD-11, SD-12 Peak Elev=592.01' Storage=79 cf Inflow=4.33 cfs 0.387 af Outflow=4.32 cfs 0.386 af Pond 23P: SD-01, SD-02 Peak Elev=597.85' Storage=96 cf Inflow=2.09 cfs 0.192 af Outflow=2.09 cfs 0.190 af Total Runoff Area = 3.272 ac Runoff Volume = 1.207 af Average Runoff Depth = 4.43" 83.45% Pervious = 2.731 ac 16.55% Impervious = 0.542 ac

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 9 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: PO-DA B Runoff = 2.09 cfs @ 12.22 hrs, Volume= Routed to Pond 23P : SD-01, SD-02 0.192 af, Depth> 3.52" 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) 1,873 610 26,092 28,575 28,575 * 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) 11.4 100 0.0900 0.15 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.42" 0.3 64 0.1920 3.07 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 1.7 134 0.0094 1.34 8.07 Channel Flow, North Channel Area= 6.0 sf Perim= 9.3' r= 0.65' n= 0.080 Earth, long dense weeds 13.4 298 Total Subcatchment 4S: PO-DA B Hydrograph Runoff 2.09 cfs NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=28,575 sf Runoff Volume=0.192 af Runoff Depth>3.52" Flow Length=298' Tc=13.4 min CN=WQ Flow (cfs) 2 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 4S: PO-DA B 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 0.01 0.01 0.02 0.03 0.04 0.06 0.11 0.22 0.79 0.81 0.36 0.23 0.17 0.15 0.12 0.10 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 Printed 5/13/2024 Page 10

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 11 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: PO-DA C Runoff = 2.09 cfs @ 12.26 hrs, Volume= Routed to Pond 1P : BR-01 0.232 af, Depth> 4.91" 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) 4,312 2,396 17,990 24,698 20,386 4,312 * CN 98 80 85 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 82.54% Pervious Area 17.46% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 100 0.0018 0.09 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 3.42" 0.6 64 0.0106 1.66 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 18.6 164 Total Subcatchment 5S: PO-DA C Hydrograph Runoff 2.09 cfs NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=24,698 sf Runoff Volume=0.232 af Runoff Depth>4.91" Flow Length=164' Tc=18.6 min CN=WQ Flow (cfs) 2 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 5S: PO-DA C 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 0.01 5.50 0.49 0.02 6.00 0.55 0.04 6.50 0.61 0.05 7.00 0.68 0.08 7.50 0.75 0.11 8.00 0.84 0.14 8.50 0.93 0.18 9.00 1.02 0.24 9.50 1.14 0.30 10.00 1.28 0.39 10.50 1.44 0.50 11.00 1.67 0.66 11.50 2.04 0.94 12.00 3.09 1.81 12.50 4.40 3.00 13.00 4.77 3.35 13.50 5.00 3.57 14.00 5.16 3.72 14.50 5.30 3.85 15.00 5.42 3.96 15.50 5.51 4.05 16.00 5.60 4.14 16.50 5.69 4.22 17.00 5.76 4.29 17.50 5.83 4.35 18.00 5.89 4.41 18.50 5.95 4.47 19.00 6.00 4.52 19.50 6.05 4.57 20.00 6.10 4.62 20.50 6.15 4.66 21.00 6.20 4.71 21.50 6.24 4.75 22.00 6.29 4.79 22.50 6.33 4.83 23.00 6.37 4.87 23.50 6.40 4.90 24.00 6.44 4.94 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.10 0.12 0.18 0.30 0.79 1.16 0.42 0.26 0.18 0.15 0.13 0.10 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 Printed 5/13/2024 Page 12

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 13 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: PO-DA D Runoff = 0.62 cfs @ 12.15 hrs, Volume= Routed to Reach 3R : TD-01 0.047 af, Depth> 3.86" 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) 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 Hydrograph Runoff 0.65 0.62 cfs NOAA 24-hr D 25-Year Rainfall=6.44" P2=3.42" Runoff Area=6,403 sf Runoff Volume=0.047 af Runoff Depth>3.86" Flow Length=85' Slope=0.1773 '/' Tc=7.6 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