J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) 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 142 Summary for Pond 2P: BR-02 Inflow Area = 0.350 ac, 31.71% Impervious, Inflow Depth > 4.08" for 10-Year_Current event Inflow = 1.14 cfs @ 12.23 hrs, Volume= 0.119 af Outflow = 0.33 cfs @ 12.67 hrs, Volume= 0.117 af, Atten= 71%, Lag= 26.3 min Primary = 0.33 cfs @ 12.67 hrs, Volume= 0.117 af Routed to Pond 18P : SD-22 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 601.13' @ 12.67 hrs Surf.Area= 4,734 sf Storage= 1,649 cf Plug-Flow detention time= 68.8 min calculated for 0.117 af (99% of inflow) Center-of-Mass det. time= 60.1 min ( 855.1 - 794.9 ) Volume #1 #2 Invert 599.50' 599.00' Avail.Storage 1,303 cf 296 cf #3 598.00' 627 cf #4 598.00' 12 cf 2,237 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 789 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 1,578 cf Overall - 12 cf Embedded = 1,566 cf x 40.0% Voids 4.0" Round 4" Underdrain Pipe Inside #3 L= 133.4' S= 0.0001 '/' Total Available Storage Elevation (feet) 599.50 601.00 601.50 Surf.Area Voids (sq-ft) (%) 1,578 0.0 1,578 21.7 1,578 100.0 Elevation (feet) 599.00 599.50 Surf.Area (sq-ft) 1,578 1,578 Inc.Store (cubic-feet) 0 789 Cum.Store (cubic-feet) 0 789 Elevation (feet) 598.00 599.00 Surf.Area (sq-ft) 1,578 1,578 Inc.Store (cubic-feet) 0 1,578 Cum.Store (cubic-feet) 0 1,578 Device #1 Routing Primary Invert 590.35' #2 Device 1 598.00' #3 Device 1 601.10' #4 Device 1 601.40' Inc.Store (cubic-feet) 0 514 789 Cum.Store (cubic-feet) 0 514 1,303 Outlet Devices 12.0" Vert. SD-22 Outlet (Elevation F) C= 0.600 Limited to weir flow at low heads 2.5" Vert. Water Quatity (Elevation G) C= 0.600 Limited to weir flow at low heads 36.0" W x 2.5" H Vert. Water Quantity (Elevation H) C= 0.600 Limited to weir flow at low heads 48.0" x 48.0" Horiz. Overflow Grate (Elevation I) C= 0.600 Limited to weir flow at low heads

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 143 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.33 cfs @ 12.67 hrs HW=601.13' TW=588.86' (Dynamic Tailwater) 1=SD-22 Outlet (Elevation F) (Passes 0.33 cfs of 12.12 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.29 cfs @ 8.37 fps) 3=Water Quantity (Elevation H) (Orifice Controls 0.04 cfs @ 0.53 fps) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 2P: BR-02 Hydrograph Inflow Primary 1.14 cfs Inflow Area=0.350 ac Peak Elev=601.13' Storage=1,649 cf Flow (cfs) 1 0.33 cfs 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-1B) 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 2P: BR-02 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 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.09 0.16 0.46 0.50 0.20 0.13 0.09 0.08 0.06 0.05 0.05 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 Storage Elevation (cubic-feet) (feet) 0 598.00 0 598.00 0 598.00 2 598.00 7 598.01 14 598.02 20 598.03 26 598.04 31 598.05 35 598.05 38 598.06 41 598.06 44 598.07 48 598.08 54 598.08 60 598.09 67 598.10 74 598.11 82 598.13 92 598.14 107 598.17 128 598.20 164 598.25 253 598.39 516 598.81 1,590 601.09 1,585 601.09 1,366 600.76 1,107 600.01 887 599.42 695 599.10 525 598.82 388 598.60 283 598.44 208 598.32 156 598.24 123 598.19 104 598.16 95 598.15 90 598.14 88 598.13 85 598.13 84 598.13 82 598.13 80 598.12 78 598.12 76 598.12 74 598.11 72 598.11 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.09 0.14 0.28 0.28 0.27 0.23 0.19 0.16 0.14 0.12 0.09 0.08 0.06 0.05 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 Printed 5/13/2024 Page 144

Post-Developed (O-1B) 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 145 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth > 4.02" for 10-Year_Current event Inflow = 1.05 cfs @ 12.33 hrs, Volume= 0.130 af Outflow = 0.26 cfs @ 13.01 hrs, Volume= 0.127 af, Atten= 75%, Lag= 41.2 min Primary = 0.26 cfs @ 13.01 hrs, Volume= 0.127 af Routed to Pond 17P : SD-23 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 596.66' @ 13.01 hrs Surf.Area= 6,525 sf Storage= 2,048 cf Plug-Flow detention time= 99.0 min calculated for 0.127 af (98% of inflow) Center-of-Mass det. time= 87.1 min ( 890.4 - 803.4 ) Volume #1 #2 Invert 596.00' 595.50' Avail.Storage 8,864 cf 408 cf #3 594.00' 1,305 cf #4 594.00' 22 cf 10,599 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 1,088 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 3,263 cf Overall x 40.0% Voids 4.0" Round Pipe Storage L= 254.1' S= 0.0001 '/' Total Available Storage Elevation (feet) 596.00 597.50 601.25 Surf.Area Voids (sq-ft) (%) 2,175 0.0 2,175 21.7 2,175 100.0 Elevation (feet) 595.50 596.00 Surf.Area (sq-ft) 2,175 2,175 Inc.Store (cubic-feet) 0 1,088 Cum.Store (cubic-feet) 0 1,088 Elevation (feet) 594.00 595.50 Surf.Area (sq-ft) 2,175 2,175 Inc.Store (cubic-feet) 0 3,263 Cum.Store (cubic-feet) 0 3,263 Device #1 Routing Primary Invert 588.19' #2 Device 1 594.00' #3 Device 1 598.50' #4 Device 1 601.15' Inc.Store (cubic-feet) 0 708 8,156 Cum.Store (cubic-feet) 0 708 8,864 Outlet Devices 15.0" Vert. SD-23 Outlet (Elevation F) C= 0.600 Limited to weir flow at low heads 2.5" Vert. Water Quatity (Elevation G) C= 0.600 Limited to weir flow at low heads 2.5" W x 2.5" H Vert. Water Quantity (Elevation H) C= 0.600 Limited to weir flow at low heads 48.0" x 48.0" Horiz. Overflow Grate (Elevation I) C= 0.600 Limited to weir flow at low heads

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 146 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.26 cfs @ 13.01 hrs HW=596.66' TW=587.24' (Dynamic Tailwater) 1=SD-23 Outlet (Elevation F) (Passes 0.26 cfs of 16.55 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.26 cfs @ 7.70 fps) 3=Water Quantity (Elevation H) ( Controls 0.00 cfs) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 3P: BR-03 Hydrograph Inflow Primary 1.05 cfs Inflow Area=0.388 ac Peak Elev=596.66' Storage=2,048 cf Flow (cfs) 1 0.26 cfs 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-1B) 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 3P: BR-03 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 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.09 0.15 0.37 0.78 0.27 0.15 0.11 0.09 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 Storage Elevation (cubic-feet) (feet) 0 594.00 0 594.00 0 594.00 2 594.00 6 594.01 13 594.01 20 594.02 28 594.03 35 594.04 42 594.05 47 594.05 52 594.06 58 594.06 63 594.07 71 594.08 80 594.09 90 594.10 101 594.11 113 594.12 126 594.14 146 594.16 174 594.19 215 594.23 309 594.33 550 594.61 1,683 595.94 2,048 596.66 1,945 596.45 1,741 596.01 1,521 595.74 1,304 595.47 1,092 595.23 899 595.01 729 594.81 584 594.65 462 594.51 362 594.39 282 594.30 224 594.24 184 594.20 158 594.17 143 594.15 134 594.14 128 594.14 124 594.13 120 594.13 117 594.13 114 594.12 111 594.12 Primary (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 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.05 0.06 0.08 0.12 0.22 0.26 0.25 0.23 0.21 0.19 0.17 0.16 0.14 0.12 0.10 0.09 0.07 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 Printed 5/13/2024 Page 147

Post-Developed (O-1B) 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 148 Summary for Pond 5P: BR-05 Inflow Area = 0.241 ac, 27.64% Impervious, Inflow Depth > 4.02" for 10-Year_Current event Inflow = 1.04 cfs @ 12.14 hrs, Volume= 0.081 af Outflow = 0.21 cfs @ 12.55 hrs, Volume= 0.079 af, Atten= 80%, Lag= 24.6 min Primary = 0.21 cfs @ 12.55 hrs, Volume= 0.079 af Routed to Pond 13P : SD-25, SD-26 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 595.55' @ 12.55 hrs Surf.Area= 3,150 sf Storage= 1,100 cf Plug-Flow detention time= 65.1 min calculated for 0.079 af (98% of inflow) Center-of-Mass det. time= 54.8 min ( 845.9 - 791.0 ) Volume #1 #2 Invert 595.80' 595.30' Avail.Storage 4,371 cf 295 cf #3 593.80' 941 cf #4 593.80' 11 cf 5,618 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 788 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 2,363 cf Overall - 11 cf Embedded = 2,352 cf x 40.0% Voids 4.0" Round 4" Underdrain Pipe Inside #3 L= 125.2' S= 0.0001 '/' Total Available Storage Elevation (feet) 595.80 597.30 599.75 Surf.Area Voids (sq-ft) (%) 1,575 0.0 1,575 21.7 1,575 100.0 Elevation (feet) 595.30 595.80 Surf.Area (sq-ft) 1,575 1,575 Inc.Store (cubic-feet) 0 788 Cum.Store (cubic-feet) 0 788 Elevation (feet) 593.80 595.30 Surf.Area (sq-ft) 1,575 1,575 Inc.Store (cubic-feet) 0 2,363 Cum.Store (cubic-feet) 0 2,363 Device #1 Routing Primary Invert 584.63' #2 Device 1 593.80' #3 Device 1 598.20' #4 Device 1 599.65' Inc.Store (cubic-feet) 0 513 3,859 Cum.Store (cubic-feet) 0 513 4,371 Outlet Devices 18.0" Vert. SD-25 Outlet (Elevation F) C= 0.600 Limited to weir flow at low heads 2.5" Vert. Water Quatity (Elevation G) C= 0.600 Limited to weir flow at low heads 12.0" W x 2.5" H Vert. Water Quantity (Elevation H) C= 0.600 Limited to weir flow at low heads 48.0" x 48.0" Horiz. Overflow Grate (Elevation I) C= 0.600 Limited to weir flow at low heads

Post-Developed (O-1B) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 149 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.21 cfs @ 12.55 hrs HW=595.55' TW=580.96' (Dynamic Tailwater) 1=SD-25 Outlet (Elevation F) (Passes 0.21 cfs of 27.14 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.21 cfs @ 6.18 fps) 3=Water Quantity (Elevation H) ( Controls 0.00 cfs) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 5P: BR-05 Hydrograph Inflow Primary 1.04 cfs Inflow Area=0.241 ac Peak Elev=595.55' Storage=1,100 cf Flow (cfs) 1 0.21 cfs 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-1B) 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 5P: BR-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 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.04 0.07 0.12 0.54 0.22 0.12 0.08 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 Storage Elevation (cubic-feet) (feet) 0 593.80 0 593.80 0 593.80 2 593.80 5 593.81 10 593.82 14 593.82 18 593.83 22 593.83 25 593.84 28 593.84 31 593.85 34 593.85 37 593.86 41 593.86 47 593.87 52 593.88 58 593.89 64 593.90 73 593.91 85 593.93 99 593.95 126 593.99 191 594.09 453 594.51 1,099 595.55 1,006 595.39 832 595.11 645 594.81 483 594.56 347 594.34 240 594.17 168 594.06 124 593.99 100 593.95 89 593.94 81 593.93 76 593.92 73 593.91 71 593.91 69 593.91 68 593.91 66 593.90 65 593.90 64 593.90 62 593.90 61 593.89 59 593.89 58 593.89 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 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.05 0.07 0.13 0.21 0.20 0.18 0.16 0.13 0.11 0.08 0.06 0.05 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 Printed 5/13/2024 Page 150

Post-Developed (O-1B) 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 151 Summary for Pond 6P: BR-04 Inflow Area = 0.317 ac, 38.48% Impervious, Inflow Depth > 4.12" for 10-Year_Current event Inflow = 1.44 cfs @ 12.12 hrs, Volume= 0.109 af Outflow = 0.20 cfs @ 12.71 hrs, Volume= 0.106 af, Atten= 86%, Lag= 35.1 min Primary = 0.20 cfs @ 12.71 hrs, Volume= 0.106 af Routed to Pond 14P : SD-24 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 596.26' @ 12.71 hrs Surf.Area= 5,788 sf Storage= 1,813 cf Plug-Flow detention time= 115.9 min calculated for 0.106 af (97% of inflow) Center-of-Mass det. time= 99.3 min ( 882.6 - 783.3 ) Volume #1 #2 Invert 596.70' 596.20' Avail.Storage 5,428 cf 543 cf #3 594.70' 1,727 cf #4 594.70' 24 cf 7,721 cf Storage Description Filter Media Layer (Prismatic)Listed below (Recalc) Sand Layer (Prismatic)Listed below (Recalc) 1,447 cf Overall x 37.5% Voids Gravel Layer (Prismatic)Listed below (Recalc) 4,341 cf Overall - 24 cf Embedded = 4,317 cf x 40.0% Voids 4.0" Round 4" Underdrain Pipe Inside #3 L= 271.7' S= 0.0001 '/' Total Available Storage Elevation (feet) 596.70 598.20 599.75 Surf.Area Voids (sq-ft) (%) 2,894 0.0 2,894 21.7 2,894 100.0 Elevation (feet) 596.20 596.70 Surf.Area (sq-ft) 2,894 2,894 Inc.Store (cubic-feet) 0 1,447 Cum.Store (cubic-feet) 0 1,447 Elevation (feet) 594.70 596.20 Surf.Area (sq-ft) 2,894 2,894 Inc.Store (cubic-feet) 0 4,341 Cum.Store (cubic-feet) 0 4,341 Device #1 Routing Primary Invert 586.53' #2 Device 1 594.70' #3 Device 1 598.30' #4 Device 1 599.65' Inc.Store (cubic-feet) 0 942 4,486 Cum.Store (cubic-feet) 0 942 5,428 Outlet Devices 15.0" Vert. SD-24 Outlet (Elevation F) C= 0.600 Limited to weir flow at low heads 2.5" Vert. Water Quatity (Elevation G) C= 0.600 Limited to weir flow at low heads 2.5" W x 2.5" H Vert. Water Quantity (Elevation H) C= 0.600 Limited to weir flow at low heads 48.0" x 48.0" Horiz. Overflow Grate (Elevation I) C= 0.600 Limited to weir flow at low heads