J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 98 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 > 1.87" for 2-Year_Future event Inflow = 0.31 cfs @ 12.14 hrs, Volume= 0.023 af Outflow = 0.31 cfs @ 12.15 hrs, Volume= 0.023 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= 3.25 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.35 fps, Avg. Travel Time= 0.8 min Peak Storage= 6 cf @ 12.15 hrs Average Depth at Peak Storage= 0.06' , 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 0.34 Inflow Area=0.147 ac Avg. Flow Depth=0.06' Max Vel=3.25 fps n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs 0.31 cfs 0.32 0.3 0.28 0.26 0.24 0.22 Flow (cfs) Inflow Outflow 0.31 cfs 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 0.00 0.00 0.00 0.01 0.01 0.03 0.14 0.08 0.04 0.03 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 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 0 1 1 4 3 2 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.01 606.01 606.04 606.03 606.02 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.01 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 606.00 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 0.00 0.00 0.00 0.01 0.01 0.02 0.14 0.08 0.04 0.03 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 0.01 0.01 0.01 Printed 5/13/2024 Page 99

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 100 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 > 1.75" for 2-Year_Future event Inflow = 0.18 cfs @ 12.13 hrs, Volume= 0.013 af Outflow = 0.18 cfs @ 12.13 hrs, Volume= 0.013 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= 2.60 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.27 fps, Avg. Travel Time= 0.4 min Peak Storage= 2 cf @ 12.13 hrs Average Depth at Peak Storage= 0.05' , 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 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Outflow 0.18 cfs Inflow Area=0.086 ac Avg. Flow Depth=0.05' Max Vel=2.60 fps n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs 0.18 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

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.09 0.04 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 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 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.26 604.28 604.27 604.26 604.26 604.26 604.26 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 604.25 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 0.00 0.00 0.00 0.00 0.01 0.01 0.09 0.04 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 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 Printed 5/13/2024 Page 101

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 102 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 > 1.60" for 2-Year_Future event Inflow = 0.43 cfs @ 12.14 hrs, Volume= 0.031 af Outflow = 0.42 cfs @ 12.15 hrs, Volume= 0.031 af, Atten= 1%, Lag= 0.7 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= 1.99 fps, Min. Travel Time= 1.1 min Avg. Velocity = 0.62 fps, Avg. Travel Time= 3.6 min Peak Storage= 28 cf @ 12.15 hrs Average Depth at Peak Storage= 0.14' , 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 Flow (cfs) Hydrograph Inflow Outflow 0.43 cfs 0.46 0.44 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 Area=0.236 ac Avg. Flow Depth=0.14' Max Vel=1.99 fps n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs 0.42 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

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.18 0.11 0.06 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 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 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 0 601.81 1 601.82 3 601.82 5 601.84 16 601.89 12 601.87 8 601.85 6 601.84 6 601.84 5 601.83 4 601.83 4 601.83 4 601.83 4 601.83 4 601.83 3 601.83 3 601.83 3 601.83 3 601.83 3 601.82 3 601.82 3 601.82 3 601.82 3 601.82 3 601.82 2 601.82 2 601.82 2 601.82 2 601.82 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 0.00 0.00 0.00 0.00 0.01 0.03 0.17 0.11 0.06 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 103

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 104 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 > 1.66" for 2-Year_Future event Inflow = 0.30 cfs @ 12.18 hrs, Volume= 0.025 af Outflow = 0.30 cfs @ 12.18 hrs, Volume= 0.025 af, Atten= 0%, Lag= 0.2 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= 2.66 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.03 fps, Avg. Travel Time= 0.9 min Peak Storage= 6 cf @ 12.18 hrs Average Depth at Peak Storage= 0.08' , 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 0.30 cfs 0.32 Inflow Area=0.183 ac Avg. Flow Depth=0.08' Max Vel=2.66 fps n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs 0.30 cfs 0.3 0.28 0.26 0.24 Flow (cfs) 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.11 0.10 0.05 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 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 0 1 1 3 3 2 2 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.77 600.78 600.79 600.81 600.81 600.79 600.79 600.79 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.78 600.77 600.77 600.77 600.77 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 0.00 0.00 0.00 0.00 0.01 0.02 0.11 0.10 0.05 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 0.01 Printed 5/13/2024 Page 105

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 106 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 > 1.69" for 2-Year_Future event 2.25 cfs @ 12.18 hrs, Volume= 0.199 af 2.25 cfs @ 12.18 hrs, Volume= 0.199 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 2.25 cfs Inflow Area=1.409 ac 2.25 cfs 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.05 0.18 0.85 0.79 0.39 0.26 0.20 0.17 0.14 0.12 0.11 0.10 0.09 0.09 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.05 0.18 0.85 0.79 0.39 0.26 0.20 0.17 0.14 0.12 0.11 0.10 0.09 0.09 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 Printed 5/13/2024 Page 107