J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1B) 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 Pond 17P: SD-23 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 0.02 0.03 0.04 0.06 0.08 0.09 0.11 0.12 0.14 0.16 0.18 0.21 0.23 0.26 0.29 0.34 0.40 0.47 0.61 0.89 3.47 2.47 1.86 1.27 1.03 0.93 0.89 0.85 0.82 0.79 0.76 0.72 0.63 0.55 0.50 0.46 0.42 0.38 0.35 0.32 0.29 0.26 0.24 0.22 Storage Elevation (acre-feet) (feet) 0.000 586.80 0.000 586.80 0.000 586.81 0.000 586.83 0.000 586.85 0.000 586.87 0.000 586.88 0.000 586.90 0.000 586.91 0.000 586.93 0.000 586.94 0.000 586.95 0.000 586.96 0.000 586.97 0.000 586.98 0.000 586.99 0.000 587.01 0.000 587.02 0.000 587.03 0.000 587.05 0.000 587.07 0.000 587.09 0.000 587.12 0.000 587.16 0.000 587.24 0.001 587.78 0.000 587.59 0.000 587.47 0.000 587.34 0.000 587.28 0.000 587.26 0.000 587.24 0.000 587.23 0.000 587.23 0.000 587.22 0.000 587.21 0.000 587.20 0.000 587.17 0.000 587.14 0.000 587.13 0.000 587.11 0.000 587.10 0.000 587.08 0.000 587.07 0.000 587.06 0.000 587.05 0.000 587.03 0.000 587.02 0.000 587.01 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.06 0.08 0.09 0.11 0.12 0.14 0.16 0.18 0.21 0.23 0.26 0.29 0.34 0.40 0.47 0.61 0.88 3.47 2.47 1.87 1.28 1.03 0.93 0.89 0.85 0.82 0.79 0.76 0.72 0.63 0.55 0.50 0.46 0.42 0.38 0.35 0.32 0.29 0.26 0.24 0.22 Printed 5/13/2024 Page 282

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 283 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 > 9.84" for 100-Year_Future event Inflow = 3.95 cfs @ 12.26 hrs, Volume= 0.752 af Outflow = 3.95 cfs @ 12.27 hrs, Volume= 0.752 af, Atten= 0%, Lag= 0.5 min Primary = 3.95 cfs @ 12.27 hrs, Volume= 0.752 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= 590.04' @ 12.27 hrs Surf.Area= 0.001 ac Storage= 0.001 af Plug-Flow detention time= 0.1 min calculated for 0.752 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 849.2 - 849.1 ) 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=3.95 cfs @ 12.27 hrs HW=590.04' TW=587.94' (Dynamic Tailwater) 1=SD-22 (Orifice Controls 3.95 cfs @ 5.02 fps) Pond 18P: SD-22 Hydrograph Inflow Primary 3.95 cfs Inflow Area=0.917 ac Peak Elev=590.04' Storage=0.001 af 3.95 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 (O-1B) 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 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 0.01 0.02 0.02 0.03 0.04 0.05 0.07 0.08 0.09 0.10 0.11 0.13 0.15 0.17 0.19 0.21 0.24 0.28 0.34 0.44 0.66 3.08 1.96 1.37 0.82 0.63 0.58 0.55 0.52 0.49 0.47 0.45 0.42 0.37 0.32 0.29 0.27 0.25 0.23 0.21 0.19 0.18 0.17 0.15 0.14 Storage Elevation (acre-feet) (feet) 0.000 588.45 0.000 588.45 0.000 588.46 0.000 588.48 0.000 588.49 0.000 588.51 0.000 588.52 0.000 588.53 0.000 588.55 0.000 588.56 0.000 588.57 0.000 588.58 0.000 588.59 0.000 588.60 0.000 588.61 0.000 588.62 0.000 588.64 0.000 588.65 0.000 588.66 0.000 588.67 0.000 588.69 0.000 588.71 0.000 588.73 0.000 588.78 0.000 588.86 0.001 589.62 0.000 589.23 0.000 589.07 0.000 588.91 0.000 588.85 0.000 588.83 0.000 588.82 0.000 588.81 0.000 588.80 0.000 588.79 0.000 588.78 0.000 588.77 0.000 588.75 0.000 588.73 0.000 588.72 0.000 588.70 0.000 588.69 0.000 588.68 0.000 588.67 0.000 588.66 0.000 588.65 0.000 588.65 0.000 588.64 0.000 588.63 Primary (cfs) 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.03 0.04 0.05 0.07 0.08 0.09 0.10 0.11 0.13 0.15 0.17 0.19 0.21 0.24 0.28 0.34 0.44 0.65 3.09 1.97 1.37 0.82 0.63 0.58 0.55 0.52 0.49 0.47 0.45 0.42 0.37 0.32 0.29 0.27 0.25 0.23 0.21 0.19 0.18 0.17 0.15 0.14 Printed 5/13/2024 Page 284

Post-Developed (O-1B) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 285 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 > 9.74" for 100-Year_Future event Inflow = 1.65 cfs @ 12.58 hrs, Volume= 0.460 af Outflow = 1.65 cfs @ 12.58 hrs, Volume= 0.460 af, Atten= 0%, Lag= 0.2 min Primary = 1.65 cfs @ 12.58 hrs, Volume= 0.460 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= 591.31' @ 12.58 hrs Surf.Area= 0.001 ac Storage= 0.000 af Plug-Flow detention time= 0.1 min calculated for 0.460 af (100% of inflow) Center-of-Mass det. time= 0.1 min ( 868.3 - 868.2 ) 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=1.65 cfs @ 12.58 hrs HW=591.31' TW=589.51' (Dynamic Tailwater) 1=SD-21 (Orifice Controls 1.65 cfs @ 2.84 fps) Pond 19P: SD-21 Hydrograph Inflow Primary 1.65 cfs Inflow Area=0.567 ac Peak Elev=591.31' Storage=0.000 af Flow (cfs) 1.65 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_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 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 0.01 0.01 0.02 0.02 0.03 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.10 0.11 0.12 0.14 0.16 0.19 0.25 0.32 1.64 1.45 1.04 0.53 0.36 0.34 0.34 0.33 0.32 0.32 0.31 0.30 0.26 0.23 0.21 0.19 0.17 0.16 0.15 0.13 0.12 0.11 0.10 0.09 Storage Elevation (acre-feet) (feet) 0.000 590.61 0.000 590.61 0.000 590.61 0.000 590.63 0.000 590.64 0.000 590.65 0.000 590.66 0.000 590.67 0.000 590.68 0.000 590.69 0.000 590.70 0.000 590.71 0.000 590.72 0.000 590.72 0.000 590.73 0.000 590.74 0.000 590.75 0.000 590.76 0.000 590.77 0.000 590.78 0.000 590.79 0.000 590.81 0.000 590.82 0.000 590.86 0.000 590.89 0.000 591.30 0.000 591.25 0.000 591.14 0.000 590.97 0.000 590.91 0.000 590.90 0.000 590.90 0.000 590.89 0.000 590.89 0.000 590.89 0.000 590.88 0.000 590.88 0.000 590.86 0.000 590.84 0.000 590.83 0.000 590.82 0.000 590.81 0.000 590.80 0.000 590.80 0.000 590.79 0.000 590.78 0.000 590.77 0.000 590.76 0.000 590.76 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.02 0.03 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.10 0.11 0.12 0.14 0.16 0.19 0.25 0.32 1.64 1.46 1.04 0.53 0.36 0.34 0.34 0.33 0.32 0.32 0.31 0.30 0.26 0.23 0.21 0.19 0.17 0.16 0.15 0.13 0.12 0.11 0.10 0.09 Printed 5/13/2024 Page 286

APPENDIX B.7- POST-DEVELOPED OUTFALL = O-2

POST-DEVELOPED: OUTFALL = O-2 16S PO-DA N 25P O-2 Subcat Reach Pond Link Routing Diagram for West Orange HydroCAD_Post Prepared by Burns & McDonnell, Printed 5/13/2024 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC

Post-Developed (O-2) West Orange HydroCAD_Post Table of Contents Prepared by Burns & McDonnell Printed 5/13/2024 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) WQ Event 6 Node Listing 7 Subcat 16S: PO-DA N 10 Pond 25P: O-2 2-Year_Current Event 12 Node Listing 13 Subcat 16S: PO-DA N 16 Pond 25P: O-2 2-Year_Future Event 18 Node Listing 19 Subcat 16S: PO-DA N 22 Pond 25P: O-2 10-Year_Current Event 24 Node Listing 25 Subcat 16S: PO-DA N 28 Pond 25P: O-2 10-Year_Future Event 30 Node Listing 31 Subcat 16S: PO-DA N 34 Pond 25P: O-2 100-Year_Current Event 36 Node Listing 37 Subcat 16S: PO-DA N 40 Pond 25P: O-2 100-Year_Future Event 42 Node Listing 43 Subcat 16S: PO-DA N 46 Pond 25P: O-2

Post-Developed (O-2) West Orange HydroCAD_Post Printed 5/13/2024 Page 2 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# 1 2 3 4 5 6 7 Event Name Storm Type WQ 2-Year_Current 2-Year_Future 10-Year_Current 10-Year_Future 100-Year_Current 100-Year_Future NJ DEP 2-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr Curve Mode Duration (hours) B/B Depth (inches) D D D D D D Default Default Default Default Default Default Default 2.00 24.00 24.00 24.00 24.00 24.00 24.00 1 1 1 1 1 1 1 1.25 3.45 4.07 5.37 6.36 9.23 11.58 AMC 2 2 2 2 2 2 2 P2 (inches) 3.42 3.45 4.07 3.45 4.07 3.45 4.07

Post-Developed (O-2) West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.428 0.528 0.210 0.153 1.319 80 73 98 85 81 >75% Grass cover, Good, HSG D (16S) Brush, Good, HSG D (16S) Impervious, Pavement, HSG D (16S) Yard Stone/Gravel Pad, HSG D (16S) TOTAL AREA Printed 5/13/2024 Page 3