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 215 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 > 6.40" for 100-Year_Current event Inflow = 1.01 cfs @ 12.15 hrs, Volume= 0.078 af Outflow = 1.01 cfs @ 12.15 hrs, Volume= 0.078 af, Atten= 0%, Lag= 0.1 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= 5.02 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.52 fps, Avg. Travel Time= 0.7 min Peak Storage= 14 cf @ 12.15 hrs Average Depth at Peak Storage= 0.13' , 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 1.01 cfs Inflow Area=0.147 ac Avg. Flow Depth=0.13' Max Vel=5.02 fps n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs 1.01 cfs 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 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 0.01 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 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 2 2 2 3 8 5 4 3 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Elevation (feet) 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.01 606.01 606.01 606.01 606.02 606.02 606.02 606.03 606.08 606.05 606.04 606.03 606.02 606.02 606.02 606.02 606.02 606.02 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 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 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.06 0.12 0.48 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 216

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 217 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 > 6.19" for 100-Year_Current event Inflow = 0.62 cfs @ 12.13 hrs, Volume= 0.044 af Outflow = 0.62 cfs @ 12.13 hrs, Volume= 0.044 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= 4.12 fps, Min. Travel Time= 0.1 min Avg. Velocity = 1.36 fps, Avg. Travel Time= 0.4 min Peak Storage= 5 cf @ 12.13 hrs Average Depth at Peak Storage= 0.10' , 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 Hydrograph Inflow Outflow 0.62 cfs Inflow Area=0.086 ac Avg. Flow Depth=0.10' Max Vel=4.12 fps n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 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 (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 Reach 4R: TD-02 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 0.01 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 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 3 2 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.26 604.26 604.26 604.27 604.27 604.32 604.29 604.28 604.27 604.27 604.27 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.26 604.25 604.25 604.25 604.25 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 0.01 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 218

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 219 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Reach 5R: TD-03 Inflow Area = 0.236 ac, 0.00% Impervious, Inflow Depth > 5.94" for 100-Year_Current event Inflow = 1.54 cfs @ 12.15 hrs, Volume= 0.117 af Outflow = 1.53 cfs @ 12.15 hrs, Volume= 0.117 af, Atten= 1%, Lag= 0.5 min Routed to Pond 16P : SD-09, SD-10 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Max. Velocity= 3.09 fps, Min. Travel Time= 0.7 min Avg. Velocity = 0.87 fps, Avg. Travel Time= 2.6 min Peak Storage= 66 cf @ 12.15 hrs Average Depth at Peak Storage= 0.33' , Surface Width= 1.50' Bank-Full Depth= 1.50' Flow Area= 2.3 sf, Capacity= 11.66 cfs 1.50' x 1.50' deep channel, n= 0.012 Concrete pipe, finished Length= 133.7' Slope= 0.0044 '/' Inlet Invert= 601.81', Outlet Invert= 601.22' Reach 5R: TD-03 Hydrograph Inflow Outflow 1.54 cfs Inflow Area=0.236 ac Avg. Flow Depth=0.33' Max Vel=3.09 fps n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs Flow (cfs) 1.53 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 Reach 5R: TD-03 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 0.01 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 Storage Elevation (cubic-feet) (feet) 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 1 601.81 1 601.82 2 601.82 3 601.83 4 601.83 4 601.83 5 601.84 6 601.84 8 601.85 11 601.86 16 601.89 39 602.01 26 601.94 17 601.90 13 601.88 11 601.87 10 601.86 9 601.85 8 601.85 8 601.85 7 601.85 7 601.84 7 601.84 6 601.84 6 601.84 6 601.84 6 601.84 5 601.84 5 601.84 5 601.84 5 601.84 5 601.83 5 601.83 5 601.83 5 601.83 4 601.83 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 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.09 0.16 0.70 0.36 0.19 0.12 0.10 0.08 0.07 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 220

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 221 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Reach 6R: TD-04 Inflow Area = 0.183 ac, 0.00% Impervious, Inflow Depth > 6.04" for 100-Year_Current event Inflow = 1.06 cfs @ 12.19 hrs, Volume= 0.092 af Outflow = 1.06 cfs @ 12.19 hrs, Volume= 0.092 af, Atten= 0%, Lag= 0.1 min Routed to Pond 20P : SD-11, SD-12 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= 0.2 min Avg. Velocity = 1.25 fps, Avg. Travel Time= 0.7 min Peak Storage= 14 cf @ 12.19 hrs Average Depth at Peak Storage= 0.17' , Surface Width= 1.50' Bank-Full Depth= 1.50' Flow Area= 2.3 sf, Capacity= 22.41 cfs 1.50' x 1.50' deep channel, n= 0.012 Concrete pipe, finished Length= 54.6' Slope= 0.0163 '/' Inlet Invert= 600.77', Outlet Invert= 599.88' Reach 6R: TD-04 Hydrograph Inflow Outflow 1.06 cfs Inflow Area=0.183 ac Avg. Flow Depth=0.17' Max Vel=4.21 fps n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs 1.06 cfs 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 Reach 6R: TD-04 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 0.01 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 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 2 2 4 8 7 4 3 3 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 Elevation (feet) 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.78 600.78 600.78 600.79 600.79 600.79 600.80 600.81 600.87 600.85 600.82 600.81 600.80 600.80 600.80 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.79 600.78 600.78 600.78 600.78 600.78 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 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.07 0.12 0.44 0.33 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 222

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 223 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: O-1A Inflow Area = Inflow = Primary = 1.409 ac, 2.20% Impervious, Inflow Depth > 6.09" for 100-Year_Current event 7.72 cfs @ 12.19 hrs, Volume= 0.716 af 7.72 cfs @ 12.19 hrs, Volume= 0.716 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Pond 7P: O-1A Hydrograph Inflow Primary 7.72 cfs Inflow Area=1.409 ac 7.72 cfs 8 7 Flow (cfs) 6 5 4 3 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 (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 Pond 7P: O-1A 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 Elevation (cfs) (feet) 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 0.08 0.10 0.13 0.18 0.25 0.33 0.53 0.96 3.36 2.69 1.23 0.79 0.58 0.50 0.41 0.35 0.32 0.30 0.27 0.25 0.22 0.20 0.20 0.19 0.19 0.18 0.17 0.17 0.16 0.15 0.15 0.14 0.13 Primary (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 0.02 0.03 0.04 0.08 0.10 0.13 0.18 0.25 0.33 0.53 0.96 3.36 2.69 1.23 0.79 0.58 0.50 0.41 0.35 0.32 0.30 0.27 0.25 0.22 0.20 0.20 0.19 0.19 0.18 0.17 0.17 0.16 0.15 0.15 0.14 0.13 Printed 5/13/2024 Page 224