J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 147 Summary for Pond 12P: SD-03, SD-04, SD-05 Inflow Area = 0.803 ac, 0.00% Impervious, Inflow Depth > 2.66" for 10-Year_Current event Inflow = 1.95 cfs @ 12.19 hrs, Volume= 0.178 af Outflow = 1.95 cfs @ 12.20 hrs, Volume= 0.178 af, Atten= 0%, Lag= 0.3 min Primary = 1.95 cfs @ 12.20 hrs, Volume= 0.178 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= 596.60' @ 12.20 hrs Surf.Area= 76 sf Storage= 32 cf Plug-Flow detention time= 0.7 min calculated for 0.178 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 849.8 - 849.4 ) 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=1.94 cfs @ 12.20 hrs HW=596.60' TW=594.60' (Dynamic Tailwater) 1=SD-05 (Orifice Controls 1.94 cfs @ 2.72 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 148 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 1.95 cfs Inflow Area=0.803 ac Peak Elev=596.60' Storage=32 cf 1.95 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", 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 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.05 0.09 0.19 0.78 0.73 0.34 0.22 0.17 0.14 0.12 0.10 0.09 0.09 0.08 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 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 0 595.73 1 595.82 3 595.98 4 595.98 4 595.99 4 595.99 4 596.00 5 596.06 5 596.09 7 596.15 15 596.35 14 596.34 9 596.22 7 596.16 6 596.14 6 596.12 6 596.11 6 596.10 5 596.09 5 596.09 5 596.08 5 596.07 5 596.07 5 596.06 5 596.06 5 596.06 5 596.06 5 596.06 5 596.06 5 596.05 5 596.05 5 596.05 5 596.05 5 596.05 5 596.05 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 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.05 0.09 0.19 0.76 0.74 0.34 0.22 0.17 0.14 0.12 0.10 0.09 0.09 0.08 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 Printed 5/13/2024 Page 149

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 150 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 2.67" for 10-Year_Current event Inflow = 2.14 cfs @ 12.18 hrs, Volume= 0.198 af Outflow = 2.14 cfs @ 12.19 hrs, Volume= 0.198 af, Atten= 0%, Lag= 0.3 min Primary = 2.14 cfs @ 12.19 hrs, Volume= 0.198 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= 594.60' @ 12.19 hrs Surf.Area= 90 sf Storage= 30 cf Plug-Flow detention time= 0.3 min calculated for 0.198 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 848.9 - 848.7 ) 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=2.13 cfs @ 12.19 hrs HW=594.60' TW=593.61' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 2.13 cfs @ 2.79 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 151 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 2.14 cfs Inflow Area=0.889 ac Peak Elev=594.60' Storage=30 cf 2.14 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", 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 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.06 0.11 0.22 0.90 0.81 0.38 0.25 0.18 0.16 0.13 0.11 0.10 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.04 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 0 593.92 0 593.93 0 593.94 0 593.95 0 593.95 1 593.96 1 593.97 1 593.98 2 594.03 2 594.07 4 594.13 12 594.35 12 594.33 6 594.20 4 594.15 3 594.12 3 594.10 3 594.08 2 594.07 2 594.07 2 594.06 2 594.06 2 594.05 2 594.04 2 594.04 2 594.04 2 594.04 2 594.04 2 594.03 2 594.03 2 594.03 2 594.03 2 594.03 2 594.02 1 594.02 1 594.02 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 0.01 0.01 0.06 0.10 0.22 0.88 0.81 0.38 0.25 0.18 0.16 0.13 0.11 0.10 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.04 Printed 5/13/2024 Page 152

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 153 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 2.65" for 10-Year_Current event Inflow = 2.78 cfs @ 12.17 hrs, Volume= 0.249 af Outflow = 2.78 cfs @ 12.18 hrs, Volume= 0.248 af, Atten= 0%, Lag= 0.3 min Primary = 2.78 cfs @ 12.18 hrs, Volume= 0.248 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= 593.61' @ 12.18 hrs Surf.Area= 119 sf Storage= 54 cf Plug-Flow detention time= 0.8 min calculated for 0.248 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 849.1 - 848.6 ) 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=2.78 cfs @ 12.18 hrs HW=593.61' TW=591.85' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 2.78 cfs @ 3.00 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 154 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 2.78 cfs 3 Inflow Area=1.125 ac Peak Elev=593.61' Storage=54 cf 2.78 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 (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", 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 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.07 0.13 0.27 1.16 0.98 0.47 0.31 0.23 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) 0 592.58 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 0 592.61 1 592.70 4 592.85 4 592.86 5 592.88 5 592.89 6 592.94 8 592.99 11 593.06 25 593.31 23 593.27 14 593.13 11 593.07 10 593.04 9 593.02 9 593.00 8 592.99 8 592.99 8 592.98 7 592.97 7 592.97 7 592.96 7 592.95 7 592.95 7 592.95 7 592.95 7 592.95 7 592.94 6 592.94 6 592.94 6 592.94 6 592.94 6 592.93 6 592.93 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 0.01 0.01 0.02 0.07 0.13 0.27 1.13 1.00 0.48 0.31 0.23 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 155

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 156 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 2.65" for 10-Year_Current event Inflow = 3.25 cfs @ 12.18 hrs, Volume= 0.289 af Outflow = 3.25 cfs @ 12.19 hrs, Volume= 0.289 af, Atten= 0%, Lag= 0.3 min Primary = 3.25 cfs @ 12.19 hrs, Volume= 0.289 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= 591.85' @ 12.19 hrs Surf.Area= 116 sf Storage= 58 cf Plug-Flow detention time= 1.0 min calculated for 0.289 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 849.2 - 848.7 ) 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=3.25 cfs @ 12.19 hrs HW=591.85' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 3.25 cfs @ 3.14 fps)