J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 205 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: PO-DA D Runoff = 1.01 cfs @ 12.15 hrs, Volume= Routed to Reach 3R : TD-01 0.078 af, Depth> 6.40" 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 100-Year_Current Rainfall=9.23", P2=3.45" 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= 3.45" Subcatchment 6S: PO-DA D Hydrograph Runoff 1.01 cfs NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=6,403 sf Runoff Volume=0.078 af Runoff Depth>6.40" Flow Length=85' Slope=0.1773 '/' Tc=7.6 min CN=WQ Flow (cfs) 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.05 0.00 1.00 0.11 0.00 1.50 0.16 0.00 2.00 0.22 0.00 2.50 0.28 0.00 3.00 0.35 0.00 3.50 0.41 0.00 4.00 0.48 0.00 4.50 0.56 0.00 5.00 0.63 0.00 5.50 0.71 0.00 6.00 0.79 0.01 6.50 0.88 0.02 7.00 0.97 0.04 7.50 1.08 0.07 8.00 1.20 0.10 8.50 1.33 0.14 9.00 1.46 0.20 9.50 1.63 0.26 10.00 1.83 0.36 10.50 2.07 0.48 11.00 2.40 0.68 11.50 2.93 1.02 12.00 4.42 2.15 12.50 6.30 3.75 13.00 6.83 4.21 13.50 7.16 4.51 14.00 7.40 4.73 14.50 7.60 4.91 15.00 7.77 5.06 15.50 7.90 5.19 16.00 8.03 5.30 16.50 8.15 5.41 17.00 8.26 5.51 17.50 8.35 5.60 18.00 8.44 5.68 18.50 8.52 5.76 19.00 8.60 5.83 19.50 8.67 5.90 20.00 8.75 5.96 20.50 8.82 6.03 21.00 8.88 6.09 21.50 8.95 6.15 22.00 9.01 6.21 22.50 9.07 6.26 23.00 9.12 6.31 23.50 9.18 6.37 24.00 9.23 6.41 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 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.07 0.12 0.49 0.23 0.12 0.08 0.06 0.05 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 0.01 0.01 Printed 5/13/2024 Page 206

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 207 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: PO-DA F Runoff = 0.62 cfs @ 12.13 hrs, Volume= Routed to Reach 4R : TD-02 0.044 af, Depth> 6.19" 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 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.20 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" Subcatchment 8S: PO-DA F Hydrograph Runoff 0.65 0.62 cfs NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=3,746 sf Runoff Volume=0.044 af Runoff Depth>6.19" Flow Length=66' Slope=0.2264 '/' Tc=5.6 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

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.05 0.00 1.00 0.11 0.00 1.50 0.16 0.00 2.00 0.22 0.00 2.50 0.28 0.00 3.00 0.35 0.00 3.50 0.41 0.00 4.00 0.48 0.00 4.50 0.56 0.00 5.00 0.63 0.00 5.50 0.71 0.00 6.00 0.79 0.00 6.50 0.88 0.01 7.00 0.97 0.03 7.50 1.08 0.05 8.00 1.20 0.07 8.50 1.33 0.11 9.00 1.46 0.15 9.50 1.63 0.22 10.00 1.83 0.30 10.50 2.07 0.41 11.00 2.40 0.59 11.50 2.93 0.91 12.00 4.42 1.99 12.50 6.30 3.54 13.00 6.83 4.00 13.50 7.16 4.29 14.00 7.40 4.50 14.50 7.60 4.68 15.00 7.77 4.83 15.50 7.90 4.96 16.00 8.03 5.07 16.50 8.15 5.18 17.00 8.26 5.27 17.50 8.35 5.36 18.00 8.44 5.44 18.50 8.52 5.51 19.00 8.60 5.59 19.50 8.67 5.65 20.00 8.75 5.72 20.50 8.82 5.78 21.00 8.88 5.84 21.50 8.95 5.90 22.00 9.01 5.96 22.50 9.07 6.01 23.00 9.12 6.07 23.50 9.18 6.12 24.00 9.23 6.16 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 0.01 0.01 0.02 0.02 0.04 0.07 0.33 0.13 0.07 0.04 0.03 0.03 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 0.01 0.01 Printed 5/13/2024 Page 208

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 209 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 10S: PO-DA H Runoff = 1.54 cfs @ 12.15 hrs, Volume= Routed to Reach 5R : TD-03 0.117 af, Depth> 5.94" 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 100-Year_Current Rainfall=9.23", P2=3.45" 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) 7.4 82 0.1736 0.18 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" Subcatchment 10S: PO-DA H Hydrograph Runoff Flow (cfs) 1.54 cfs NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=10,281 sf Runoff Volume=0.117 af Runoff Depth>5.94" Flow Length=82' Slope=0.1736 '/' Tc=7.4 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.05 0.00 1.00 0.11 0.00 1.50 0.16 0.00 2.00 0.22 0.00 2.50 0.28 0.00 3.00 0.35 0.00 3.50 0.41 0.00 4.00 0.48 0.00 4.50 0.56 0.00 5.00 0.63 0.00 5.50 0.71 0.00 6.00 0.79 0.00 6.50 0.88 0.00 7.00 0.97 0.01 7.50 1.08 0.03 8.00 1.20 0.05 8.50 1.33 0.08 9.00 1.46 0.12 9.50 1.63 0.17 10.00 1.83 0.25 10.50 2.07 0.35 11.00 2.40 0.51 11.50 2.93 0.81 12.00 4.42 1.84 12.50 6.30 3.34 13.00 6.83 3.79 13.50 7.16 4.08 14.00 7.40 4.28 14.50 7.60 4.46 15.00 7.77 4.60 15.50 7.90 4.73 16.00 8.03 4.84 16.50 8.15 4.94 17.00 8.26 5.04 17.50 8.35 5.13 18.00 8.44 5.20 18.50 8.52 5.27 19.00 8.60 5.34 19.50 8.67 5.41 20.00 8.75 5.48 20.50 8.82 5.54 21.00 8.88 5.60 21.50 8.95 5.66 22.00 9.01 5.71 22.50 9.07 5.77 23.00 9.12 5.82 23.50 9.18 5.87 24.00 9.23 5.91 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 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.09 0.17 0.74 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 0.03 0.02 0.02 0.02 Printed 5/13/2024 Page 210

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 211 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: PO-DA K Runoff = 0.59 cfs @ 12.22 hrs, Volume= Routed to Pond 7P : O-1A 0.059 af, Depth> 7.06" 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 100-Year_Current Rainfall=9.23", P2=3.45" 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) 12.0 100 0.0772 0.14 Sheet Flow, Woodland Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" 2.3 139 0.0424 1.03 Shallow Concentrated Flow, Shallow Concentrated Flow Woodland Kv= 5.0 fps 14.3 239 Total Subcatchment 13S: PO-DA K Hydrograph 0.65 Runoff 0.59 cfs 0.6 NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=4,400 sf Runoff Volume=0.059 af Runoff Depth>7.06" Flow Length=239' Tc=14.3 min CN=WQ 0.55 0.5 0.45 Flow (cfs) 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.05 0.00 1.00 0.11 0.00 1.50 0.16 0.00 2.00 0.22 0.00 2.50 0.28 0.00 3.00 0.35 0.00 3.50 0.41 0.00 4.00 0.48 0.00 4.50 0.56 0.01 5.00 0.63 0.02 5.50 0.71 0.03 6.00 0.79 0.05 6.50 0.88 0.07 7.00 0.97 0.10 7.50 1.08 0.14 8.00 1.20 0.19 8.50 1.33 0.26 9.00 1.46 0.33 9.50 1.63 0.42 10.00 1.83 0.54 10.50 2.07 0.69 11.00 2.40 0.92 11.50 2.93 1.32 12.00 4.42 2.57 12.50 6.30 4.27 13.00 6.83 4.76 13.50 7.16 5.07 14.00 7.40 5.29 14.50 7.60 5.48 15.00 7.77 5.64 15.50 7.90 5.77 16.00 8.03 5.89 16.50 8.15 6.00 17.00 8.26 6.10 17.50 8.35 6.20 18.00 8.44 6.28 18.50 8.52 6.36 19.00 8.60 6.43 19.50 8.67 6.50 20.00 8.75 6.57 20.50 8.82 6.64 21.00 8.88 6.70 21.50 8.95 6.76 22.00 9.01 6.82 22.50 9.07 6.88 23.00 9.12 6.93 23.50 9.18 6.98 24.00 9.23 7.03 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.05 0.08 0.24 0.23 0.10 0.06 0.04 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 Printed 5/13/2024 Page 212

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 213 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: PO-DA L Runoff = 1.06 cfs @ 12.19 hrs, Volume= Routed to Reach 6R : TD-04 0.092 af, Depth> 6.04" 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 100-Year_Current Rainfall=9.23", P2=3.45" 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= 3.45" 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 1.06 cfs NOAA 24-hr D 100-Year_Current Rainfall=9.23" P2=3.45" Runoff Area=7,972 sf Runoff Volume=0.092 af Runoff Depth>6.04" Flow Length=116' Tc=11.1 min CN=WQ Flow (cfs) 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" 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 0.05 0.00 1.00 0.11 0.00 1.50 0.16 0.00 2.00 0.22 0.00 2.50 0.28 0.00 3.00 0.35 0.00 3.50 0.41 0.00 4.00 0.48 0.00 4.50 0.56 0.00 5.00 0.63 0.00 5.50 0.71 0.00 6.00 0.79 0.00 6.50 0.88 0.01 7.00 0.97 0.02 7.50 1.08 0.04 8.00 1.20 0.06 8.50 1.33 0.09 9.00 1.46 0.14 9.50 1.63 0.19 10.00 1.83 0.27 10.50 2.07 0.38 11.00 2.40 0.55 11.50 2.93 0.86 12.00 4.42 1.91 12.50 6.30 3.44 13.00 6.83 3.89 13.50 7.16 4.18 14.00 7.40 4.39 14.50 7.60 4.57 15.00 7.77 4.72 15.50 7.90 4.84 16.00 8.03 4.95 16.50 8.15 5.06 17.00 8.26 5.16 17.50 8.35 5.24 18.00 8.44 5.32 18.50 8.52 5.39 19.00 8.60 5.46 19.50 8.67 5.53 20.00 8.75 5.60 20.50 8.82 5.66 21.00 8.88 5.72 21.50 8.95 5.78 22.00 9.01 5.84 22.50 9.07 5.89 23.00 9.12 5.94 23.50 9.18 5.99 24.00 9.23 6.04 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 0.02 0.02 0.03 0.04 0.07 0.12 0.45 0.32 0.16 0.10 0.08 0.06 0.05 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 Printed 5/13/2024 Page 214