J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 192 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.23 cfs @ 12.77 hrs HW=596.69' TW=585.43' (Dynamic Tailwater) 1=SD-24 Outlet (Elevation F) (Passes 0.23 cfs of 18.25 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.23 cfs @ 6.62 fps) 3=Water Quantity (Elevation H) ( Controls 0.00 cfs) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 6P: BR-04 Hydrograph 2 Inflow Primary 1.79 cfs Flow (cfs) Inflow Area=0.317 ac Peak Elev=596.69' Storage=2,285 cf 1 0.23 cfs 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 6P: BR-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 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.06 0.08 0.13 0.21 1.00 0.34 0.18 0.12 0.09 0.08 0.06 0.06 0.05 0.05 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 0.02 Storage Elevation (cubic-feet) (feet) 0 594.70 0 594.70 1 594.70 7 594.71 16 594.71 26 594.72 37 594.73 48 594.74 58 594.75 67 594.76 75 594.76 83 594.77 91 594.78 99 594.78 110 594.79 122 594.80 136 594.81 150 594.83 164 594.84 184 594.85 214 594.88 253 594.91 326 594.97 487 595.11 1,056 595.60 2,241 596.65 2,268 596.68 2,133 596.55 1,936 596.37 1,732 596.18 1,523 596.00 1,318 595.83 1,129 595.66 957 595.51 803 595.38 665 595.26 544 595.16 441 595.07 359 595.00 295 594.95 247 594.91 213 594.88 190 594.86 175 594.85 165 594.84 157 594.83 152 594.83 147 594.82 142 594.82 Primary (cfs) 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 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.07 0.09 0.15 0.22 0.22 0.22 0.21 0.19 0.18 0.17 0.15 0.14 0.12 0.11 0.10 0.08 0.07 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.02 Printed 5/13/2024 Page 193

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 194 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 8P: O-1B Inflow Area = Inflow = Primary = 1.863 ac, 27.41% Impervious, Inflow Depth > 4.87" for 10-Year_Future event 1.81 cfs @ 12.45 hrs, Volume= 0.756 af 1.81 cfs @ 12.45 hrs, Volume= 0.756 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 8P: O-1B Hydrograph 2 Inflow Primary 1.81 cfs Inflow Area=1.863 ac Flow (cfs) 1.81 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 8P: O-1B 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 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.05 0.07 0.08 0.10 0.12 0.15 0.17 0.20 0.25 0.30 0.38 0.51 0.79 1.78 1.48 1.36 1.25 1.14 1.04 0.95 0.86 0.76 0.65 0.56 0.49 0.42 0.36 0.31 0.27 0.24 0.21 0.19 0.17 0.16 0.15 0.14 0.14 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.05 0.07 0.08 0.10 0.12 0.15 0.17 0.20 0.25 0.30 0.38 0.51 0.79 1.78 1.48 1.36 1.25 1.14 1.04 0.95 0.86 0.76 0.65 0.56 0.49 0.42 0.36 0.31 0.27 0.24 0.21 0.19 0.17 0.16 0.15 0.14 0.14 Printed 5/13/2024 Page 195

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 196 Summary for Pond 13P: SD-25, SD-26 Inflow Area = 1.863 ac, 27.41% Impervious, Inflow Depth > 4.87" for 10-Year_Future event Inflow = 1.81 cfs @ 12.45 hrs, Volume= 0.756 af Outflow = 1.81 cfs @ 12.45 hrs, Volume= 0.756 af, Atten= 0%, Lag= 0.1 min Primary = 1.81 cfs @ 12.45 hrs, Volume= 0.756 af Routed to Pond 8P : O-1B Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 581.08' @ 12.45 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.0 min ( 880.7 - 880.7 ) Volume #1 Device #1 Invert 580.69' Routing Primary Avail.Storage 0.007 af Invert 580.44' Storage Description 15.0" Round SD-25 L= 262.4' S= 0.0150 '/' Outlet Devices 18.0" Round SD-26 L= 29.4' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 580.44' / 580.15' S= 0.0099 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.77 sf Primary OutFlow Max=1.81 cfs @ 12.45 hrs HW=581.08' TW=0.00' (Dynamic Tailwater) 1=SD-26 (Barrel Controls 1.81 cfs @ 3.72 fps)

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 197 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 13P: SD-25, SD-26 Hydrograph Flow (cfs) 2 Inflow Primary 1.81 cfs Inflow Area=1.863 ac Peak Elev=581.08' Storage=0.000 af 18.0" Round Culvert n=0.011 L=29.4' S=0.0099 '/' 1 1.81 cfs 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 13P: SD-25, SD-26 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 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.05 0.07 0.08 0.10 0.12 0.15 0.17 0.20 0.25 0.30 0.38 0.51 0.79 1.78 1.48 1.36 1.25 1.14 1.04 0.95 0.86 0.76 0.65 0.56 0.49 0.42 0.36 0.31 0.27 0.24 0.21 0.19 0.17 0.16 0.15 0.14 0.14 Storage Elevation (acre-feet) (feet) 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.71 0.000 580.75 0.000 580.84 0.000 581.07 0.000 581.01 0.000 580.98 0.000 580.96 0.000 580.93 0.000 580.90 0.000 580.88 0.000 580.86 0.000 580.83 0.000 580.80 0.000 580.77 0.000 580.75 0.000 580.72 0.000 580.70 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 0.000 580.69 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.05 0.07 0.08 0.10 0.12 0.15 0.17 0.20 0.25 0.30 0.38 0.51 0.79 1.78 1.48 1.36 1.25 1.14 1.04 0.95 0.86 0.76 0.65 0.56 0.49 0.42 0.36 0.31 0.27 0.24 0.21 0.19 0.17 0.16 0.15 0.14 0.14 Printed 5/13/2024 Page 198

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 199 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 14P: SD-24 Inflow Area = 1.622 ac, 27.37% Impervious, Inflow Depth > 4.87" for 10-Year_Future event Inflow = 1.56 cfs @ 12.44 hrs, Volume= 0.658 af Outflow = 1.56 cfs @ 12.45 hrs, Volume= 0.658 af, Atten= 0%, Lag= 0.1 min Primary = 1.56 cfs @ 12.45 hrs, Volume= 0.658 af Routed to Pond 13P : SD-25, SD-26 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 585.49' @ 12.45 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.658 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 886.0 - 885.9 ) Volume #1 Device #1 Invert 584.88' Avail.Storage 0.003 af Routing Primary Invert 584.88' Storage Description 15.0" Round SD-24 L= 111.3' S= 0.0150 '/' Outlet Devices 15.0" Vert. SD-24 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.56 cfs @ 12.45 hrs HW=585.48' TW=581.08' (Dynamic Tailwater) 1=SD-24 (Orifice Controls 1.56 cfs @ 2.65 fps) Pond 14P: SD-24 Hydrograph Inflow Primary 1.56 cfs Inflow Area=1.622 ac Peak Elev=585.49' Storage=0.000 af Flow (cfs) 1.56 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 14P: SD-24 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 0.01 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.09 0.10 0.13 0.15 0.17 0.21 0.26 0.32 0.43 0.65 1.53 1.25 1.15 1.07 0.98 0.90 0.84 0.77 0.69 0.60 0.52 0.46 0.39 0.34 0.29 0.25 0.22 0.19 0.17 0.15 0.14 0.13 0.13 0.12 Storage Elevation (acre-feet) (feet) 0.000 584.88 0.000 584.88 0.000 584.88 0.000 584.89 0.000 584.90 0.000 584.91 0.000 584.92 0.000 584.93 0.000 584.94 0.000 584.95 0.000 584.96 0.000 584.97 0.000 584.98 0.000 584.99 0.000 585.00 0.000 585.01 0.000 585.03 0.000 585.04 0.000 585.05 0.000 585.07 0.000 585.09 0.000 585.11 0.000 585.14 0.000 585.18 0.000 585.25 0.000 585.48 0.000 585.41 0.000 585.39 0.000 585.37 0.000 585.35 0.000 585.33 0.000 585.31 0.000 585.29 0.000 585.27 0.000 585.24 0.000 585.22 0.000 585.19 0.000 585.17 0.000 585.15 0.000 585.13 0.000 585.11 0.000 585.09 0.000 585.08 0.000 585.07 0.000 585.06 0.000 585.05 0.000 585.05 0.000 585.04 0.000 585.04 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.09 0.10 0.13 0.15 0.17 0.21 0.26 0.32 0.43 0.65 1.53 1.25 1.15 1.07 0.98 0.90 0.84 0.77 0.69 0.60 0.52 0.46 0.39 0.34 0.29 0.25 0.22 0.19 0.17 0.15 0.14 0.13 0.13 0.12 Printed 5/13/2024 Page 200

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 201 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 17P: SD-23 Inflow Area = 1.305 ac, 24.67% Impervious, Inflow Depth > 4.85" for 10-Year_Future event Inflow = 1.34 cfs @ 12.44 hrs, Volume= 0.528 af Outflow = 1.34 cfs @ 12.44 hrs, Volume= 0.528 af, Atten= 0%, Lag= 0.1 min Primary = 1.34 cfs @ 12.44 hrs, Volume= 0.528 af Routed to Pond 14P : SD-24 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 587.36' @ 12.44 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.528 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 885.5 - 885.4 ) Volume #1 Device #1 Invert 586.80' Avail.Storage 0.003 af Routing Primary Invert 586.80' Storage Description 15.0" Round SD-23 L= 93.7' S= 0.0150 '/' Outlet Devices 15.0" Vert. SD-23 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.34 cfs @ 12.44 hrs HW=587.36' TW=585.48' (Dynamic Tailwater) 1=SD-23 (Orifice Controls 1.34 cfs @ 2.54 fps) Pond 17P: SD-23 Hydrograph Inflow Primary 1.34 cfs Inflow Area=1.305 ac Peak Elev=587.36' Storage=0.000 af 1.34 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