J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 48 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Subcatchment 22S: PO-DA 6 Hydrograph 18 Runoff 17 16.29 cfs NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=96,853 sf Runoff Volume=1.791 af Runoff Depth>9.66" Flow Length=491' Tc=17.0 min CN=WQ 16 15 14 13 12 Flow (cfs) 11 10 9 8 7 6 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-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 49 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 22S: PO-DA 6 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 0.01 4.00 0.61 0.03 4.50 0.70 0.06 5.00 0.79 0.09 5.50 0.89 0.12 6.00 0.99 0.17 6.50 1.10 0.22 7.00 1.22 0.29 7.50 1.35 0.36 8.00 1.50 0.45 8.50 1.66 0.56 9.00 1.84 0.68 9.50 2.04 0.83 10.00 2.30 1.02 10.50 2.59 1.25 11.00 3.01 1.60 11.50 3.67 2.17 12.00 5.55 3.88 12.50 7.91 6.13 13.00 8.57 6.76 13.50 8.99 7.17 14.00 9.28 7.46 14.50 9.54 7.70 15.00 9.74 7.90 15.50 9.92 8.07 16.00 10.08 8.23 16.50 10.23 8.38 17.00 10.36 8.51 17.50 10.48 8.63 18.00 10.59 8.73 18.50 10.69 8.83 19.00 10.79 8.93 19.50 10.88 9.02 20.00 10.97 9.11 20.50 11.06 9.19 21.00 11.14 9.27 21.50 11.22 9.35 22.00 11.30 9.43 22.50 11.38 9.50 23.00 11.45 9.57 23.50 11.52 9.64 24.00 11.58 9.70 Runoff (cfs) 0.00 0.00 0.02 0.04 0.05 0.05 0.07 0.09 0.11 0.14 0.16 0.19 0.21 0.25 0.30 0.35 0.41 0.47 0.53 0.66 0.84 1.03 1.50 2.48 6.53 7.95 2.94 1.83 1.30 1.10 0.90 0.76 0.70 0.65 0.59 0.53 0.48 0.44 0.42 0.41 0.40 0.38 0.37 0.35 0.34 0.33 0.31 0.30 0.28

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 50 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 23S: PO-DA 8 Runoff = 4.01 cfs @ 12.14 hrs, Volume= Routed to Pond 20P : O-AquaShield 0.348 af, Depth>10.83" 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) 11,671 5,115 16,786 5,115 11,671 * CN 98 85 Description Impervious, Pavement, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 30.47% Pervious Area 69.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.9 100 0.0160 0.24 Sheet Flow, Gravel Sheet Flow n= 0.100 P2= 4.07" 0.6 78 0.0165 2.07 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 7.5 178 Total Subcatchment 23S: PO-DA 8 Hydrograph Runoff 4.01 cfs NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=16,786 sf Runoff Volume=0.348 af Runoff Depth>10.83" Flow Length=178' Tc=7.5 min CN=WQ 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-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 51 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 23S: PO-DA 8 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 0.01 2.00 0.28 0.03 2.50 0.36 0.06 3.00 0.44 0.10 3.50 0.52 0.15 4.00 0.61 0.21 4.50 0.70 0.27 5.00 0.79 0.34 5.50 0.89 0.41 6.00 0.99 0.49 6.50 1.10 0.59 7.00 1.22 0.69 7.50 1.35 0.81 8.00 1.50 0.94 8.50 1.66 1.08 9.00 1.84 1.24 9.50 2.04 1.44 10.00 2.30 1.67 10.50 2.59 1.96 11.00 3.01 2.36 11.50 3.67 3.00 12.00 5.55 4.85 12.50 7.91 7.19 13.00 8.57 7.85 13.50 8.99 8.26 14.00 9.28 8.56 14.50 9.54 8.81 15.00 9.74 9.02 15.50 9.92 9.19 16.00 10.08 9.35 16.50 10.23 9.50 17.00 10.36 9.63 17.50 10.48 9.75 18.00 10.59 9.86 18.50 10.69 9.96 19.00 10.79 10.06 19.50 10.88 10.15 20.00 10.97 10.24 20.50 11.06 10.33 21.00 11.14 10.41 21.50 11.22 10.49 22.00 11.30 10.57 22.50 11.38 10.64 23.00 11.45 10.72 23.50 11.52 10.78 24.00 11.58 10.85 Runoff (cfs) 0.00 0.00 0.02 0.03 0.03 0.04 0.04 0.04 0.05 0.05 0.06 0.06 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.15 0.19 0.23 0.34 0.55 2.07 0.86 0.45 0.29 0.22 0.18 0.15 0.13 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.06 0.05 0.05 0.05

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 52 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 20P: O-AquaShield Inflow Area = Inflow = Primary = 2.609 ac, 26.54% Impervious, Inflow Depth > 9.84" for 100-Year_Future event 18.67 cfs @ 12.22 hrs, Volume= 2.138 af 18.67 cfs @ 12.22 hrs, Volume= 2.138 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Pond 20P: O-AquaShield Flow (cfs) Hydrograph Inflow Primary 18.67 cfs 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.609 ac 18.67 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 (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" Prepared by Burns & McDonnell Printed 5/13/2024 Page 53 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 20P: O-AquaShield 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 Elevation (cfs) (feet) 0.00 0.00 0.04 0.06 0.08 0.09 0.11 0.14 0.16 0.19 0.22 0.25 0.27 0.32 0.38 0.44 0.51 0.58 0.66 0.81 1.03 1.26 1.84 3.03 8.59 8.81 3.39 2.11 1.52 1.28 1.05 0.89 0.82 0.76 0.69 0.62 0.56 0.51 0.50 0.48 0.46 0.45 0.43 0.42 0.40 0.38 0.37 0.35 0.33 Primary (cfs) 0.00 0.00 0.04 0.06 0.08 0.09 0.11 0.14 0.16 0.19 0.22 0.25 0.27 0.32 0.38 0.44 0.51 0.58 0.66 0.81 1.03 1.26 1.84 3.03 8.59 8.81 3.39 2.11 1.52 1.28 1.05 0.89 0.82 0.76 0.69 0.62 0.56 0.51 0.50 0.48 0.46 0.45 0.43 0.42 0.40 0.38 0.37 0.35 0.33

APPENDIX B.2- PRE-DEVELOPED OUTFALL = O-1

PRE-DEVELOPED: OUTFALL = O-1 Subcat 22P 24S O-1 PO-DA 7 Reach Pond Link Routing Diagram for West Orange HydroCAD_Pre Prepared by Burns & McDonnell, Printed 5/13/2024 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC

Post-Developed (O-1) West Orange HydroCAD_Pre 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 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 2-Year_Current Event 6 Node Listing 7 Subcat 24S: PO-DA 7 10 Pond 22P: O-1 2-Year_Future Event 12 Node Listing 13 Subcat 24S: PO-DA 7 16 Pond 22P: O-1 10-Year_Current Event 18 Node Listing 19 Subcat 24S: PO-DA 7 22 Pond 22P: O-1 10-Year_Future Event 24 Node Listing 25 Subcat 24S: PO-DA 7 28 Pond 22P: O-1 100-Year_Current Event 30 Node Listing 31 Subcat 24S: PO-DA 7 34 Pond 22P: O-1 100-Year_Future Event 36 Node Listing 37 Subcat 24S: PO-DA 7 40 Pond 22P: O-1

Post-Developed (O-1) West Orange HydroCAD_Pre 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 Event# 1 2 3 4 5 6 Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) 2-Year_Current 2-Year_Future 10-Year_Current 10-Year_Future 100-Year_Current 100-Year_Future NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr D D D D D D Default Default Default Default Default Default 24.00 24.00 24.00 24.00 24.00 24.00 1 1 1 1 1 1 3.45 4.07 5.37 6.36 9.23 11.58 AMC 2 2 2 2 2 2 P2 (inches) 3.45 4.07 3.45 4.07 3.45 4.07