J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 232 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.32 cfs @ 12.85 hrs HW=598.36' TW=585.65' (Dynamic Tailwater) 1=SD-24 Outlet (Elevation F) (Passes 0.32 cfs of 19.78 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.31 cfs @ 9.08 fps) 3=Water Quantity (Elevation H) (Orifice Controls 0.01 cfs @ 0.77 fps) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 6P: BR-04 Hydrograph 3 Inflow Primary 2.68 cfs Inflow Area=0.317 ac Peak Elev=598.36' Storage=3,691 cf Flow (cfs) 2 1 0.32 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_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 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 0.01 0.01 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.11 0.13 0.20 0.34 1.49 0.52 0.27 0.18 0.14 0.12 0.09 0.08 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 0.03 Storage Elevation (cubic-feet) (feet) 0 594.70 0 594.70 5 594.70 17 594.71 32 594.73 48 594.74 63 594.75 77 594.77 90 594.78 102 594.79 114 594.80 125 594.81 136 594.81 148 594.82 163 594.84 180 594.85 199 594.87 219 594.88 242 594.90 278 594.93 334 594.98 410 595.04 544 595.16 821 595.40 1,720 596.17 3,595 598.32 3,680 598.35 3,515 598.30 3,242 598.20 2,946 597.74 2,651 597.27 2,367 596.82 2,110 596.53 1,868 596.31 1,641 596.11 1,427 595.92 1,227 595.75 1,043 595.59 881 595.45 740 595.33 619 595.22 517 595.13 433 595.06 365 595.00 311 594.96 269 594.92 237 594.90 212 594.88 196 594.86 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.10 0.13 0.19 0.31 0.32 0.31 0.30 0.28 0.26 0.23 0.22 0.20 0.19 0.17 0.16 0.15 0.13 0.12 0.11 0.09 0.08 0.07 0.06 0.06 0.05 0.04 0.04 Printed 5/13/2024 Page 233

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 234 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 > 7.61" for 100-Year_Current event 3.61 cfs @ 12.36 hrs, Volume= 1.181 af 3.61 cfs @ 12.36 hrs, Volume= 1.181 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 4 Inflow Primary 3.61 cfs Inflow Area=1.863 ac 3.61 cfs 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

Post-Developed (O-1B) 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 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 0.01 0.02 0.03 0.04 0.05 0.07 0.09 0.10 0.12 0.14 0.16 0.19 0.23 0.26 0.29 0.33 0.39 0.46 0.56 0.73 1.11 3.45 2.48 1.89 1.58 1.45 1.34 1.25 1.17 1.10 1.01 0.89 0.78 0.69 0.62 0.55 0.49 0.44 0.40 0.36 0.32 0.29 0.26 0.24 0.22 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.07 0.09 0.10 0.12 0.14 0.16 0.19 0.23 0.26 0.29 0.33 0.39 0.46 0.56 0.73 1.11 3.45 2.48 1.89 1.58 1.45 1.34 1.25 1.17 1.10 1.01 0.89 0.78 0.69 0.62 0.55 0.49 0.44 0.40 0.36 0.32 0.29 0.26 0.24 0.22 Printed 5/13/2024 Page 235

Post-Developed (O-1B) 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 Printed 5/13/2024 Page 236 Summary for Pond 13P: SD-25, SD-26 Inflow Area = 1.863 ac, 27.41% Impervious, Inflow Depth > 7.61" for 100-Year_Current event Inflow = 3.61 cfs @ 12.36 hrs, Volume= 1.181 af Outflow = 3.61 cfs @ 12.36 hrs, Volume= 1.181 af, Atten= 0%, Lag= 0.1 min Primary = 3.61 cfs @ 12.36 hrs, Volume= 1.181 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= 581.41' @ 12.36 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.0 min calculated for 1.181 af (100% of inflow) Center-of-Mass det. time= 0.0 min ( 877.9 - 877.9 ) 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=3.61 cfs @ 12.36 hrs HW=581.41' TW=0.00' (Dynamic Tailwater) 1=SD-26 (Barrel Controls 3.61 cfs @ 4.25 fps)

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 237 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 13P: SD-25, SD-26 Hydrograph 4 Inflow Primary 3.61 cfs Inflow Area=1.863 ac Peak Elev=581.41' Storage=0.000 af 18.0" Round Culvert n=0.011 L=29.4' S=0.0099 '/' 3.61 cfs 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

Post-Developed (O-1B) 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 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 0.01 0.02 0.03 0.04 0.05 0.07 0.09 0.10 0.12 0.14 0.16 0.19 0.23 0.26 0.29 0.33 0.39 0.46 0.56 0.73 1.11 3.44 2.48 1.89 1.58 1.45 1.34 1.25 1.17 1.10 1.01 0.89 0.78 0.69 0.62 0.55 0.49 0.44 0.40 0.36 0.32 0.29 0.26 0.24 0.22 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 0.000 580.71 0.000 580.74 0.000 580.77 0.000 580.82 0.000 580.92 0.000 581.38 0.000 581.21 0.000 581.10 0.000 581.03 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 0.000 580.81 0.000 580.79 0.000 580.77 0.000 580.75 0.000 580.73 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 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.07 0.09 0.10 0.12 0.14 0.16 0.19 0.23 0.26 0.29 0.33 0.39 0.46 0.56 0.73 1.11 3.45 2.48 1.89 1.58 1.45 1.34 1.25 1.17 1.10 1.01 0.89 0.78 0.69 0.62 0.55 0.49 0.44 0.40 0.36 0.32 0.29 0.26 0.24 0.22 Printed 5/13/2024 Page 238

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 239 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 > 7.60" for 100-Year_Current event Inflow = 3.29 cfs @ 12.36 hrs, Volume= 1.028 af Outflow = 3.29 cfs @ 12.36 hrs, Volume= 1.028 af, Atten= 0%, Lag= 0.2 min Primary = 3.29 cfs @ 12.36 hrs, Volume= 1.028 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= 585.82' @ 12.36 hrs Surf.Area= 0.002 ac Storage= 0.001 af Plug-Flow detention time= 0.1 min calculated for 1.027 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 882.3 - 882.2 ) 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=3.29 cfs @ 12.36 hrs HW=585.82' TW=581.41' (Dynamic Tailwater) 1=SD-24 (Orifice Controls 3.29 cfs @ 3.31 fps) Pond 14P: SD-24 Hydrograph Inflow Primary 3.29 cfs Inflow Area=1.622 ac Peak Elev=585.82' Storage=0.001 af 3.29 cfs 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

Post-Developed (O-1B) 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 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 0.02 0.02 0.03 0.05 0.06 0.07 0.09 0.10 0.12 0.14 0.17 0.19 0.22 0.25 0.28 0.33 0.39 0.47 0.60 0.91 3.12 2.16 1.58 1.29 1.20 1.13 1.07 1.01 0.97 0.89 0.80 0.71 0.63 0.57 0.51 0.46 0.41 0.37 0.33 0.29 0.26 0.24 0.21 0.20 Storage Elevation (acre-feet) (feet) 0.000 584.88 0.000 584.88 0.000 584.88 0.000 584.90 0.000 584.92 0.000 584.93 0.000 584.95 0.000 584.96 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 0.000 585.08 0.000 585.09 0.000 585.11 0.000 585.12 0.000 585.14 0.000 585.17 0.000 585.20 0.000 585.24 0.000 585.33 0.001 585.79 0.000 585.61 0.000 585.49 0.000 585.42 0.000 585.40 0.000 585.39 0.000 585.37 0.000 585.36 0.000 585.35 0.000 585.33 0.000 585.30 0.000 585.27 0.000 585.25 0.000 585.23 0.000 585.21 0.000 585.19 0.000 585.18 0.000 585.16 0.000 585.14 0.000 585.13 0.000 585.11 0.000 585.10 0.000 585.09 0.000 585.08 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.03 0.05 0.06 0.07 0.09 0.10 0.12 0.14 0.17 0.19 0.22 0.25 0.28 0.33 0.39 0.47 0.60 0.91 3.13 2.16 1.58 1.29 1.20 1.13 1.07 1.01 0.97 0.89 0.80 0.71 0.63 0.57 0.51 0.46 0.41 0.37 0.33 0.29 0.26 0.24 0.21 0.20 Printed 5/13/2024 Page 240

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 241 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 > 7.59" for 100-Year_Current event Inflow = 2.99 cfs @ 12.35 hrs, Volume= 0.825 af Outflow = 2.99 cfs @ 12.36 hrs, Volume= 0.825 af, Atten= 0%, Lag= 0.2 min Primary = 2.99 cfs @ 12.36 hrs, Volume= 0.825 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= 587.69' @ 12.36 hrs Surf.Area= 0.001 ac Storage= 0.001 af Plug-Flow detention time= 0.1 min calculated for 0.825 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 878.1 - 878.0 ) 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=2.99 cfs @ 12.36 hrs HW=587.69' TW=585.82' (Dynamic Tailwater) 1=SD-23 (Orifice Controls 2.99 cfs @ 3.21 fps) Pond 17P: SD-23 Hydrograph Inflow Primary 2.99 cfs Inflow Area=1.305 ac Peak Elev=587.69' Storage=0.001 af 2.99 cfs 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