J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) 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 225 Summary for Pond 12P: SD-03, SD-04, SD-05 Inflow Area = 0.803 ac, 0.00% Impervious, Inflow Depth > 6.03" for 100-Year_Current event Inflow = 4.29 cfs @ 12.20 hrs, Volume= 0.404 af Outflow = 4.29 cfs @ 12.20 hrs, Volume= 0.403 af, Atten= 0%, Lag= 0.3 min Primary = 4.29 cfs @ 12.20 hrs, Volume= 0.403 af 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 Peak Elev= 596.96' @ 12.20 hrs Surf.Area= 110 sf Storage= 67 cf Plug-Flow detention time= 0.5 min calculated for 0.403 af (100% of inflow) Center-of-Mass det. time= 0.3 min ( 823.4 - 823.1 ) Volume #1 Invert 603.40' Avail.Storage 8 cf #2 #3 596.79' 596.56' 79 cf 16 cf #4 #5 596.31' 595.95' 86 cf 64 cf #6 595.71' 93 cf 346 cf Storage Description 12.0" Round SD-03 L= 10.0' S= 0.0100 '/' MH-02 (Prismatic) Listed below (Recalc) 12.0" Round SD-04 L= 20.0' S= 0.0100 '/' MH-03 (Prismatic) Listed below (Recalc) 18.0" Round SD-05 L= 36.0' S= 0.0100 '/' MH-04 (Prismatic) Listed below (Recalc) Total Available Storage Elevation (feet) 596.79 602.90 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 79 Cum.Store (cubic-feet) 0 79 Elevation (feet) 596.31 602.90 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 86 Cum.Store (cubic-feet) 0 86 Elevation (feet) 595.71 602.90 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 93 Cum.Store (cubic-feet) 0 93 Device #1 Routing Primary Invert 595.96' Outlet Devices 18.0" Vert. SD-05 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.29 cfs @ 12.20 hrs HW=596.96' TW=594.99' (Dynamic Tailwater) 1=SD-05 (Orifice Controls 4.29 cfs @ 3.41 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 226 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 12P: SD-03, SD-04, SD-05 Hydrograph Inflow Primary 4.29 cfs Inflow Area=0.803 ac Peak Elev=596.96' Storage=67 cf 4.29 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

Post-Developed (O-1A) 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 12P: SD-03, SD-04, SD-05 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 0.01 0.01 0.04 0.06 0.07 0.10 0.14 0.18 0.30 0.54 1.89 1.55 0.70 0.45 0.33 0.28 0.23 0.20 0.18 0.17 0.16 0.14 0.13 0.12 0.11 0.11 0.11 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 Storage Elevation (cubic-feet) (feet) 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.72 1 595.82 3 595.98 4 595.98 4 595.99 4 595.99 4 596.00 5 596.05 5 596.06 5 596.07 6 596.10 6 596.12 7 596.15 8 596.20 11 596.28 31 596.58 27 596.53 14 596.33 10 596.25 9 596.21 8 596.19 7 596.17 7 596.15 7 596.15 7 596.14 6 596.13 6 596.12 6 596.11 6 596.11 6 596.10 6 596.10 6 596.10 6 596.10 6 596.09 5 596.09 5 596.09 5 596.09 5 596.08 5 596.08 5 596.08 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 0.01 0.01 0.04 0.06 0.07 0.10 0.14 0.18 0.30 0.54 1.85 1.57 0.70 0.45 0.33 0.28 0.23 0.20 0.18 0.17 0.16 0.14 0.13 0.12 0.11 0.11 0.11 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 Printed 5/13/2024 Page 227

Post-Developed (O-1A) 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 228 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 6.04" for 100-Year_Current event Inflow = 4.69 cfs @ 12.18 hrs, Volume= 0.448 af Outflow = 4.69 cfs @ 12.19 hrs, Volume= 0.448 af, Atten= 0%, Lag= 0.4 min Primary = 4.69 cfs @ 12.19 hrs, Volume= 0.448 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= 594.99' @ 12.19 hrs Surf.Area= 147 sf Storage= 77 cf Plug-Flow detention time= 0.3 min calculated for 0.448 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 822.7 - 822.5 ) 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=4.69 cfs @ 12.19 hrs HW=594.99' TW=594.10' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 4.69 cfs @ 3.51 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 229 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 5 Inflow Area=0.889 ac Peak Elev=594.99' Storage=77 cf 4.69 cfs 4 Flow (cfs) Inflow Primary 4.69 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-1A) 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 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 0.01 0.01 0.01 0.05 0.06 0.08 0.11 0.15 0.20 0.33 0.60 2.18 1.70 0.77 0.49 0.37 0.31 0.26 0.22 0.20 0.19 0.17 0.16 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 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 0 593.93 0 593.94 0 593.95 0 593.96 1 593.96 1 593.97 1 593.98 2 594.02 2 594.04 2 594.05 2 594.07 3 594.10 4 594.13 5 594.18 9 594.27 30 594.60 24 594.52 11 594.32 7 594.24 6 594.19 5 594.17 4 594.15 4 594.13 4 594.13 4 594.12 3 594.11 3 594.10 3 594.09 3 594.08 3 594.08 3 594.08 3 594.08 3 594.07 2 594.07 2 594.07 2 594.07 2 594.06 2 594.06 2 594.06 2 594.05 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 0.01 0.01 0.01 0.05 0.06 0.08 0.11 0.15 0.20 0.33 0.60 2.13 1.71 0.77 0.50 0.37 0.31 0.26 0.22 0.20 0.19 0.17 0.16 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 Printed 5/13/2024 Page 230

Post-Developed (O-1A) 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 231 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 6.02" for 100-Year_Current event Inflow = 6.14 cfs @ 12.17 hrs, Volume= 0.565 af Outflow = 6.13 cfs @ 12.18 hrs, Volume= 0.564 af, Atten= 0%, Lag= 0.4 min Primary = 6.13 cfs @ 12.18 hrs, Volume= 0.564 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= 594.10' @ 12.18 hrs Surf.Area= 144 sf Storage= 123 cf Plug-Flow detention time= 0.5 min calculated for 0.564 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 822.7 - 822.4 ) 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=6.13 cfs @ 12.18 hrs HW=594.10' TW=592.44' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 6.13 cfs @ 3.84 fps)

Post-Developed (O-1A) 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 Pond 16P: SD-09, SD-10 Hydrograph Inflow Primary 6.14 cfs Inflow Area=1.125 ac Peak Elev=594.10' Storage=123 cf 6.13 cfs 6 Flow (cfs) 5 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-1A) 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 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 0.01 0.01 0.02 0.06 0.08 0.10 0.14 0.19 0.26 0.42 0.77 2.83 2.07 0.97 0.62 0.46 0.39 0.32 0.28 0.26 0.24 0.22 0.20 0.18 0.16 0.16 0.15 0.15 0.14 0.14 0.13 0.13 0.12 0.12 0.11 0.11 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 0 592.61 2 592.73 4 592.86 4 592.87 5 592.88 5 592.89 6 592.93 7 592.95 7 592.97 8 592.99 9 593.02 10 593.05 13 593.11 19 593.22 54 593.60 42 593.49 22 593.27 17 593.18 14 593.13 13 593.10 12 593.08 11 593.06 10 593.05 10 593.04 10 593.03 9 593.02 9 593.01 9 593.00 8 593.00 8 593.00 8 593.00 8 592.99 8 592.99 8 592.99 8 592.98 8 592.98 8 592.98 7 592.97 7 592.97 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 0.01 0.01 0.02 0.06 0.08 0.10 0.14 0.19 0.26 0.42 0.76 2.75 2.10 0.97 0.62 0.46 0.39 0.32 0.28 0.26 0.24 0.22 0.20 0.18 0.16 0.16 0.15 0.15 0.14 0.14 0.13 0.13 0.12 0.12 0.11 0.11 Printed 5/13/2024 Page 233

Post-Developed (O-1A) 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 234 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 6.02" for 100-Year_Current event Inflow = 7.18 cfs @ 12.18 hrs, Volume= 0.656 af Outflow = 7.15 cfs @ 12.19 hrs, Volume= 0.656 af, Atten= 0%, Lag= 0.6 min Primary = 7.15 cfs @ 12.19 hrs, Volume= 0.656 af Routed to Pond 7P : O-1A Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 592.45' @ 12.19 hrs Surf.Area= 188 sf Storage= 151 cf Plug-Flow detention time= 0.6 min calculated for 0.656 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 822.9 - 822.5 ) Volume #1 Invert 600.17' Avail.Storage 8 cf #2 591.00' 277 cf #3 590.26' 83 cf 368 cf Elevation (feet) 590.26 596.63 Device #1 Routing Primary Surf.Area (sq-ft) 13 13 Invert 591.00' Storage Description 12.0" Round SD-11 L= 10.0' S= 0.0100 '/' 18.0" Round SD-12 L= 157.0' S= 0.0100 '/' MH-08 (Existing) (Prismatic)Listed below (Recalc) Total Available Storage Inc.Store (cubic-feet) 0 83 Cum.Store (cubic-feet) 0 83 Outlet Devices 18.0" Vert. SD-12 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=7.15 cfs @ 12.19 hrs HW=592.45' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 7.15 cfs @ 4.09 fps)