J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) 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 262 Summary for Pond 2P: BR-02 Inflow Area = 0.350 ac, 31.71% Impervious, Inflow Depth > 10.10" for 100-Year_Future event Inflow = 2.83 cfs @ 12.21 hrs, Volume= 0.295 af Outflow = 2.78 cfs @ 12.24 hrs, Volume= 0.292 af, Atten= 2%, Lag= 1.6 min Primary = 2.78 cfs @ 12.24 hrs, Volume= 0.292 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= 601.47' @ 12.24 hrs Surf.Area= 4,734 sf Storage= 2,187 cf Plug-Flow detention time= 50.9 min calculated for 0.292 af (99% of inflow) Center-of-Mass det. time= 44.7 min ( 819.0 - 774.3 ) 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 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 263 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=2.78 cfs @ 12.24 hrs HW=601.47' TW=589.99' (Dynamic Tailwater) 1=SD-22 Outlet (Elevation F) (Passes 2.78 cfs of 12.32 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.30 cfs @ 8.83 fps) 3=Water Quantity (Elevation H) (Orifice Controls 1.54 cfs @ 2.46 fps) 4=Overflow Grate (Elevation I) (Weir Controls 0.94 cfs @ 0.86 fps) Pond 2P: BR-02 Hydrograph Inflow Primary 2.83 cfs 3 Inflow Area=0.350 ac Peak Elev=601.47' Storage=2,187 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-1B) 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 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 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.06 0.07 0.07 0.08 0.09 0.12 0.15 0.18 0.26 0.43 1.20 1.10 0.45 0.28 0.20 0.17 0.14 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.04 Storage Elevation (cubic-feet) (feet) 0 598.00 0 598.00 6 598.01 19 598.03 33 598.05 45 598.07 54 598.08 63 598.10 71 598.11 80 598.12 88 598.14 95 598.15 103 598.16 111 598.17 124 598.19 141 598.22 162 598.25 186 598.29 214 598.33 253 598.39 319 598.49 412 598.64 558 598.87 869 599.39 1,656 601.13 2,007 601.35 1,732 601.18 1,645 601.13 1,541 601.06 1,379 600.80 1,200 600.28 1,023 599.76 875 599.40 745 599.18 629 598.99 525 598.82 432 598.67 351 598.55 290 598.45 245 598.38 213 598.33 191 598.29 174 598.27 162 598.25 152 598.23 143 598.22 136 598.21 129 598.20 123 598.19 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.14 0.19 0.34 1.44 0.51 0.32 0.28 0.27 0.24 0.21 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.05 Printed 5/13/2024 Page 264

Post-Developed (O-1B) 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 265 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth > 10.02" for 100-Year_Future event Inflow = 2.63 cfs @ 12.30 hrs, Volume= 0.324 af Outflow = 0.50 cfs @ 13.12 hrs, Volume= 0.317 af, Atten= 81%, Lag= 49.4 min Primary = 0.50 cfs @ 13.12 hrs, Volume= 0.317 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= 599.05' @ 13.12 hrs Surf.Area= 6,525 sf Storage= 5,822 cf Plug-Flow detention time= 150.2 min calculated for 0.317 af (98% of inflow) Center-of-Mass det. time= 137.0 min ( 918.6 - 781.6 ) 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 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 266 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.50 cfs @ 13.12 hrs HW=599.05' TW=587.56' (Dynamic Tailwater) 1=SD-23 Outlet (Elevation F) (Passes 0.50 cfs of 18.91 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.37 cfs @ 10.71 fps) 3=Water Quantity (Elevation H) (Orifice Controls 0.14 cfs @ 3.22 fps) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 3P: BR-03 Hydrograph Inflow Primary 2.63 cfs Inflow Area=0.388 ac Peak Elev=599.05' Storage=5,822 cf Flow (cfs) 2 1 0.50 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 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 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 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.15 0.19 0.26 0.42 0.99 1.74 0.59 0.34 0.24 0.20 0.16 0.14 0.12 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 Storage Elevation (cubic-feet) (feet) 0 594.00 0 594.00 4 594.00 17 594.02 33 594.04 49 594.05 63 594.07 78 594.09 92 594.10 106 594.12 120 594.13 132 594.14 145 594.16 157 594.17 175 594.19 198 594.21 227 594.24 262 594.28 302 594.32 352 594.38 432 594.47 546 594.60 711 594.79 1,040 595.17 1,802 596.14 4,861 598.61 5,804 599.05 5,704 599.00 5,353 598.84 4,972 598.66 4,639 598.51 4,291 598.35 3,922 598.18 3,548 598.01 3,169 597.83 2,786 597.66 2,399 597.41 2,041 596.65 1,739 596.01 1,482 595.69 1,255 595.42 1,056 595.19 882 594.99 734 594.82 608 594.67 504 594.55 419 594.46 351 594.38 298 594.32 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.14 0.17 0.23 0.37 0.50 0.49 0.46 0.39 0.35 0.34 0.33 0.32 0.32 0.31 0.30 0.26 0.23 0.21 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.09 0.08 Printed 5/13/2024 Page 267

Post-Developed (O-1B) 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 268 Summary for Pond 5P: BR-05 Inflow Area = 0.241 ac, 27.64% Impervious, Inflow Depth > 10.03" for 100-Year_Future event Inflow = 2.55 cfs @ 12.13 hrs, Volume= 0.202 af Outflow = 0.35 cfs @ 12.72 hrs, Volume= 0.200 af, Atten= 86%, Lag= 35.4 min Primary = 0.35 cfs @ 12.72 hrs, Volume= 0.200 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= 598.22' @ 12.72 hrs Surf.Area= 4,725 sf Storage= 3,203 cf Plug-Flow detention time= 94.7 min calculated for 0.200 af (99% of inflow) Center-of-Mass det. time= 87.9 min ( 857.7 - 769.9 ) 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 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 269 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.35 cfs @ 12.72 hrs HW=598.22' TW=581.43' (Dynamic Tailwater) 1=SD-25 Outlet (Elevation F) (Passes 0.35 cfs of 30.49 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.34 cfs @ 10.00 fps) 3=Water Quantity (Elevation H) (Orifice Controls 0.01 cfs @ 0.41 fps) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 5P: BR-05 Hydrograph Inflow Primary 2.55 cfs Inflow Area=0.241 ac Peak Elev=598.22' Storage=3,203 cf Flow (cfs) 2 1 0.35 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 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 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 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.11 0.13 0.20 0.33 1.39 0.51 0.27 0.17 0.13 0.11 0.09 0.08 0.07 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 Storage Elevation (cubic-feet) (feet) 0 593.80 0 593.80 5 593.81 14 593.82 24 593.84 32 593.85 39 593.86 47 593.87 54 593.88 61 593.90 68 593.91 74 593.91 79 593.92 86 593.93 95 593.95 106 593.96 117 593.98 130 594.00 145 594.02 170 594.06 212 594.13 269 594.22 374 594.38 606 594.75 1,390 596.22 3,144 598.18 3,167 598.19 2,946 598.05 2,618 597.84 2,262 597.62 1,886 597.38 1,513 596.58 1,214 595.74 966 595.32 755 594.99 576 594.70 428 594.47 313 594.29 232 594.16 178 594.07 145 594.02 126 593.99 115 593.98 108 593.97 104 593.96 101 593.96 98 593.95 95 593.95 92 593.94 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.11 0.15 0.25 0.34 0.34 0.33 0.33 0.32 0.31 0.27 0.22 0.20 0.17 0.15 0.12 0.10 0.08 0.07 0.06 0.05 0.04 0.04 0.04 0.04 0.04 0.03 0.03 Printed 5/13/2024 Page 270

Post-Developed (O-1B) 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 271 Summary for Pond 6P: BR-04 Inflow Area = 0.317 ac, 38.48% Impervious, Inflow Depth > 10.15" for 100-Year_Future event Inflow = 3.49 cfs @ 12.12 hrs, Volume= 0.268 af Outflow = 0.44 cfs @ 12.74 hrs, Volume= 0.261 af, Atten= 87%, Lag= 37.2 min Primary = 0.44 cfs @ 12.74 hrs, Volume= 0.261 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= 598.73' @ 12.74 hrs Surf.Area= 8,682 sf Storage= 4,782 cf Plug-Flow detention time= 148.4 min calculated for 0.261 af (98% of inflow) Center-of-Mass det. time= 132.9 min ( 897.7 - 764.8 ) 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