J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 222 Summary for Pond 2P: BR-02 Inflow Area = 0.350 ac, 31.71% Impervious, Inflow Depth > 7.80" for 100-Year_Current event Inflow = 2.14 cfs @ 12.23 hrs, Volume= 0.228 af Outflow = 1.85 cfs @ 12.31 hrs, Volume= 0.225 af, Atten= 14%, Lag= 5.0 min Primary = 1.85 cfs @ 12.31 hrs, Volume= 0.225 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= 601.42' @ 12.31 hrs Surf.Area= 4,734 sf Storage= 2,112 cf Plug-Flow detention time= 55.0 min calculated for 0.225 af (99% of inflow) Center-of-Mass det. time= 48.3 min ( 829.1 - 780.7 ) 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_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 223 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=1.85 cfs @ 12.31 hrs HW=601.42' TW=589.40' (Dynamic Tailwater) 1=SD-22 Outlet (Elevation F) (Passes 1.85 cfs of 12.30 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.30 cfs @ 8.77 fps) 3=Water Quantity (Elevation H) (Orifice Controls 1.39 cfs @ 2.22 fps) 4=Overflow Grate (Elevation I) (Weir Controls 0.16 cfs @ 0.47 fps) Pond 2P: BR-02 Hydrograph Inflow Primary 2.14 cfs Inflow Area=0.350 ac Peak Elev=601.42' Storage=2,112 cf Flow (cfs) 2 1.85 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-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", 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 0.01 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 0.09 0.11 0.13 0.19 0.32 0.88 0.93 0.36 0.23 0.16 0.14 0.11 0.09 0.09 0.08 0.07 0.07 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 Storage Elevation (cubic-feet) (feet) 0 598.00 0 598.00 3 598.00 12 598.02 23 598.04 34 598.05 42 598.07 48 598.07 55 598.08 61 598.09 68 598.10 74 598.11 80 598.12 87 598.13 96 598.15 107 598.17 120 598.18 134 598.21 151 598.23 176 598.27 220 598.34 281 598.43 379 598.59 596 598.93 1,170 600.19 1,947 601.32 1,697 601.16 1,603 601.10 1,432 600.95 1,229 600.36 1,039 599.81 865 599.38 713 599.13 583 598.91 472 598.74 378 598.59 301 598.47 239 598.37 195 598.30 167 598.26 149 598.23 137 598.21 128 598.20 122 598.19 117 598.18 113 598.17 109 598.17 106 598.16 102 598.16 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 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 0.09 0.11 0.15 0.24 1.26 0.42 0.28 0.28 0.25 0.21 0.19 0.17 0.15 0.13 0.11 0.10 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 Printed 5/13/2024 Page 224

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 225 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth > 7.72" for 100-Year_Current event Inflow = 1.97 cfs @ 12.32 hrs, Volume= 0.250 af Outflow = 0.34 cfs @ 13.29 hrs, Volume= 0.246 af, Atten= 83%, Lag= 58.1 min Primary = 0.34 cfs @ 13.29 hrs, Volume= 0.246 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= 598.43' @ 13.29 hrs Surf.Area= 6,525 sf Storage= 4,464 cf Plug-Flow detention time= 138.7 min calculated for 0.246 af (98% of inflow) Center-of-Mass det. time= 128.2 min ( 916.9 - 788.7 ) 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_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 226 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.34 cfs @ 13.29 hrs HW=598.43' TW=587.39' (Dynamic Tailwater) 1=SD-23 Outlet (Elevation F) (Passes 0.34 cfs of 18.32 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.34 cfs @ 10.01 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 1.97 cfs Inflow Area=0.388 ac Peak Elev=598.43' Storage=4,464 cf Flow (cfs) 2 1 0.34 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_Current Rainfall=9.23", 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 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.06 0.06 0.07 0.09 0.11 0.14 0.19 0.31 0.72 1.45 0.49 0.28 0.19 0.16 0.13 0.11 0.10 0.09 0.08 0.08 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 Storage Elevation (cubic-feet) (feet) 0 594.00 0 594.00 2 594.00 9 594.01 22 594.02 35 594.04 47 594.05 58 594.06 68 594.08 79 594.09 90 594.10 100 594.11 111 594.12 121 594.13 134 594.14 150 594.16 168 594.18 189 594.20 214 594.23 245 594.26 298 594.32 375 594.41 487 594.53 713 594.79 1,248 595.41 3,490 597.98 4,393 598.40 4,439 598.42 4,238 598.33 3,948 598.19 3,616 598.04 3,248 597.87 2,868 597.70 2,486 597.52 2,124 596.82 1,812 596.16 1,542 595.76 1,295 595.46 1,076 595.21 886 594.99 725 594.81 590 594.65 479 594.53 391 594.42 322 594.35 271 594.29 232 594.25 204 594.22 182 594.20 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 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 0.14 0.19 0.32 0.34 0.34 0.34 0.33 0.33 0.32 0.31 0.30 0.27 0.24 0.21 0.19 0.17 0.15 0.14 0.12 0.11 0.09 0.08 0.07 0.06 0.06 0.05 Printed 5/13/2024 Page 227

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 228 Summary for Pond 5P: BR-05 Inflow Area = 0.241 ac, 27.64% Impervious, Inflow Depth > 7.73" for 100-Year_Current event Inflow = 1.96 cfs @ 12.13 hrs, Volume= 0.155 af Outflow = 0.32 cfs @ 12.62 hrs, Volume= 0.154 af, Atten= 84%, Lag= 29.0 min Primary = 0.32 cfs @ 12.62 hrs, Volume= 0.154 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= 597.66' @ 12.62 hrs Surf.Area= 4,725 sf Storage= 2,328 cf Plug-Flow detention time= 79.7 min calculated for 0.153 af (99% of inflow) Center-of-Mass det. time= 72.1 min ( 848.2 - 776.1 ) 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_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 229 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.32 cfs @ 12.62 hrs HW=597.66' TW=581.32' (Dynamic Tailwater) 1=SD-25 Outlet (Elevation F) (Passes 0.32 cfs of 29.82 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.32 cfs @ 9.33 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 1.96 cfs Inflow Area=0.241 ac Peak Elev=597.66' Storage=2,328 cf Flow (cfs) 2 1 0.32 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_Current Rainfall=9.23", 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 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.06 0.08 0.09 0.15 0.25 1.04 0.40 0.21 0.14 0.11 0.09 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.02 Storage Elevation (cubic-feet) (feet) 0 593.80 0 593.80 3 593.80 9 593.81 17 593.83 24 593.84 30 593.85 35 593.86 41 593.86 47 593.87 52 593.88 57 593.89 62 593.90 68 593.91 76 593.92 84 593.93 93 593.94 102 593.96 111 593.97 127 594.00 154 594.04 191 594.09 263 594.21 426 594.47 992 595.37 2,306 597.65 2,245 597.61 1,988 597.45 1,654 596.99 1,352 596.11 1,093 595.54 860 595.15 662 594.84 500 594.58 370 594.38 270 594.22 198 594.10 149 594.03 121 593.99 107 593.97 100 593.95 97 593.95 94 593.94 91 593.94 89 593.94 87 593.93 85 593.93 82 593.93 80 593.92 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.06 0.07 0.09 0.12 0.20 0.32 0.32 0.31 0.29 0.24 0.21 0.18 0.16 0.14 0.11 0.09 0.07 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Printed 5/13/2024 Page 230

Post-Developed (O-1B) West Orange HydroCAD_Post NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 231 Summary for Pond 6P: BR-04 Inflow Area = 0.317 ac, 38.48% Impervious, Inflow Depth > 7.84" for 100-Year_Current event Inflow = 2.68 cfs @ 12.12 hrs, Volume= 0.207 af Outflow = 0.32 cfs @ 12.85 hrs, Volume= 0.203 af, Atten= 88%, Lag= 43.8 min Primary = 0.32 cfs @ 12.85 hrs, Volume= 0.203 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= 598.36' @ 12.85 hrs Surf.Area= 8,682 sf Storage= 3,691 cf Plug-Flow detention time= 142.5 min calculated for 0.203 af (98% of inflow) Center-of-Mass det. time= 128.8 min ( 899.1 - 770.3 ) 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