J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 64 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 > 4.94" for 25-Year event Inflow = 1.58 cfs @ 12.46 hrs, Volume= 0.668 af Outflow = 1.58 cfs @ 12.46 hrs, Volume= 0.668 af, Atten= 0%, Lag= 0.1 min Primary = 1.58 cfs @ 12.46 hrs, Volume= 0.668 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' @ 12.46 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.668 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 886.9 - 886.8 ) 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=1.58 cfs @ 12.46 hrs HW=585.49' TW=581.08' (Dynamic Tailwater) 1=SD-24 (Orifice Controls 1.58 cfs @ 2.66 fps) Pond 14P: SD-24 Hydrograph Inflow Primary 1.58 cfs Inflow Area=1.622 ac Peak Elev=585.49' Storage=0.000 af Flow (cfs) 1.58 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" 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 0.11 0.13 0.15 0.17 0.21 0.26 0.32 0.43 0.64 1.56 1.29 1.16 1.08 0.99 0.91 0.85 0.78 0.70 0.61 0.53 0.47 0.40 0.35 0.30 0.26 0.22 0.19 0.17 0.16 0.15 0.14 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 0.000 584.94 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 0.000 585.49 0.000 585.42 0.000 585.39 0.000 585.37 0.000 585.35 0.000 585.33 0.000 585.31 0.000 585.30 0.000 585.27 0.000 585.24 0.000 585.22 0.000 585.20 0.000 585.17 0.000 585.15 0.000 585.13 0.000 585.11 0.000 585.10 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 0.11 0.13 0.15 0.17 0.21 0.26 0.32 0.43 0.64 1.56 1.29 1.16 1.08 0.99 0.91 0.85 0.78 0.70 0.61 0.53 0.47 0.40 0.35 0.30 0.26 0.22 0.19 0.17 0.16 0.15 0.14 0.13 0.12 Printed 5/13/2024 Page 65

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 66 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 3.56" for 25-Year event Inflow = 2.84 cfs @ 12.18 hrs, Volume= 0.264 af Outflow = 2.83 cfs @ 12.19 hrs, Volume= 0.264 af, Atten= 0%, Lag= 0.3 min Primary = 2.83 cfs @ 12.19 hrs, Volume= 0.264 af 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 Peak Elev= 594.72' @ 12.19 hrs Surf.Area= 107 sf Storage= 42 cf Plug-Flow detention time= 0.3 min calculated for 0.264 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 839.7 - 839.4 ) Volume #1 Invert 602.69' Avail.Storage 8 cf #2 #3 595.52' 595.50' 117 cf 35 cf #4 #5 593.92' 593.93' 118 cf 233 cf 511 cf Storage Description 12.0" Round SD-06 L= 10.0' S= 0.0100 '/' MH-04 (Prismatic) Listed below (Recalc) 18.0" Round SD-07 L= 20.0' S= 0.0100 '/' MH-05 (Prismatic) Listed below (Recalc) 18.0" Round SD-08 L= 132.0' S= 0.0100 '/' Total Available Storage Elevation (feet) 595.52 604.53 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 117 Cum.Store (cubic-feet) 0 117 Elevation (feet) 593.92 602.98 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 118 Cum.Store (cubic-feet) 0 118 Device #1 Routing Primary Invert 593.93' Outlet Devices 18.0" Vert. SD-08 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.83 cfs @ 12.19 hrs HW=594.72' TW=593.75' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 2.83 cfs @ 3.02 fps)

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 67 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 15P: SD-06, SD-07, SD-08 Hydrograph Inflow Primary 2.84 cfs 3 Inflow Area=0.889 ac Peak Elev=594.72' Storage=42 cf 2.83 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 15P: SD-06, SD-07, SD-08 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 0.01 0.01 0.04 0.07 0.09 0.16 0.32 1.24 1.05 0.49 0.31 0.24 0.20 0.16 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.08 0.08 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 Storage Elevation (cubic-feet) (feet) 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.92 0 593.94 0 593.94 0 593.95 1 593.96 1 593.97 1 593.97 1 594.02 2 594.04 2 594.06 3 594.10 5 594.17 17 594.42 15 594.39 7 594.24 5 594.17 4 594.14 4 594.12 3 594.11 3 594.09 3 594.09 3 594.08 2 594.07 2 594.07 2 594.06 2 594.05 2 594.05 2 594.05 2 594.05 2 594.05 2 594.04 2 594.04 2 594.04 2 594.04 2 594.04 2 594.03 2 594.03 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 0.01 0.01 0.04 0.07 0.09 0.16 0.31 1.21 1.06 0.49 0.32 0.24 0.20 0.16 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.08 0.08 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 Printed 5/13/2024 Page 68

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 69 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 3.55" for 25-Year event Inflow = 3.71 cfs @ 12.17 hrs, Volume= 0.332 af Outflow = 3.70 cfs @ 12.18 hrs, Volume= 0.332 af, Atten= 0%, Lag= 0.4 min Primary = 3.70 cfs @ 12.18 hrs, Volume= 0.332 af 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 Peak Elev= 593.75' @ 12.18 hrs Surf.Area= 136 sf Storage= 72 cf Plug-Flow detention time= 0.7 min calculated for 0.332 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 839.8 - 839.4 ) Volume #1 Invert 600.62' Avail.Storage 8 cf #2 #3 592.83' 592.83' 123 cf 148 cf #4 592.58' 127 cf 407 cf Storage Description 12.0" Round SD-09 L= 10.0' S= 0.0100 '/' MH-06 (Prismatic) Listed below (Recalc) 18.0" Round SD-10 L= 84.0' S= 0.0100 '/' MH-07 (Prismatic) Listed below (Recalc) Total Available Storage Elevation (feet) 592.83 602.32 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 123 Cum.Store (cubic-feet) 0 123 Elevation (feet) 592.58 602.35 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 127 Cum.Store (cubic-feet) 0 127 Device #1 Routing Primary Invert 592.83' Outlet Devices 18.0" Vert. SD-10 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.70 cfs @ 12.18 hrs HW=593.75' TW=592.01' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 3.70 cfs @ 3.26 fps)

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 70 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 16P: SD-09, SD-10 Hydrograph Inflow Primary 3.71 cfs 4 Inflow Area=1.125 ac Peak Elev=593.75' Storage=72 cf 3.70 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 16P: SD-09, SD-10 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 0.02 0.05 0.08 0.12 0.20 0.40 1.60 1.29 0.61 0.39 0.30 0.25 0.21 0.18 0.17 0.15 0.14 0.13 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 Storage Elevation (cubic-feet) (feet) 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.58 0 592.60 1 592.67 4 592.85 4 592.86 4 592.87 5 592.88 6 592.93 7 592.95 8 592.98 9 593.02 13 593.10 32 593.39 28 593.34 17 593.17 13 593.10 11 593.07 10 593.05 9 593.03 9 593.01 9 593.01 8 593.00 8 592.99 8 592.98 8 592.98 7 592.97 7 592.97 7 592.97 7 592.96 7 592.96 7 592.96 7 592.96 7 592.95 7 592.95 7 592.95 7 592.95 6 592.94 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 0.01 0.01 0.02 0.05 0.08 0.12 0.20 0.40 1.56 1.30 0.61 0.40 0.30 0.25 0.21 0.18 0.17 0.15 0.14 0.13 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 Printed 5/13/2024 Page 71

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 72 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 > 4.93" for 25-Year event Inflow = 1.36 cfs @ 12.45 hrs, Volume= 0.536 af Outflow = 1.36 cfs @ 12.46 hrs, Volume= 0.536 af, Atten= 0%, Lag= 0.1 min Primary = 1.36 cfs @ 12.46 hrs, Volume= 0.536 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' @ 12.46 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.536 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 886.4 - 886.3 ) 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=1.36 cfs @ 12.46 hrs HW=587.36' TW=585.49' (Dynamic Tailwater) 1=SD-23 (Orifice Controls 1.36 cfs @ 2.55 fps) Pond 17P: SD-23 Hydrograph Inflow Primary 1.36 cfs Inflow Area=1.305 ac Peak Elev=587.36' Storage=0.000 af 1.36 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 17P: SD-23 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 0.01 0.02 0.02 0.02 0.03 0.04 0.04 0.06 0.07 0.08 0.10 0.12 0.14 0.17 0.20 0.25 0.34 0.50 1.33 1.06 0.94 0.87 0.80 0.73 0.68 0.63 0.56 0.48 0.42 0.37 0.32 0.27 0.23 0.20 0.18 0.16 0.14 0.13 0.12 0.11 0.10 0.10 Storage Elevation (acre-feet) (feet) 0.000 586.80 0.000 586.80 0.000 586.80 0.000 586.81 0.000 586.82 0.000 586.83 0.000 586.84 0.000 586.85 0.000 586.86 0.000 586.86 0.000 586.87 0.000 586.88 0.000 586.89 0.000 586.90 0.000 586.91 0.000 586.92 0.000 586.93 0.000 586.94 0.000 586.96 0.000 586.97 0.000 586.99 0.000 587.01 0.000 587.03 0.000 587.07 0.000 587.13 0.000 587.36 0.000 587.29 0.000 587.26 0.000 587.24 0.000 587.22 0.000 587.20 0.000 587.18 0.000 587.17 0.000 587.15 0.000 587.12 0.000 587.10 0.000 587.08 0.000 587.06 0.000 587.04 0.000 587.02 0.000 587.01 0.000 586.99 0.000 586.98 0.000 586.97 0.000 586.96 0.000 586.95 0.000 586.95 0.000 586.94 0.000 586.94 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.04 0.06 0.07 0.08 0.10 0.12 0.14 0.17 0.20 0.25 0.34 0.50 1.34 1.06 0.94 0.87 0.80 0.73 0.68 0.63 0.56 0.48 0.42 0.37 0.32 0.27 0.23 0.20 0.18 0.16 0.14 0.13 0.12 0.11 0.10 0.10 Printed 5/13/2024 Page 73