J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) 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 264 Summary for Pond 12P: SD-03, SD-04, SD-05 Inflow Area = 0.803 ac, 0.00% Impervious, Inflow Depth > 8.21" for 100-Year_Future event Inflow = 5.81 cfs @ 12.19 hrs, Volume= 0.550 af Outflow = 5.81 cfs @ 12.20 hrs, Volume= 0.549 af, Atten= 0%, Lag= 0.3 min Primary = 5.81 cfs @ 12.20 hrs, Volume= 0.549 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= 597.18' @ 12.20 hrs Surf.Area= 108 sf Storage= 91 cf Plug-Flow detention time= 0.4 min calculated for 0.549 af (100% of inflow) Center-of-Mass det. time= 0.3 min ( 813.0 - 812.7 ) 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=5.80 cfs @ 12.20 hrs HW=597.18' TW=595.23' (Dynamic Tailwater) 1=SD-05 (Orifice Controls 5.80 cfs @ 3.76 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 265 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 5.81 cfs Inflow Area=0.803 ac Peak Elev=597.18' Storage=91 cf 5.81 cfs 6 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-1A) 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 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 0.01 0.01 0.05 0.06 0.08 0.10 0.12 0.16 0.22 0.28 0.44 0.78 2.72 1.96 0.91 0.58 0.43 0.37 0.30 0.26 0.24 0.22 0.20 0.18 0.16 0.15 0.15 0.14 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.10 0.10 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 1 595.78 3 595.97 4 595.98 4 595.99 4 595.99 4 596.00 5 596.05 5 596.07 5 596.08 6 596.10 6 596.11 6 596.13 7 596.16 8 596.19 10 596.25 15 596.35 42 596.72 33 596.60 17 596.38 12 596.30 10 596.25 9 596.22 8 596.20 8 596.18 7 596.17 7 596.16 7 596.15 7 596.14 6 596.13 6 596.13 6 596.12 6 596.12 6 596.12 6 596.12 6 596.11 6 596.11 6 596.11 6 596.10 6 596.10 6 596.10 6 596.09 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 0.01 0.01 0.05 0.06 0.08 0.10 0.12 0.16 0.22 0.28 0.44 0.78 2.67 1.97 0.91 0.58 0.43 0.37 0.30 0.26 0.24 0.22 0.20 0.18 0.16 0.15 0.15 0.14 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.10 0.10 Printed 5/13/2024 Page 266

Post-Developed (O-1A) 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 267 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 8.23" for 100-Year_Future event Inflow = 6.31 cfs @ 12.18 hrs, Volume= 0.609 af Outflow = 6.31 cfs @ 12.19 hrs, Volume= 0.609 af, Atten= 0%, Lag= 0.5 min Primary = 6.31 cfs @ 12.19 hrs, Volume= 0.609 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= 595.23' @ 12.19 hrs Surf.Area= 176 sf Storage= 115 cf Plug-Flow detention time= 0.3 min calculated for 0.609 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 812.3 - 812.1 ) 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=6.30 cfs @ 12.19 hrs HW=595.23' TW=594.50' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 6.30 cfs @ 3.88 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 268 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 7 Inflow Primary 6.31 cfs Inflow Area=0.889 ac Peak Elev=595.23' Storage=115 cf 6.31 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_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 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 0.01 0.01 0.01 0.05 0.07 0.09 0.11 0.13 0.18 0.24 0.31 0.50 0.87 3.12 2.14 1.00 0.64 0.48 0.40 0.33 0.28 0.26 0.24 0.22 0.20 0.18 0.17 0.16 0.16 0.15 0.15 0.14 0.14 0.13 0.12 0.12 0.11 0.11 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 0 593.94 0 593.94 0 593.96 1 593.96 1 593.97 1 593.98 2 594.03 2 594.04 2 594.06 2 594.07 3 594.09 3 594.11 4 594.14 5 594.17 7 594.24 12 594.34 46 594.75 31 594.61 14 594.38 9 594.28 7 594.23 6 594.21 5 594.18 5 594.16 5 594.15 4 594.14 4 594.13 4 594.12 3 594.11 3 594.11 3 594.10 3 594.10 3 594.10 3 594.09 3 594.09 3 594.09 3 594.09 3 594.08 3 594.08 3 594.08 2 594.07 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.05 0.07 0.09 0.11 0.13 0.18 0.24 0.31 0.49 0.87 3.05 2.16 1.00 0.64 0.48 0.40 0.33 0.28 0.26 0.24 0.22 0.20 0.18 0.17 0.16 0.16 0.15 0.15 0.14 0.14 0.13 0.12 0.12 0.11 0.11 Printed 5/13/2024 Page 269

Post-Developed (O-1A) 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 270 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 8.20" for 100-Year_Future event Inflow = 8.29 cfs @ 12.16 hrs, Volume= 0.769 af Outflow = 8.28 cfs @ 12.17 hrs, Volume= 0.769 af, Atten= 0%, Lag= 0.4 min Primary = 8.28 cfs @ 12.17 hrs, Volume= 0.769 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= 594.53' @ 12.17 hrs Surf.Area= 99 sf Storage= 176 cf Plug-Flow detention time= 0.5 min calculated for 0.769 af (100% of inflow) Center-of-Mass det. time= 0.3 min ( 812.4 - 812.0 ) 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=8.28 cfs @ 12.17 hrs HW=594.53' TW=593.03' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 8.28 cfs @ 4.68 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 271 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 8.29 cfs 9 Inflow Area=1.125 ac Peak Elev=594.53' Storage=176 cf 8.28 cfs 8 7 Flow (cfs) 6 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_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 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 0.01 0.01 0.01 0.02 0.06 0.09 0.11 0.14 0.17 0.23 0.30 0.39 0.63 1.11 4.07 2.63 1.25 0.80 0.60 0.51 0.41 0.36 0.33 0.31 0.28 0.25 0.23 0.21 0.20 0.20 0.19 0.18 0.18 0.17 0.16 0.16 0.15 0.14 0.14 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 0 592.59 1 592.69 4 592.86 4 592.87 5 592.88 5 592.89 6 592.94 7 592.96 7 592.97 8 592.99 9 593.01 10 593.04 11 593.07 13 593.10 17 593.18 25 593.30 77 593.79 52 593.59 27 593.33 20 593.23 16 593.17 15 593.14 13 593.11 12 593.09 12 593.08 11 593.07 11 593.06 10 593.05 10 593.04 10 593.03 9 593.03 9 593.02 9 593.02 9 593.02 9 593.01 9 593.01 9 593.00 8 593.00 8 593.00 8 592.99 8 592.99 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.06 0.09 0.11 0.14 0.17 0.23 0.30 0.39 0.62 1.10 3.95 2.66 1.26 0.80 0.60 0.51 0.42 0.36 0.33 0.31 0.28 0.25 0.23 0.21 0.20 0.20 0.19 0.18 0.18 0.17 0.16 0.16 0.15 0.14 0.14 Printed 5/13/2024 Page 272

Post-Developed (O-1A) 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 273 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 8.20" for 100-Year_Future event Inflow = 9.74 cfs @ 12.17 hrs, Volume= 0.894 af Outflow = 9.69 cfs @ 12.18 hrs, Volume= 0.894 af, Atten= 1%, Lag= 0.7 min Primary = 9.69 cfs @ 12.18 hrs, Volume= 0.894 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= 593.05' @ 12.18 hrs Surf.Area= 141 sf Storage= 256 cf Plug-Flow detention time= 0.6 min calculated for 0.894 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 812.5 - 812.1 ) 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=9.68 cfs @ 12.18 hrs HW=593.04' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 9.68 cfs @ 5.48 fps)