J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", 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 186 Summary for Pond 12P: SD-03, SD-04, SD-05 Inflow Area = 0.803 ac, 0.00% Impervious, Inflow Depth > 3.49" for 10-Year_Future event Inflow = 2.62 cfs @ 12.18 hrs, Volume= 0.233 af Outflow = 2.62 cfs @ 12.19 hrs, Volume= 0.233 af, Atten= 0%, Lag= 0.2 min Primary = 2.62 cfs @ 12.19 hrs, Volume= 0.233 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= 596.71' @ 12.19 hrs Surf.Area= 86 sf Storage= 42 cf Plug-Flow detention time= 0.6 min calculated for 0.233 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 840.4 - 840.1 ) 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=2.62 cfs @ 12.19 hrs HW=596.71' TW=594.72' (Dynamic Tailwater) 1=SD-05 (Orifice Controls 2.62 cfs @ 2.95 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 187 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 2.62 cfs Inflow Area=0.803 ac Peak Elev=596.71' Storage=42 cf 2.62 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_Future Rainfall=6.36", 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 0.01 0.04 0.06 0.08 0.14 0.28 1.11 0.90 0.43 0.28 0.21 0.18 0.15 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 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 0 595.72 1 595.78 3 595.92 4 595.98 4 595.98 4 595.99 4 595.99 4 596.04 5 596.06 5 596.08 6 596.12 8 596.19 20 596.42 17 596.38 10 596.25 8 596.19 7 596.16 7 596.14 6 596.12 6 596.11 6 596.11 6 596.10 6 596.09 5 596.09 5 596.08 5 596.08 5 596.08 5 596.07 5 596.07 5 596.07 5 596.07 5 596.07 5 596.06 5 596.06 5 596.06 5 596.06 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 0.01 0.04 0.06 0.08 0.14 0.28 1.08 0.91 0.43 0.28 0.21 0.18 0.15 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 Printed 5/13/2024 Page 188

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", 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 189 Summary for Pond 15P: SD-06, SD-07, SD-08 Inflow Area = 0.889 ac, 0.00% Impervious, Inflow Depth > 3.50" for 10-Year_Future event Inflow = 2.88 cfs @ 12.17 hrs, Volume= 0.259 af Outflow = 2.88 cfs @ 12.18 hrs, Volume= 0.259 af, Atten= 0%, Lag= 0.3 min Primary = 2.88 cfs @ 12.18 hrs, Volume= 0.259 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' @ 12.18 hrs Surf.Area= 108 sf Storage= 43 cf Plug-Flow detention time= 0.3 min calculated for 0.259 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 839.6 - 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=2.88 cfs @ 12.18 hrs HW=594.72' TW=593.75' (Dynamic Tailwater) 1=SD-08 (Orifice Controls 2.88 cfs @ 3.03 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 190 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 2.88 cfs Inflow Area=0.889 ac Peak Elev=594.72' Storage=43 cf 3 2.88 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_Future Rainfall=6.36", 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 0.01 0.01 0.04 0.06 0.09 0.16 0.31 1.27 0.99 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 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 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 17 594.43 14 594.37 7 594.23 5 594.17 4 594.14 4 594.12 3 594.10 3 594.09 3 594.08 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 2 594.03 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 0.06 0.09 0.16 0.31 1.25 1.00 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 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 Printed 5/13/2024 Page 191

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", 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 192 Summary for Pond 16P: SD-09, SD-10 Inflow Area = 1.125 ac, 0.00% Impervious, Inflow Depth > 3.48" for 10-Year_Future event Inflow = 3.75 cfs @ 12.17 hrs, Volume= 0.326 af Outflow = 3.75 cfs @ 12.17 hrs, Volume= 0.326 af, Atten= 0%, Lag= 0.4 min Primary = 3.75 cfs @ 12.17 hrs, Volume= 0.326 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= 593.76' @ 12.17 hrs Surf.Area= 136 sf Storage= 73 cf Plug-Flow detention time= 0.7 min calculated for 0.326 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=3.74 cfs @ 12.17 hrs HW=593.75' TW=592.01' (Dynamic Tailwater) 1=SD-10 (Orifice Controls 3.74 cfs @ 3.27 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 193 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 16P: SD-09, SD-10 Hydrograph 4 Inflow Area=1.125 ac Peak Elev=593.76' Storage=73 cf 3.75 cfs 3 Flow (cfs) Inflow Primary 3.75 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_Future Rainfall=6.36", 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 0.01 0.01 0.02 0.05 0.08 0.11 0.20 0.39 1.65 1.21 0.59 0.38 0.29 0.25 0.20 0.18 0.16 0.15 0.14 0.12 0.11 0.10 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 0.07 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 1 592.66 4 592.85 4 592.86 4 592.87 5 592.88 6 592.92 7 592.95 8 592.97 9 593.02 13 593.10 33 593.40 27 593.33 16 593.17 13 593.10 11 593.06 10 593.05 9 593.02 9 593.01 9 593.00 8 593.00 8 592.99 8 592.98 7 592.97 7 592.97 7 592.97 7 592.96 7 592.96 7 592.96 7 592.96 7 592.96 7 592.95 7 592.95 7 592.95 7 592.94 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 0.01 0.05 0.08 0.11 0.20 0.39 1.61 1.22 0.59 0.38 0.29 0.25 0.20 0.18 0.16 0.15 0.14 0.12 0.11 0.10 0.10 0.10 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 Printed 5/13/2024 Page 194

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", 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 195 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 3.48" for 10-Year_Future event Inflow = 4.39 cfs @ 12.17 hrs, Volume= 0.379 af Outflow = 4.38 cfs @ 12.18 hrs, Volume= 0.379 af, Atten= 0%, Lag= 0.3 min Primary = 4.38 cfs @ 12.18 hrs, Volume= 0.379 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= 592.02' @ 12.18 hrs Surf.Area= 141 sf Storage= 80 cf Plug-Flow detention time= 0.8 min calculated for 0.379 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 839.8 - 839.4 ) 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=4.38 cfs @ 12.18 hrs HW=592.02' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 4.38 cfs @ 3.43 fps)