J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 74 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 18P: SD-22 Inflow Area = 0.917 ac, 22.90% Impervious, Inflow Depth > 4.92" for 25-Year event Inflow = 1.10 cfs @ 12.44 hrs, Volume= 0.376 af Outflow = 1.10 cfs @ 12.44 hrs, Volume= 0.376 af, Atten= 0%, Lag= 0.1 min Primary = 1.10 cfs @ 12.44 hrs, Volume= 0.376 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= 588.99' @ 12.44 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.376 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 883.4 - 883.4 ) Volume #1 Device #1 Invert 588.45' Avail.Storage 0.002 af Routing Primary Invert 588.45' Storage Description 12.0" Round SD-22 L= 127.3' S= 0.0150 '/' Outlet Devices 12.0" Vert. SD-22 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.10 cfs @ 12.44 hrs HW=588.99' TW=587.36' (Dynamic Tailwater) 1=SD-22 (Orifice Controls 1.10 cfs @ 2.51 fps) Pond 18P: SD-22 Hydrograph Inflow Primary 1.10 cfs Inflow Area=0.917 ac Peak Elev=588.99' Storage=0.000 af 1.10 cfs Flow (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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 18P: SD-22 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 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.18 0.24 0.36 1.06 0.75 0.63 0.58 0.54 0.50 0.47 0.44 0.39 0.33 0.28 0.25 0.21 0.18 0.16 0.14 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 Storage Elevation (acre-feet) (feet) 0.000 588.45 0.000 588.45 0.000 588.45 0.000 588.46 0.000 588.46 0.000 588.48 0.000 588.49 0.000 588.49 0.000 588.50 0.000 588.51 0.000 588.51 0.000 588.52 0.000 588.53 0.000 588.53 0.000 588.54 0.000 588.56 0.000 588.57 0.000 588.58 0.000 588.59 0.000 588.60 0.000 588.62 0.000 588.63 0.000 588.66 0.000 588.69 0.000 588.75 0.000 588.98 0.000 588.89 0.000 588.85 0.000 588.83 0.000 588.82 0.000 588.80 0.000 588.79 0.000 588.78 0.000 588.76 0.000 588.73 0.000 588.71 0.000 588.69 0.000 588.68 0.000 588.66 0.000 588.64 0.000 588.63 0.000 588.62 0.000 588.61 0.000 588.60 0.000 588.59 0.000 588.59 0.000 588.58 0.000 588.58 0.000 588.57 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 0.03 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.18 0.24 0.36 1.06 0.75 0.63 0.58 0.54 0.50 0.47 0.44 0.39 0.33 0.28 0.25 0.21 0.18 0.16 0.14 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 Printed 5/13/2024 Page 75

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 76 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 19P: SD-21 Inflow Area = 0.567 ac, 17.46% Impervious, Inflow Depth > 4.85" for 25-Year event Inflow = 0.45 cfs @ 12.95 hrs, Volume= 0.229 af Outflow = 0.45 cfs @ 12.95 hrs, Volume= 0.229 af, Atten= 0%, Lag= 0.1 min Primary = 0.45 cfs @ 12.95 hrs, Volume= 0.229 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= 590.94' @ 12.95 hrs Surf.Area= 0.000 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.229 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 907.4 - 907.4 ) Volume #1 Device #1 Invert 590.61' Avail.Storage 0.001 af Routing Primary Invert 590.61' Storage Description 12.0" Round SD-21 L= 64.5' S= 0.0150 '/' Outlet Devices 12.0" Vert. SD-21 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.45 cfs @ 12.95 hrs HW=590.94' TW=588.90' (Dynamic Tailwater) 1=SD-21 (Orifice Controls 0.45 cfs @ 1.96 fps) Pond 19P: SD-21 Flow (cfs) Hydrograph 0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Primary 0.45 cfs Inflow Area=0.567 ac Peak Elev=590.94' Storage=0.000 af 0.45 cfs 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 19P: SD-21 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 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.14 0.20 0.34 0.44 0.35 0.34 0.33 0.32 0.32 0.31 0.28 0.23 0.21 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.05 0.04 Storage Elevation (acre-feet) (feet) 0.000 590.61 0.000 590.61 0.000 590.61 0.000 590.61 0.000 590.62 0.000 590.63 0.000 590.63 0.000 590.64 0.000 590.64 0.000 590.65 0.000 590.65 0.000 590.66 0.000 590.66 0.000 590.67 0.000 590.68 0.000 590.69 0.000 590.70 0.000 590.71 0.000 590.71 0.000 590.72 0.000 590.73 0.000 590.75 0.000 590.76 0.000 590.79 0.000 590.83 0.000 590.90 0.000 590.94 0.000 590.90 0.000 590.90 0.000 590.89 0.000 590.89 0.000 590.89 0.000 590.88 0.000 590.87 0.000 590.85 0.000 590.83 0.000 590.82 0.000 590.81 0.000 590.79 0.000 590.78 0.000 590.77 0.000 590.75 0.000 590.74 0.000 590.73 0.000 590.73 0.000 590.72 0.000 590.72 0.000 590.71 0.000 590.71 Primary (cfs) 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 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.14 0.20 0.34 0.45 0.35 0.34 0.33 0.32 0.32 0.31 0.28 0.23 0.21 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.05 0.04 Printed 5/13/2024 Page 77

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" 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 78 Summary for Pond 20P: SD-11, SD-12 Inflow Area = 1.308 ac, 0.00% Impervious, Inflow Depth > 3.55" for 25-Year event Inflow = 4.33 cfs @ 12.18 hrs, Volume= 0.387 af Outflow = 4.32 cfs @ 12.19 hrs, Volume= 0.386 af, Atten= 0%, Lag= 0.3 min Primary = 4.32 cfs @ 12.19 hrs, Volume= 0.386 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= 592.01' @ 12.19 hrs Surf.Area= 139 sf Storage= 79 cf Plug-Flow detention time= 0.8 min calculated for 0.386 af (100% of inflow) Center-of-Mass det. time= 0.4 min ( 839.9 - 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=4.32 cfs @ 12.19 hrs HW=592.01' TW=0.00' (Dynamic Tailwater) 1=SD-12 (Orifice Controls 4.32 cfs @ 3.42 fps)

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 79 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 20P: SD-11, SD-12 Hydrograph Inflow Primary 4.33 cfs Inflow Area=1.308 ac Peak Elev=592.01' Storage=79 cf 4.32 cfs 4 Flow (cfs) 3 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 20P: SD-11, SD-12 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 0.06 0.09 0.13 0.24 0.46 1.81 1.51 0.71 0.46 0.34 0.29 0.24 0.21 0.19 0.18 0.16 0.15 0.13 0.12 0.12 0.12 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 0.08 Storage Elevation (cubic-feet) (feet) 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.27 0 590.28 1 590.32 1 590.37 4 590.54 10 591.04 10 591.05 10 591.06 11 591.11 12 591.13 12 591.16 14 591.21 16 591.30 34 591.61 31 591.56 20 591.37 16 591.30 15 591.26 14 591.24 14 591.21 13 591.20 13 591.19 13 591.18 13 591.17 12 591.17 12 591.16 12 591.15 12 591.15 12 591.15 12 591.14 12 591.14 12 591.14 12 591.14 12 591.13 12 591.13 12 591.13 12 591.12 12 591.12 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 0.02 0.06 0.09 0.13 0.23 0.46 1.77 1.52 0.71 0.46 0.34 0.29 0.24 0.21 0.19 0.18 0.16 0.15 0.13 0.12 0.12 0.12 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 0.08 Printed 5/13/2024 Page 80

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" 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 81 Summary for Pond 23P: SD-01, SD-02 Inflow Area = 0.656 ac, 0.00% Impervious, Inflow Depth > 3.52" for 25-Year event Inflow = 2.09 cfs @ 12.22 hrs, Volume= 0.192 af Outflow = 2.09 cfs @ 12.22 hrs, Volume= 0.190 af, Atten= 0%, Lag= 0.1 min Primary = 2.09 cfs @ 12.22 hrs, Volume= 0.190 af Routed to Pond 12P : SD-03, SD-04, SD-05 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 597.85' @ 12.22 hrs Surf.Area= 17 sf Storage= 96 cf Plug-Flow detention time= 9.3 min calculated for 0.190 af (99% of inflow) Center-of-Mass det. time= 3.4 min ( 843.4 - 840.0 ) Volume #1 #2 #3 Invert 602.00' 591.82' 598.38' Avail.Storage 5,354,109 cf 163 cf 25 cf #4 #5 598.06' 597.81' 118 cf 61 cf 5,354,476 cf Elevation (feet) 602.00 603.00 Surf.Area (sq-ft) 696,960 12,422,876 Elevation (feet) 591.82 602.00 Surf.Area (sq-ft) 16 16 Inc.Store (cubic-feet) 0 163 Cum.Store (cubic-feet) 0 163 Elevation (feet) 598.06 607.15 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 118 Cum.Store (cubic-feet) 0 118 Device #1 Routing Primary Perim. (feet) 16.0 130.1 Storage Description Drainage Ditch Storage (Irregular)Listed below (Recalc) CB-1 (Prismatic) Listed below (Recalc) 12.0" Round SD-01 L= 31.6' S= 0.0100 '/' MH-01 (Prismatic) Listed below (Recalc) 12.0" Round SD-02 L= 78.0' S= 0.0100 '/' Total Available Storage Invert 597.04' Inc.Store (cubic-feet) 0 5,354,109 Cum.Store (cubic-feet) 0 5,354,109 Wet.Area (sq-ft) 696,960 698,289 Outlet Devices 12.0" Vert. SD-02 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.08 cfs @ 12.22 hrs HW=597.85' TW=596.70' (Dynamic Tailwater) 1=SD-02 (Orifice Controls 2.08 cfs @ 3.06 fps)

Post-Developed (25-Year) NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" West Orange HydroCAD_Post Printed 5/13/2024 Page 82 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 23P: SD-01, SD-02 Hydrograph Inflow Primary 2.09 cfs Inflow Area=0.656 ac Peak Elev=597.85' Storage=96 cf 2.09 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 (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 23P: SD-01, SD-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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.04 0.06 0.11 0.22 0.79 0.81 0.36 0.23 0.17 0.15 0.12 0.10 0.10 0.09 0.08 0.07 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) 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.83 0 591.84 1 591.87 2 591.93 4 592.04 6 592.20 12 592.57 27 593.50 53 595.12 85 597.12 85 597.14 85 597.16 86 597.20 87 597.27 91 597.49 91 597.50 88 597.34 87 597.28 87 597.24 86 597.23 86 597.21 86 597.19 86 597.19 86 597.18 86 597.18 86 597.17 85 597.16 85 597.16 85 597.16 85 597.15 85 597.15 85 597.15 85 597.15 85 597.15 85 597.14 85 597.14 85 597.14 85 597.14 85 597.14 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 0.00 0.03 0.04 0.06 0.11 0.22 0.78 0.82 0.36 0.23 0.17 0.15 0.12 0.10 0.10 0.09 0.08 0.07 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 Printed 5/13/2024 Page 83