J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 157 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 3.25 cfs Inflow Area=1.308 ac Peak Elev=591.85' Storage=58 cf 3.25 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 10-Year_Current Rainfall=5.37", 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 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.08 0.15 0.31 1.31 1.15 0.55 0.36 0.27 0.23 0.19 0.16 0.15 0.14 0.13 0.12 0.10 0.10 0.09 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 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 0 590.26 0 590.27 0 590.27 0 590.29 1 590.33 2 590.39 5 590.67 10 591.04 10 591.05 11 591.07 12 591.12 13 591.17 15 591.24 27 591.51 26 591.48 18 591.33 15 591.26 14 591.23 14 591.21 13 591.19 13 591.17 13 591.17 12 591.16 12 591.15 12 591.15 12 591.14 12 591.13 12 591.13 12 591.13 12 591.13 12 591.13 12 591.12 12 591.12 11 591.12 11 591.12 11 591.11 11 591.11 11 591.11 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 0.01 0.02 0.03 0.08 0.15 0.31 1.28 1.16 0.55 0.36 0.27 0.23 0.19 0.16 0.15 0.14 0.13 0.12 0.10 0.10 0.09 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 Printed 5/13/2024 Page 158

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 159 Summary for Pond 23P: SD-01, SD-02 Inflow Area = 0.656 ac, 0.00% Impervious, Inflow Depth > 2.63" for 10-Year_Current event Inflow = 1.56 cfs @ 12.22 hrs, Volume= 0.144 af Outflow = 1.56 cfs @ 12.22 hrs, Volume= 0.142 af, Atten= 0%, Lag= 0.1 min Primary = 1.56 cfs @ 12.22 hrs, Volume= 0.142 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= 597.71' @ 12.22 hrs Surf.Area= 16 sf Storage= 94 cf Plug-Flow detention time= 11.7 min calculated for 0.142 af (99% of inflow) Center-of-Mass det. time= 4.0 min ( 852.9 - 849.0 ) 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=1.56 cfs @ 12.22 hrs HW=597.71' TW=596.59' (Dynamic Tailwater) 1=SD-02 (Orifice Controls 1.56 cfs @ 2.79 fps)

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Current Rainfall=5.37", P2=3.45" West Orange HydroCAD_Post Printed 5/13/2024 Page 160 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 1.56 cfs Inflow Area=0.656 ac Peak Elev=597.71' Storage=94 cf Flow (cfs) 1.56 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-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Current Rainfall=5.37", 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 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.04 0.07 0.15 0.57 0.62 0.28 0.18 0.13 0.12 0.09 0.08 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 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 0 591.82 0 591.82 0 591.83 0 591.85 1 591.89 2 591.96 4 592.08 7 592.25 14 592.71 31 593.78 64 595.85 85 597.13 86 597.17 86 597.23 90 597.42 90 597.44 88 597.30 87 597.25 86 597.22 86 597.20 86 597.19 86 597.18 86 597.17 86 597.17 85 597.16 85 597.16 85 597.15 85 597.14 85 597.14 85 597.14 85 597.14 85 597.14 85 597.14 85 597.13 85 597.13 85 597.13 85 597.13 85 597.13 85 597.13 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 0.00 0.00 0.04 0.07 0.15 0.57 0.62 0.28 0.18 0.14 0.12 0.09 0.08 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.03 Printed 5/13/2024 Page 161

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 162 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>3.45" Flow Length=298' Tc=12.4 min CN=WQ Runoff=2.11 cfs 0.189 af Subcatchment 4S: PO-DA B Runoff Area=6,403 sf 0.00% Impervious Runoff Depth>3.79" Flow Length=85' Slope=0.1773 '/' Tc=7.0 min CN=WQ Runoff=0.63 cfs 0.046 af Subcatchment 6S: PO-DA D Runoff Area=3,746 sf 0.00% Impervious Runoff Depth>3.62" Flow Length=66' Slope=0.2264 '/' Tc=5.2 min CN=WQ Runoff=0.38 cfs 0.026 af Subcatchment 8S: PO-DA F Runoff Area=10,281 sf 0.00% Impervious Runoff Depth>3.41" Flow Length=82' Slope=0.1736 '/' Tc=6.8 min CN=WQ Runoff=0.92 cfs 0.067 af Subcatchment 10S: PO-DA H Subcatchment 13S: PO-DA K Runoff Area=4,400 sf 30.68% Impervious Runoff Depth>4.40" Flow Length=239' Tc=13.4 min CN=WQ Runoff=0.38 cfs 0.037 af Subcatchment 14S: PO-DA L Runoff Area=7,972 sf 0.00% Impervious Runoff Depth>3.50" Flow Length=116' Tc=10.2 min CN=WQ Runoff=0.64 cfs 0.053 af Reach 3R: TD-01 Avg. Flow Depth=0.10' Max Vel=4.22 fps Inflow=0.63 cfs 0.046 af n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs Outflow=0.63 cfs 0.046 af Reach 4R: TD-02 Avg. Flow Depth=0.07' Max Vel=3.41 fps Inflow=0.38 cfs 0.026 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.38 cfs 0.026 af Reach 5R: TD-03 Avg. Flow Depth=0.23' Max Vel=2.61 fps Inflow=0.92 cfs 0.067 af n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs Outflow=0.91 cfs 0.067 af Reach 6R: TD-04 Avg. Flow Depth=0.12' Max Vel=3.52 fps Inflow=0.64 cfs 0.053 af n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs Outflow=0.64 cfs 0.053 af Pond 7P: O-1A Inflow=4.74 cfs 0.416 af Primary=4.74 cfs 0.416 af Pond 12P: SD-03, SD-04, SD-05 Peak Elev=596.71' Storage=42 cf Inflow=2.62 cfs 0.233 af Outflow=2.62 cfs 0.233 af Pond 15P: SD-06, SD-07, SD-08 Peak Elev=594.72' Storage=43 cf Inflow=2.88 cfs 0.259 af Outflow=2.88 cfs 0.259 af Pond 16P: SD-09, SD-10 Peak Elev=593.76' Storage=73 cf Inflow=3.75 cfs 0.326 af Outflow=3.75 cfs 0.326 af Pond 20P: SD-11, SD-12 Peak Elev=592.02'

nflow=2.88 cfs 0.259 af Outflow=2.88 cfs 0.259 af Pond 16P: SD-09, SD-10 Peak Elev=593.76' Storage=73 cf Inflow=3.75 cfs 0.326 af Outflow=3.75 cfs 0.326 af Pond 20P: SD-11, SD-12 Peak Elev=592.02' Storage=80 cf Inflow=4.39 cfs 0.379 af Outflow=4.38 cfs 0.379 af Pond 23P: SD-01, SD-02 Peak Elev=597.86' Storage=97 cf Inflow=2.11 cfs 0.189 af Outflow=2.11 cfs 0.187 af

Post-Developed (O-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 163 Total Runoff Area = 1.409 ac Runoff Volume = 0.419 af Average Runoff Depth = 3.57" 97.80% Pervious = 1.378 ac 2.20% Impervious = 0.031 ac

Post-Developed (O-1A) NOAA 24-hr D 10-Year_Future Rainfall=6.36", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 164 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: PO-DA B Runoff = 2.11 cfs @ 12.20 hrs, Volume= Routed to Pond 23P : SD-01, SD-02 0.189 af, Depth> 3.45" 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 10-Year_Future Rainfall=6.36", 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 2.11 cfs NOAA 24-hr D 10-Year_Future Rainfall=6.36" P2=4.07" Runoff Area=28,575 sf Runoff Volume=0.189 af Runoff Depth>3.45" Flow Length=298' Tc=12.4 min CN=WQ 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-1A) West Orange HydroCAD_Post NOAA 24-hr D 10-Year_Future Rainfall=6.36", 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 0.04 0.00 1.00 0.07 0.00 1.50 0.11 0.00 2.00 0.15 0.00 2.50 0.20 0.00 3.00 0.24 0.00 3.50 0.29 0.00 4.00 0.33 0.00 4.50 0.38 0.00 5.00 0.43 0.00 5.50 0.49 0.00 6.00 0.54 0.00 6.50 0.60 0.00 7.00 0.67 0.00 7.50 0.74 0.00 8.00 0.83 0.00 8.50 0.91 0.01 9.00 1.01 0.02 9.50 1.12 0.04 10.00 1.26 0.08 10.50 1.42 0.12 11.00 1.65 0.20 11.50 2.02 0.36 12.00 3.05 0.94 12.50 4.34 1.85 13.00 4.71 2.13 13.50 4.94 2.31 14.00 5.10 2.44 14.50 5.24 2.56 15.00 5.35 2.65 15.50 5.45 2.73 16.00 5.53 2.80 16.50 5.62 2.86 17.00 5.69 2.93 17.50 5.76 2.98 18.00 5.82 3.03 18.50 5.87 3.08 19.00 5.93 3.12 19.50 5.98 3.17 20.00 6.03 3.21 20.50 6.07 3.25 21.00 6.12 3.29 21.50 6.16 3.32 22.00 6.21 3.36 22.50 6.25 3.39 23.00 6.29 3.43 23.50 6.32 3.46 24.00 6.36 3.49 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.04 0.06 0.11 0.22 0.82 0.75 0.35 0.23 0.17 0.14 0.12 0.10 0.09 0.09 0.08 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 Printed 5/13/2024 Page 165