J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-AquaShield) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 56 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Subcatchment 3S: PO-DA A Hydrograph Runoff 14 12.98 cfs NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=78,287 sf Runoff Volume=1.415 af Runoff Depth>9.45" Flow Length=491' Tc=17.1 min CN=WQ 13 12 11 10 Flow (cfs) 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_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 3S: PO-DA A 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 0.02 4.50 0.70 0.04 5.00 0.79 0.06 5.50 0.89 0.09 6.00 0.99 0.13 6.50 1.10 0.17 7.00 1.22 0.23 7.50 1.35 0.30 8.00 1.50 0.38 8.50 1.66 0.48 9.00 1.84 0.59 9.50 2.04 0.73 10.00 2.30 0.90 10.50 2.59 1.13 11.00 3.01 1.45 11.50 3.67 2.00 12.00 5.55 3.67 12.50 7.91 5.89 13.00 8.57 6.52 13.50 8.99 6.92 14.00 9.28 7.21 14.50 9.54 7.45 15.00 9.74 7.65 15.50 9.92 7.82 16.00 10.08 7.98 16.50 10.23 8.12 17.00 10.36 8.25 17.50 10.48 8.37 18.00 10.59 8.48 18.50 10.69 8.57 19.00 10.79 8.67 19.50 10.88 8.76 20.00 10.97 8.85 20.50 11.06 8.93 21.00 11.14 9.01 21.50 11.22 9.09 22.00 11.30 9.17 22.50 11.38 9.24 23.00 11.45 9.31 23.50 11.52 9.38 24.00 11.58 9.44 Runoff (cfs) 0.00 0.00 0.01 0.02 0.03 0.03 0.04 0.05 0.07 0.09 0.11 0.13 0.15 0.18 0.22 0.26 0.31 0.35 0.40 0.50 0.65 0.80 1.17 1.95 5.17 6.40 2.37 1.47 1.05 0.88 0.72 0.61 0.56 0.52 0.47 0.43 0.38 0.35 0.34 0.33 0.32 0.31 0.30 0.28 0.27 0.26 0.25 0.24 0.23 Printed 5/13/2024 Page 57

Post-Developed (O-AquaShield) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 58 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 15S: PO-DA M Runoff = 4.42 cfs @ 12.14 hrs, Volume= Routed to Pond 4P : AquaShield 0.385 af, Depth>10.90" 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) 13,651 4,808 18,459 4,808 13,651 * CN 98 85 Description Impervious, Pavement, HSG D Yard Stone/Gravel Pad, HSG D Weighted Average 26.05% Pervious Area 73.95% 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" 0.5 80 0.0160 2.57 Shallow Concentrated Flow, Gravel Shallow Concentrated Flow Paved Kv= 20.3 fps 7.4 180 Total Subcatchment 15S: PO-DA M Hydrograph Runoff 4.42 cfs NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=18,459 sf Runoff Volume=0.385 af Runoff Depth>10.90" Flow Length=180' Slope=0.0160 '/' Tc=7.4 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_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 15S: PO-DA M 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 0.02 2.00 0.28 0.04 2.50 0.36 0.08 3.00 0.44 0.13 3.50 0.52 0.18 4.00 0.61 0.25 4.50 0.70 0.31 5.00 0.79 0.39 5.50 0.89 0.47 6.00 0.99 0.55 6.50 1.10 0.65 7.00 1.22 0.76 7.50 1.35 0.88 8.00 1.50 1.02 8.50 1.66 1.16 9.00 1.84 1.33 9.50 2.04 1.52 10.00 2.30 1.77 10.50 2.59 2.05 11.00 3.01 2.46 11.50 3.67 3.11 12.00 5.55 4.96 12.50 7.91 7.31 13.00 8.57 7.97 13.50 8.99 8.38 14.00 9.28 8.68 14.50 9.54 8.93 15.00 9.74 9.14 15.50 9.92 9.31 16.00 10.08 9.47 16.50 10.23 9.62 17.00 10.36 9.75 17.50 10.48 9.88 18.00 10.59 9.98 18.50 10.69 10.08 19.00 10.79 10.18 19.50 10.88 10.28 20.00 10.97 10.37 20.50 11.06 10.45 21.00 11.14 10.54 21.50 11.22 10.62 22.00 11.30 10.69 22.50 11.38 10.77 23.00 11.45 10.84 23.50 11.52 10.91 24.00 11.58 10.97 Runoff (cfs) 0.00 0.00 0.02 0.03 0.04 0.04 0.05 0.05 0.06 0.06 0.06 0.07 0.07 0.08 0.09 0.10 0.12 0.13 0.14 0.17 0.21 0.25 0.38 0.61 2.30 0.94 0.49 0.31 0.24 0.20 0.16 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.08 0.08 0.08 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.05 Printed 5/13/2024 Page 59

Post-Developed (O-AquaShield) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 60 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: AquaShield Inflow Area = Inflow = Primary = 2.221 ac, 24.32% Impervious, Inflow Depth > 9.73" for 100-Year_Future event 15.60 cfs @ 12.21 hrs, Volume= 1.800 af 15.60 cfs @ 12.21 hrs, Volume= 1.800 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 4P: AquaShield Hydrograph 17 Inflow Primary 15.60 cfs Inflow Area=2.221 ac 15.60 cfs 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_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 4P: 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 0.03 0.05 0.06 0.07 0.08 0.11 0.13 0.15 0.17 0.20 0.22 0.26 0.31 0.36 0.42 0.48 0.54 0.68 0.86 1.05 1.55 2.56 7.47 7.34 2.86 1.78 1.29 1.09 0.89 0.75 0.70 0.64 0.59 0.53 0.47 0.44 0.42 0.41 0.39 0.38 0.37 0.35 0.34 0.32 0.31 0.30 0.28 Primary (cfs) 0.00 0.00 0.03 0.05 0.06 0.07 0.08 0.11 0.13 0.15 0.17 0.20 0.22 0.26 0.31 0.36 0.42 0.48 0.54 0.68 0.86 1.05 1.55 2.56 7.47 7.34 2.86 1.78 1.29 1.09 0.89 0.75 0.70 0.64 0.59 0.53 0.47 0.44 0.42 0.41 0.39 0.38 0.37 0.35 0.34 0.32 0.31 0.30 0.28 Printed 5/13/2024 Page 61

APPENDIX B.5- POST-DEVELOPED OUTFALL = O-1A

POST-DEVELOPED: OUTFALL = O-1A 4S 23P 12P 3R 6S PO-DA B SD-01, SD-02 SD-03, SD-04, SD-05 TD-01 PO-DA D 15P 4R 8S SD-06, SD-07, SD-08 TD-02 PO-DA F 16P 5R 10S SD-09, SD-10 TD-03 PO-DA H 20P 6R 14S SD-11, SD-12 TD-04 PO-DA L 13S 7P PO-DA K O-1A 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-1A) 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 8 Subcat 4S: PO-DA B 10 Subcat 6S: PO-DA D 12 Subcat 8S: PO-DA F 14 Subcat 10S: PO-DA H 16 Subcat 13S: PO-DA K 18 Subcat 14S: PO-DA L 20 Reach 3R: TD-01 22 Reach 4R: TD-02 24 Reach 5R: TD-03 26 Reach 6R: TD-04 28 Pond 7P: O-1A 30 Pond 12P: SD-03, SD-04, SD-05 33 Pond 15P: SD-06, SD-07, SD-08 36 Pond 16P: SD-09, SD-10 39 Pond 20P: SD-11, SD-12 42 Pond 23P: SD-01, SD-02 2-Year_Current Event 45 Node Listing 47 Subcat 4S: PO-DA B 49 Subcat 6S: PO-DA D 51 Subcat 8S: PO-DA F 53 Subcat 10S: PO-DA H 55 Subcat 13S: PO-DA K 57 Subcat 14S: PO-DA L 59 Reach 3R: TD-01 61 Reach 4R: TD-02 63 Reach 5R: TD-03 65 Reach 6R: TD-04 67 Pond 7P: O-1A 69 Pond 12P: SD-03, SD-04, SD-05 72 Pond 15P: SD-06, SD-07, SD-08 75 Pond 16P: SD-09, SD-10 78 Pond 20P: SD-11, SD-12 81 Pond 23P: SD-01, SD-02

Post-Developed (O-1A) 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 2-Year_Future Event 84 Node Listing 86 Subcat 4S: PO-DA B 88 Subcat 6S: PO-DA D 90 Subcat 8S: PO-DA F 92 Subcat 10S: PO-DA H 94 Subcat 13S: PO-DA K 96 Subcat 14S: PO-DA L 98 Reach 3R: TD-01 100 Reach 4R: TD-02 102 Reach 5R: TD-03 104 Reach 6R: TD-04 106 Pond 7P: O-1A 108 Pond 12P: SD-03, SD-04, SD-05 111 Pond 15P: SD-06, SD-07, SD-08 114 Pond 16P: SD-09, SD-10 117 Pond 20P: SD-11, SD-12 120 Pond 23P: SD-01, SD-02 10-Year_Current Event 123 Node Listing 125 Subcat 4S: PO-DA B 127 Subcat 6S: PO-DA D 129 Subcat 8S: PO-DA F 131 Subcat 10S: PO-DA H 133 Subcat 13S: PO-DA K 135 Subcat 14S: PO-DA L 137 Reach 3R: TD-01 139 Reach 4R: TD-02 141 Reach 5R: TD-03 143 Reach 6R: TD-04 145 Pond 7P: O-1A 147 Pond 12P: SD-03, SD-04, SD-05 150 Pond 15P: SD-06, SD-07, SD-08 153 Pond 16P: SD-09, SD-10 156 Pond 20P: SD-11, SD-12 159 Pond 23P: SD-01, SD-02 10-Year_Future Event 162 Node Listing 164 Subcat 4S: PO-DA B 166 Subcat 6S: PO-DA D 168 Subcat 8S: PO-DA F 170 Subcat 10S: PO-DA H 172 Subcat 13S: PO-DA K 174 Subcat 14S: PO-DA L 176 Reach 3R: TD-01