J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 235 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 20P: SD-11, SD-12 Hydrograph 8 Inflow Primary 7.18 cfs Inflow Area=1.308 ac Peak Elev=592.45' Storage=151 cf 7.15 cfs 7 6 Flow (cfs) 5 4 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 (O-1A) 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 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 0.01 0.01 0.02 0.03 0.07 0.09 0.12 0.16 0.22 0.30 0.49 0.89 3.20 2.43 1.13 0.72 0.54 0.46 0.37 0.32 0.30 0.28 0.25 0.23 0.20 0.19 0.18 0.18 0.17 0.17 0.16 0.15 0.15 0.14 0.14 0.13 0.12 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 0 590.27 0 590.28 1 590.33 2 590.40 7 590.80 10 591.04 10 591.06 11 591.07 11 591.11 12 591.13 12 591.15 13 591.17 13 591.20 14 591.24 17 591.31 22 591.42 56 591.83 45 591.73 25 591.48 20 591.38 17 591.32 16 591.30 15 591.27 15 591.25 14 591.24 14 591.23 14 591.22 14 591.21 13 591.20 13 591.19 13 591.19 13 591.18 13 591.18 13 591.18 13 591.17 13 591.17 12 591.17 12 591.16 12 591.16 12 591.16 12 591.15 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 0.02 0.03 0.07 0.09 0.12 0.16 0.22 0.30 0.48 0.88 3.12 2.45 1.13 0.73 0.54 0.46 0.37 0.32 0.30 0.28 0.25 0.23 0.20 0.19 0.18 0.18 0.17 0.17 0.16 0.15 0.15 0.14 0.14 0.13 0.12 Printed 5/13/2024 Page 236

Post-Developed (O-1A) 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 237 Summary for Pond 23P: SD-01, SD-02 Inflow Area = 0.656 ac, 0.00% Impervious, Inflow Depth > 5.98" for 100-Year_Current event Inflow = 3.52 cfs @ 12.21 hrs, Volume= 0.327 af Outflow = 3.51 cfs @ 12.22 hrs, Volume= 0.325 af, Atten= 0%, Lag= 0.5 min Primary = 3.51 cfs @ 12.22 hrs, Volume= 0.325 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= 598.40' @ 12.22 hrs Surf.Area= 78 sf Storage= 122 cf Plug-Flow detention time= 6.2 min calculated for 0.325 af (99% of inflow) Center-of-Mass det. time= 2.6 min ( 826.0 - 823.4 ) 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=3.51 cfs @ 12.22 hrs HW=598.40' TW=596.96' (Dynamic Tailwater) 1=SD-02 (Orifice Controls 3.51 cfs @ 4.47 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Current Rainfall=9.23", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 238 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 3.52 cfs Inflow Area=0.656 ac Peak Elev=598.40' Storage=122 cf 3.51 cfs 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 (O-1A) 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 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 0.01 0.01 0.02 0.03 0.04 0.06 0.08 0.11 0.14 0.23 0.42 1.41 1.31 0.58 0.37 0.27 0.23 0.19 0.16 0.15 0.14 0.13 0.11 0.10 0.09 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 0.06 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 0 591.84 1 591.87 2 591.95 4 592.09 8 592.30 17 592.90 38 594.19 72 596.32 85 597.13 85 597.14 85 597.15 86 597.17 86 597.20 86 597.22 87 597.28 89 597.36 94 597.67 93 597.65 90 597.42 88 597.34 88 597.30 87 597.27 87 597.25 87 597.23 87 597.23 86 597.22 86 597.21 86 597.20 86 597.19 86 597.19 86 597.19 86 597.18 86 597.18 86 597.18 86 597.18 86 597.17 86 597.17 86 597.17 86 597.16 85 597.16 85 597.16 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 0.03 0.04 0.06 0.08 0.11 0.14 0.23 0.42 1.40 1.32 0.58 0.37 0.27 0.23 0.19 0.16 0.15 0.14 0.13 0.11 0.10 0.09 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 0.06 Printed 5/13/2024 Page 239

Post-Developed (O-1A) 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 240 Time span=0.00-24.00 hrs, dt=0.0100 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=28,575 sf 0.00% Impervious Runoff Depth>8.16" Flow Length=298' Tc=12.4 min CN=WQ Runoff=4.89 cfs 0.446 af Subcatchment 4S: PO-DA B Runoff Area=6,403 sf 0.00% Impervious Runoff Depth>8.62" Flow Length=85' Slope=0.1773 '/' Tc=7.0 min CN=WQ Runoff=1.38 cfs 0.106 af Subcatchment 6S: PO-DA D Runoff Area=3,746 sf 0.00% Impervious Runoff Depth>8.39" Flow Length=66' Slope=0.2264 '/' Tc=5.2 min CN=WQ Runoff=0.84 cfs 0.060 af Subcatchment 8S: PO-DA F Runoff Area=10,281 sf 0.00% Impervious Runoff Depth>8.11" Flow Length=82' Slope=0.1736 '/' Tc=6.8 min CN=WQ Runoff=2.13 cfs 0.160 af Subcatchment 10S: PO-DA H Subcatchment 13S: PO-DA K Runoff Area=4,400 sf 30.68% Impervious Runoff Depth>9.30" Flow Length=239' Tc=13.4 min CN=WQ Runoff=0.79 cfs 0.078 af Subcatchment 14S: PO-DA L Runoff Area=7,972 sf 0.00% Impervious Runoff Depth>8.22" Flow Length=116' Tc=10.2 min CN=WQ Runoff=1.47 cfs 0.125 af Reach 3R: TD-01 Avg. Flow Depth=0.16' Max Vel=5.60 fps Inflow=1.38 cfs 0.106 af n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs Outflow=1.37 cfs 0.106 af Reach 4R: TD-02 Avg. Flow Depth=0.12' Max Vel=4.60 fps Inflow=0.84 cfs 0.060 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.84 cfs 0.060 af Reach 5R: TD-03 Avg. Flow Depth=0.41' Max Vel=3.41 fps Inflow=2.13 cfs 0.160 af n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs Outflow=2.11 cfs 0.159 af Reach 6R: TD-04 Avg. Flow Depth=0.21' Max Vel=4.72 fps Inflow=1.47 cfs 0.125 af n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs Outflow=1.47 cfs 0.125 af Pond 7P: O-1A Inflow=10.46 cfs 0.972 af Primary=10.46 cfs 0.972 af Pond 12P: SD-03, SD-04, SD-05 Peak Elev=597.18' Storage=91 cf Inflow=5.81 cfs 0.550 af Outflow=5.81 cfs 0.549 af Pond 15P: SD-06, SD-07, SD-08 Peak Elev=595.23' Storage=115 cf Inflow=6.31 cfs 0.609 af Outflow=6.31 cfs 0.609 af Pond 16P: SD-09, SD-10 Peak Elev=594.53' Storage=176 cf Inflow=8.29 cfs 0.769 af Outflow=8.28 cfs 0.769 af Pond 20P: SD-11, SD-12 Peak Elev=593.05'

flow=6.31 cfs 0.609 af Outflow=6.31 cfs 0.609 af Pond 16P: SD-09, SD-10 Peak Elev=594.53' Storage=176 cf Inflow=8.29 cfs 0.769 af Outflow=8.28 cfs 0.769 af Pond 20P: SD-11, SD-12 Peak Elev=593.05' Storage=256 cf Inflow=9.74 cfs 0.894 af Outflow=9.69 cfs 0.894 af Pond 23P: SD-01, SD-02 Peak Elev=599.17' Storage=204 cf Inflow=4.89 cfs 0.446 af Outflow=4.82 cfs 0.444 af

Post-Developed (O-1A) 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 241 Total Runoff Area = 1.409 ac Runoff Volume = 0.975 af Average Runoff Depth = 8.30" 97.80% Pervious = 1.378 ac 2.20% Impervious = 0.031 ac

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 242 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: PO-DA B Runoff = 4.89 cfs @ 12.20 hrs, Volume= Routed to Pond 23P : SD-01, SD-02 0.446 af, Depth> 8.16" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Area (sf) 1,873 610 26,092 28,575 28,575 * CN 80 85 73 Description >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Brush, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.4 100 0.0900 0.16 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 4.07" 0.3 64 0.1920 3.07 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 1.7 134 0.0094 1.34 8.07 Channel Flow, North Channel Area= 6.0 sf Perim= 9.3' r= 0.65' n= 0.080 Earth, long dense weeds 12.4 298 Total Subcatchment 4S: PO-DA B Hydrograph Runoff 4.89 cfs 5 NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=28,575 sf Runoff Volume=0.446 af Runoff Depth>8.16" Flow Length=298' Tc=12.4 min CN=WQ Flow (cfs) 4 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 (O-1A) 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 Subcatchment 4S: PO-DA B Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.50 0.06 0.00 1.00 0.13 0.00 1.50 0.20 0.00 2.00 0.28 0.00 2.50 0.36 0.00 3.00 0.44 0.00 3.50 0.52 0.00 4.00 0.61 0.00 4.50 0.70 0.00 5.00 0.79 0.00 5.50 0.89 0.01 6.00 0.99 0.02 6.50 1.10 0.04 7.00 1.22 0.07 7.50 1.35 0.10 8.00 1.50 0.15 8.50 1.66 0.21 9.00 1.84 0.28 9.50 2.04 0.37 10.00 2.30 0.50 10.50 2.59 0.66 11.00 3.01 0.91 11.50 3.67 1.36 12.00 5.55 2.81 12.50 7.91 4.84 13.00 8.57 5.44 13.50 8.99 5.82 14.00 9.28 6.09 14.50 9.54 6.32 15.00 9.74 6.51 15.50 9.92 6.67 16.00 10.08 6.82 16.50 10.23 6.96 17.00 10.36 7.08 17.50 10.48 7.19 18.00 10.59 7.30 18.50 10.69 7.39 19.00 10.79 7.48 19.50 10.88 7.57 20.00 10.97 7.65 20.50 11.06 7.73 21.00 11.14 7.81 21.50 11.22 7.89 22.00 11.30 7.96 22.50 11.38 8.03 23.00 11.45 8.10 23.50 11.52 8.16 24.00 11.58 8.22 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.04 0.05 0.06 0.08 0.09 0.13 0.17 0.22 0.35 0.62 2.04 1.65 0.75 0.48 0.35 0.30 0.24 0.21 0.19 0.18 0.16 0.15 0.13 0.12 0.12 0.11 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 0.08 Printed 5/13/2024 Page 243