J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 272 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.44 cfs @ 12.74 hrs HW=598.73' TW=585.83' (Dynamic Tailwater) 1=SD-24 Outlet (Elevation F) (Passes 0.44 cfs of 20.11 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.33 cfs @ 9.55 fps) 3=Water Quantity (Elevation H) (Orifice Controls 0.12 cfs @ 2.76 fps) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 6P: BR-04 Hydrograph Inflow Primary 3.49 cfs Inflow Area=0.317 ac Peak Elev=598.73' Storage=4,782 cf Flow (cfs) 3 2 1 0.44 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 100-Year_Future Rainfall=11.58", 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 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.11 0.14 0.17 0.27 0.44 1.99 0.66 0.35 0.22 0.18 0.15 0.12 0.11 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 Storage Elevation (cubic-feet) (feet) 0 594.70 0 594.70 10 594.71 28 594.72 48 594.74 67 594.76 85 594.77 101 594.79 117 594.80 132 594.81 147 594.82 160 594.83 172 594.84 187 594.86 206 594.87 229 594.89 256 594.91 288 594.94 324 594.97 378 595.01 461 595.09 572 595.18 762 595.35 1,147 595.68 2,374 596.83 4,710 598.71 4,736 598.72 4,460 598.62 4,091 598.50 3,757 598.38 3,435 598.27 3,092 597.97 2,772 597.46 2,481 597.00 2,219 596.63 1,972 596.40 1,737 596.19 1,516 596.00 1,316 595.82 1,136 595.67 975 595.53 834 595.41 711 595.30 604 595.21 514 595.13 439 595.07 377 595.01 326 594.97 286 594.94 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.15 0.23 0.44 0.44 0.42 0.37 0.33 0.31 0.29 0.27 0.24 0.22 0.21 0.19 0.18 0.17 0.15 0.14 0.13 0.12 0.10 0.09 0.08 0.08 0.07 0.06 Printed 5/13/2024 Page 273

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 274 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 > 9.86" for 100-Year_Future event 5.00 cfs @ 12.29 hrs, Volume= 1.530 af 5.00 cfs @ 12.29 hrs, Volume= 1.530 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 Inflow Primary 5.00 cfs Inflow Area=1.863 ac 5.00 cfs 5 Flow (cfs) 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", 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 0.01 0.02 0.03 0.05 0.07 0.09 0.11 0.14 0.16 0.18 0.21 0.24 0.27 0.31 0.35 0.39 0.43 0.51 0.59 0.70 0.91 1.35 4.26 3.26 2.62 1.98 1.67 1.54 1.45 1.34 1.26 1.18 1.11 1.04 0.91 0.80 0.72 0.65 0.59 0.54 0.49 0.45 0.41 0.37 0.34 0.31 Primary (cfs) 0.00 0.00 0.00 0.01 0.02 0.03 0.05 0.07 0.09 0.11 0.14 0.16 0.18 0.21 0.24 0.27 0.31 0.35 0.39 0.43 0.51 0.59 0.70 0.91 1.35 4.26 3.26 2.62 1.98 1.67 1.54 1.45 1.34 1.26 1.18 1.11 1.04 0.91 0.80 0.72 0.65 0.59 0.54 0.49 0.45 0.41 0.37 0.34 0.31 Printed 5/13/2024 Page 275

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 276 Summary for Pond 13P: SD-25, SD-26 Inflow Area = 1.863 ac, 27.41% Impervious, Inflow Depth > 9.86" for 100-Year_Future event Inflow = 5.00 cfs @ 12.29 hrs, Volume= 1.530 af Outflow = 5.00 cfs @ 12.29 hrs, Volume= 1.530 af, Atten= 0%, Lag= 0.2 min Primary = 5.00 cfs @ 12.29 hrs, Volume= 1.530 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= 581.63' @ 12.29 hrs Surf.Area= 0.002 ac Storage= 0.001 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.0 min ( 873.2 - 873.1 ) 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=5.00 cfs @ 12.29 hrs HW=581.63' TW=0.00' (Dynamic Tailwater) 1=SD-26 (Barrel Controls 5.00 cfs @ 4.54 fps)

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 277 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 13P: SD-25, SD-26 Hydrograph Inflow Primary 5.00 cfs Inflow Area=1.863 ac Peak Elev=581.63' Storage=0.001 af 18.0" Round Culvert n=0.011 L=29.4' S=0.0099 '/' 5.00 cfs 5 Flow (cfs) 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", 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 0.01 0.02 0.03 0.05 0.07 0.09 0.11 0.14 0.16 0.18 0.21 0.24 0.27 0.31 0.35 0.39 0.43 0.51 0.59 0.71 0.91 1.35 4.26 3.26 2.62 1.98 1.67 1.54 1.45 1.34 1.26 1.18 1.11 1.04 0.91 0.80 0.72 0.65 0.59 0.54 0.49 0.45 0.41 0.37 0.34 0.31 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 0.000 580.70 0.000 580.71 0.000 580.73 0.000 580.75 0.000 580.78 0.000 580.81 0.000 580.87 0.000 580.98 0.000 581.52 0.000 581.35 0.000 581.24 0.000 581.11 0.000 581.05 0.000 581.02 0.000 581.00 0.000 580.98 0.000 580.96 0.000 580.94 0.000 580.92 0.000 580.90 0.000 580.87 0.000 580.84 0.000 580.82 0.000 580.80 0.000 580.78 0.000 580.76 0.000 580.75 0.000 580.73 0.000 580.72 0.000 580.71 0.000 580.70 0.000 580.69 Primary (cfs) 0.00 0.00 0.00 0.01 0.02 0.03 0.05 0.07 0.09 0.11 0.14 0.16 0.18 0.21 0.24 0.27 0.31 0.35 0.39 0.43 0.51 0.59 0.70 0.91 1.35 4.26 3.26 2.62 1.98 1.67 1.54 1.45 1.34 1.26 1.18 1.11 1.04 0.91 0.80 0.72 0.65 0.59 0.54 0.49 0.45 0.41 0.37 0.34 0.31 Printed 5/13/2024 Page 278

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 279 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 > 9.85" for 100-Year_Future event Inflow = 4.68 cfs @ 12.28 hrs, Volume= 1.331 af Outflow = 4.67 cfs @ 12.29 hrs, Volume= 1.331 af, Atten= 0%, Lag= 0.5 min Primary = 4.67 cfs @ 12.29 hrs, Volume= 1.331 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= 586.13' @ 12.29 hrs Surf.Area= 0.002 ac Storage= 0.001 af Plug-Flow detention time= 0.1 min calculated for 1.331 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 875.5 - 875.4 ) 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=4.67 cfs @ 12.29 hrs HW=586.13' TW=581.63' (Dynamic Tailwater) 1=SD-24 (Orifice Controls 4.67 cfs @ 3.80 fps) Pond 14P: SD-24 Hydrograph 5 Inflow Area=1.622 ac Peak Elev=586.13' Storage=0.001 af 4.67 cfs 4 Flow (cfs) Inflow Primary 4.68 cfs 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Future Rainfall=11.58", 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 0.01 0.03 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.23 0.26 0.29 0.33 0.37 0.43 0.50 0.59 0.76 1.11 3.91 2.92 2.28 1.65 1.35 1.23 1.18 1.12 1.06 1.01 0.97 0.91 0.81 0.72 0.65 0.60 0.54 0.50 0.45 0.41 0.37 0.34 0.31 0.28 Storage Elevation (acre-feet) (feet) 0.000 584.88 0.000 584.88 0.000 584.89 0.000 584.91 0.000 584.93 0.000 584.95 0.000 584.97 0.000 584.99 0.000 585.01 0.000 585.02 0.000 585.04 0.000 585.05 0.000 585.06 0.000 585.07 0.000 585.09 0.000 585.10 0.000 585.11 0.000 585.13 0.000 585.14 0.000 585.16 0.000 585.18 0.000 585.21 0.000 585.24 0.000 585.29 0.000 585.38 0.001 585.95 0.001 585.75 0.000 585.63 0.000 585.51 0.000 585.44 0.000 585.41 0.000 585.40 0.000 585.38 0.000 585.37 0.000 585.36 0.000 585.35 0.000 585.33 0.000 585.30 0.000 585.28 0.000 585.26 0.000 585.24 0.000 585.22 0.000 585.21 0.000 585.19 0.000 585.18 0.000 585.16 0.000 585.15 0.000 585.13 0.000 585.12 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.03 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.23 0.26 0.29 0.33 0.37 0.43 0.50 0.59 0.76 1.10 3.92 2.92 2.29 1.65 1.35 1.23 1.18 1.12 1.06 1.01 0.97 0.91 0.81 0.72 0.65 0.60 0.54 0.50 0.45 0.41 0.37 0.34 0.31 0.28 Printed 5/13/2024 Page 280

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 281 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 > 9.83" for 100-Year_Future event Inflow = 4.27 cfs @ 12.27 hrs, Volume= 1.069 af Outflow = 4.26 cfs @ 12.28 hrs, Volume= 1.069 af, Atten= 0%, Lag= 0.3 min Primary = 4.26 cfs @ 12.28 hrs, Volume= 1.069 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= 587.94' @ 12.28 hrs Surf.Area= 0.002 ac Storage= 0.001 af Plug-Flow detention time= 0.1 min calculated for 1.069 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 869.9 - 869.8 ) 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=4.26 cfs @ 12.28 hrs HW=587.94' TW=586.13' (Dynamic Tailwater) 1=SD-23 (Orifice Controls 4.26 cfs @ 3.63 fps) Pond 17P: SD-23 Hydrograph Inflow Primary 4.27 cfs Inflow Area=1.305 ac Peak Elev=587.94' Storage=0.001 af 4.26 cfs 4 Flow (cfs) 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