J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 102 Summary for Pond 2P: BR-02 Inflow Area = 0.350 ac, 31.71% Impervious, Inflow Depth > 2.87" for 2-Year_Future event Inflow = 0.84 cfs @ 12.22 hrs, Volume= 0.084 af Outflow = 0.23 cfs @ 12.66 hrs, Volume= 0.082 af, Atten= 73%, Lag= 26.7 min Primary = 0.23 cfs @ 12.66 hrs, Volume= 0.082 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= 600.04' @ 12.66 hrs Surf.Area= 4,734 sf Storage= 1,120 cf Plug-Flow detention time= 64.4 min calculated for 0.082 af (98% of inflow) Center-of-Mass det. time= 54.2 min ( 855.8 - 801.6 ) 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 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 103 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.23 cfs @ 12.66 hrs HW=600.04' TW=588.81' (Dynamic Tailwater) 1=SD-22 Outlet (Elevation F) (Passes 0.23 cfs of 11.47 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.23 cfs @ 6.70 fps) 3=Water Quantity (Elevation H) ( Controls 0.00 cfs) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 2P: BR-02 Hydrograph Inflow Primary 0.84 cfs 0.9 Inflow Area=0.350 ac Peak Elev=600.04' Storage=1,120 cf 0.85 0.8 0.75 0.7 0.65 Flow (cfs) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.23 cfs 0.25 0.2 0.15 0.1 0.05 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 2-Year_Future Rainfall=4.07", 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.06 0.11 0.33 0.34 0.14 0.09 0.07 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 0.02 0.01 Storage Elevation (cubic-feet) (feet) 0 598.00 0 598.00 0 598.00 1 598.00 3 598.01 7 598.01 12 598.02 17 598.03 22 598.03 26 598.04 29 598.05 32 598.05 34 598.05 36 598.06 40 598.06 44 598.07 49 598.08 55 598.09 61 598.09 69 598.11 80 598.12 94 598.15 117 598.18 171 598.26 347 598.54 1,091 599.96 1,059 599.86 894 599.43 709 599.12 541 598.85 398 598.62 282 598.44 198 598.30 144 598.22 112 598.17 96 598.15 87 598.13 80 598.12 77 598.12 74 598.11 73 598.11 71 598.11 70 598.11 68 598.11 67 598.10 65 598.10 64 598.10 62 598.10 61 598.09 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 0.03 0.04 0.07 0.11 0.22 0.22 0.19 0.17 0.14 0.12 0.09 0.07 0.06 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 Printed 5/13/2024 Page 104

Post-Developed (O-1B) NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 105 Summary for Pond 3P: BR-03 Inflow Area = 0.388 ac, 28.87% Impervious, Inflow Depth > 2.82" for 2-Year_Future event Inflow = 0.77 cfs @ 12.30 hrs, Volume= 0.091 af Outflow = 0.20 cfs @ 12.94 hrs, Volume= 0.089 af, Atten= 74%, Lag= 38.4 min Primary = 0.20 cfs @ 12.94 hrs, Volume= 0.089 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= 595.56' @ 12.94 hrs Surf.Area= 4,350 sf Storage= 1,373 cf Plug-Flow detention time= 89.2 min calculated for 0.089 af (98% of inflow) Center-of-Mass det. time= 75.3 min ( 885.0 - 809.8 ) 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 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 106 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.20 cfs @ 12.94 hrs HW=595.56' TW=587.20' (Dynamic Tailwater) 1=SD-23 Outlet (Elevation F) (Passes 0.20 cfs of 15.34 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.20 cfs @ 5.80 fps) 3=Water Quantity (Elevation H) ( Controls 0.00 cfs) 4=Overflow Grate (Elevation I) ( Controls 0.00 cfs) Pond 3P: BR-03 Hydrograph 0.85 Inflow Primary 0.77 cfs Inflow Area=0.388 ac Peak Elev=595.56' Storage=1,373 cf 0.8 0.75 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.20 cfs 0.2 0.15 0.1 0.05 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 2-Year_Future Rainfall=4.07", 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 0.00 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 0.04 0.06 0.11 0.27 0.52 0.18 0.11 0.08 0.06 0.05 0.04 0.04 0.04 0.03 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 Storage Elevation (cubic-feet) (feet) 0 594.00 0 594.00 0 594.00 0 594.00 3 594.00 7 594.01 12 594.01 17 594.02 23 594.03 29 594.03 34 594.04 39 594.04 43 594.05 47 594.05 51 594.06 58 594.06 65 594.07 73 594.08 82 594.09 92 594.10 107 594.12 127 594.14 154 594.17 213 594.23 375 594.41 1,175 595.32 1,372 595.55 1,273 595.44 1,105 595.24 928 595.04 762 594.85 608 594.67 476 594.52 370 594.40 287 594.31 225 594.24 179 594.19 148 594.16 131 594.14 121 594.13 115 594.12 110 594.12 107 594.12 104 594.11 102 594.11 100 594.11 97 594.11 95 594.10 92 594.10 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 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.06 0.09 0.18 0.20 0.19 0.18 0.16 0.14 0.12 0.11 0.09 0.07 0.06 0.05 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Printed 5/13/2024 Page 107

Post-Developed (O-1B) NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 108 Summary for Pond 5P: BR-05 Inflow Area = 0.241 ac, 27.64% Impervious, Inflow Depth > 2.81" for 2-Year_Future event Inflow = 0.75 cfs @ 12.13 hrs, Volume= 0.056 af Outflow = 0.17 cfs @ 12.44 hrs, Volume= 0.055 af, Atten= 78%, Lag= 18.6 min Primary = 0.17 cfs @ 12.44 hrs, Volume= 0.055 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= 594.95' @ 12.44 hrs Surf.Area= 1,575 sf Storage= 729 cf Plug-Flow detention time= 60.5 min calculated for 0.055 af (98% of inflow) Center-of-Mass det. time= 48.2 min ( 846.9 - 798.7 ) 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 2-Year_Future Rainfall=4.07", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 109 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.17 cfs @ 12.44 hrs HW=594.95' TW=580.89' (Dynamic Tailwater) 1=SD-25 Outlet (Elevation F) (Passes 0.17 cfs of 26.32 cfs potential flow) 2=Water Quatity (Elevation G) (Orifice Controls 0.17 cfs @ 4.92 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 0.75 cfs 0.8 Inflow Area=0.241 ac Peak Elev=594.95' Storage=729 cf 0.75 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.17 cfs 0.15 0.1 0.05 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 2-Year_Future Rainfall=4.07", 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 0.00 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 0.02 0.02 0.03 0.05 0.08 0.39 0.16 0.08 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Storage Elevation (cubic-feet) (feet) 0 593.80 0 593.80 0 593.80 1 593.80 3 593.80 5 593.81 8 593.81 12 593.82 15 593.82 18 593.83 21 593.83 23 593.84 25 593.84 27 593.84 30 593.85 34 593.85 38 593.86 42 593.87 47 593.87 54 593.88 63 593.90 74 593.91 93 593.94 134 594.01 308 594.28 728 594.95 635 594.80 495 594.58 359 594.36 251 594.19 172 594.06 120 593.99 94 593.95 83 593.93 76 593.92 71 593.91 67 593.90 63 593.90 61 593.89 60 593.89 58 593.89 57 593.89 56 593.89 55 593.89 54 593.88 53 593.88 51 593.88 50 593.88 49 593.88 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 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.05 0.10 0.17 0.16 0.13 0.11 0.09 0.07 0.05 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Printed 5/13/2024 Page 110

Post-Developed (O-1B) NOAA 24-hr D 2-Year_Future Rainfall=4.07", 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 111 Summary for Pond 6P: BR-04 Inflow Area = 0.317 ac, 38.48% Impervious, Inflow Depth > 2.91" for 2-Year_Future event Inflow = 1.05 cfs @ 12.12 hrs, Volume= 0.077 af Outflow = 0.16 cfs @ 12.61 hrs, Volume= 0.074 af, Atten= 85%, Lag= 29.2 min Primary = 0.16 cfs @ 12.61 hrs, Volume= 0.074 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= 595.75' @ 12.61 hrs Surf.Area= 2,894 sf Storage= 1,229 cf Plug-Flow detention time= 105.6 min calculated for 0.074 af (97% of inflow) Center-of-Mass det. time= 86.2 min ( 876.0 - 789.8 ) 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