J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 108 Summary for Pond 12P: SD-03, SD-04, SD-05 Inflow Area = 0.803 ac, 0.00% Impervious, Inflow Depth > 1.64" for 2-Year_Future event Inflow = 1.23 cfs @ 12.19 hrs, Volume= 0.110 af Outflow = 1.23 cfs @ 12.19 hrs, Volume= 0.110 af, Atten= 0%, Lag= 0.2 min Primary = 1.23 cfs @ 12.19 hrs, Volume= 0.110 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= 596.46' @ 12.19 hrs Surf.Area= 70 sf Storage= 22 cf Plug-Flow detention time= 1.0 min calculated for 0.110 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 865.1 - 864.6 ) 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=1.23 cfs @ 12.19 hrs HW=596.46' TW=594.45' (Dynamic Tailwater) 1=SD-05 (Orifice Controls 1.23 cfs @ 2.40 fps)

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 109 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 1.23 cfs Inflow Area=0.803 ac Peak Elev=596.46' Storage=22 cf 1.23 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.10 0.47 0.45 0.22 0.15 0.11 0.09 0.08 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 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 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 0 595.71 1 595.76 2 595.86 3 595.98 4 595.98 4 595.99 4 596.01 5 596.09 10 596.26 10 596.26 7 596.16 6 596.13 6 596.10 5 596.09 5 596.08 5 596.07 5 596.07 5 596.06 5 596.06 5 596.05 5 596.05 5 596.05 5 596.05 5 596.04 4 596.04 4 596.04 4 596.04 4 596.04 4 596.04 4 596.04 4 596.03 4 596.03 4 596.03 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 0.00 0.00 0.00 0.00 0.01 0.01 0.10 0.46 0.46 0.22 0.15 0.11 0.09 0.08 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Printed 5/13/2024 Page 110

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 111 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 1.65" for 2-Year_Future event Inflow = 1.36 cfs @ 12.18 hrs, Volume= 0.122 af Outflow = 1.36 cfs @ 12.18 hrs, Volume= 0.122 af, Atten= 0%, Lag= 0.3 min Primary = 1.36 cfs @ 12.18 hrs, Volume= 0.122 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= 594.45' @ 12.18 hrs Surf.Area= 68 sf Storage= 19 cf Plug-Flow detention time= 0.4 min calculated for 0.122 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 864.1 - 863.8 ) 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=1.35 cfs @ 12.18 hrs HW=594.45' TW=593.43' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 1.35 cfs @ 2.46 fps)

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 112 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 1.36 cfs Inflow Area=0.889 ac Peak Elev=594.45' Storage=19 cf 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.11 0.55 0.50 0.25 0.16 0.12 0.10 0.09 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 Storage (cubic-feet) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 2 8 7 4 3 3 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 Elevation (feet) 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.92 593.93 593.94 593.95 593.96 593.97 593.99 594.07 594.25 594.24 594.15 594.10 594.08 594.07 594.06 594.05 594.04 594.04 594.03 594.03 594.02 594.02 594.02 594.02 594.02 594.02 594.01 594.01 594.01 594.01 594.01 594.01 594.00 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 0.00 0.00 0.00 0.00 0.01 0.02 0.11 0.54 0.50 0.25 0.16 0.12 0.10 0.09 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 Printed 5/13/2024 Page 113

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 114 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 1.64" for 2-Year_Future event Inflow = 1.76 cfs @ 12.17 hrs, Volume= 0.154 af Outflow = 1.76 cfs @ 12.17 hrs, Volume= 0.153 af, Atten= 0%, Lag= 0.3 min Primary = 1.76 cfs @ 12.17 hrs, Volume= 0.153 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= 593.43' @ 12.17 hrs Surf.Area= 93 sf Storage= 36 cf Plug-Flow detention time= 1.0 min calculated for 0.153 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 864.3 - 863.8 ) 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=1.76 cfs @ 12.17 hrs HW=593.43' TW=591.66' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 1.76 cfs @ 2.64 fps)

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 115 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 1.76 cfs Inflow Area=1.125 ac Peak Elev=593.43' Storage=36 cf Flow (cfs) 1.76 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.03 0.14 0.70 0.61 0.31 0.20 0.15 0.13 0.11 0.09 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 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 0 592.58 0 592.58 0 592.58 0 592.58 0 592.59 1 592.63 3 592.78 4 592.86 4 592.88 5 592.90 8 592.99 18 593.19 17 593.18 11 593.07 9 593.03 8 593.00 8 592.99 7 592.97 7 592.96 7 592.96 7 592.95 7 592.95 6 592.94 6 592.94 6 592.93 6 592.93 6 592.93 6 592.93 6 592.93 6 592.92 6 592.92 6 592.92 6 592.92 6 592.92 6 592.92 6 592.91 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 0.00 0.00 0.00 0.01 0.01 0.03 0.13 0.68 0.61 0.31 0.20 0.15 0.13 0.11 0.09 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 Printed 5/13/2024 Page 116

Post-Developed (O-1A) NOAA 24-hr D 2-Year_Future Rainfall=4.07", P2=4.07" 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 117 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 1.64" for 2-Year_Future event Inflow = 2.06 cfs @ 12.18 hrs, Volume= 0.179 af Outflow = 2.06 cfs @ 12.18 hrs, Volume= 0.179 af, Atten= 0%, Lag= 0.3 min Primary = 2.06 cfs @ 12.18 hrs, Volume= 0.179 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= 591.66' @ 12.18 hrs Surf.Area= 88 sf Storage= 39 cf Plug-Flow detention time= 1.4 min calculated for 0.178 af (100% of inflow) Center-of-Mass det. time= 0.6 min ( 864.4 - 863.8 ) 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=2.06 cfs @ 12.18 hrs HW=591.66' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 2.06 cfs @ 2.76 fps)