J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-2) 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 40 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 21P: O-2 Inflow Area = Inflow = Primary = 1.212 ac, 14.94% Impervious, Inflow Depth > 8.99" for 100-Year_Future event 12.86 cfs @ 12.11 hrs, Volume= 0.908 af 12.86 cfs @ 12.11 hrs, Volume= 0.908 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 21P: O-2 Hydrograph 14 Inflow Primary 12.86 cfs Inflow Area=1.212 ac 12.86 cfs 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-2) 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 41 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 21P: O-2 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 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.13 0.15 0.18 0.21 0.25 0.33 0.42 0.53 0.85 1.48 7.37 2.37 1.25 0.81 0.64 0.54 0.44 0.39 0.36 0.33 0.30 0.27 0.24 0.23 0.22 0.22 0.21 0.20 0.19 0.19 0.18 0.17 0.16 0.16 0.15 Primary (cfs) 0.00 0.00 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.06 0.07 0.08 0.10 0.13 0.15 0.18 0.21 0.25 0.33 0.42 0.53 0.85 1.48 7.37 2.37 1.25 0.81 0.64 0.54 0.44 0.39 0.36 0.33 0.30 0.27 0.24 0.23 0.22 0.22 0.21 0.20 0.19 0.19 0.18 0.17 0.16 0.16 0.15

APPENDIX B.4- POST-DEVELOPED OUTFALL = O-AQUASHIELD

POST-DEVELOPED: OUTFALL = O-AQUASHIELD 3S PO-DA A 15S PO-DA M 4P AquaShield 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-AquaShield) 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 3S: PO-DA A 10 Subcat 15S: PO-DA M 12 Pond 4P: AquaShield 2-Year_Current Event 14 Node Listing 15 Subcat 3S: PO-DA A 18 Subcat 15S: PO-DA M 20 Pond 4P: AquaShield 2-Year_Future Event 22 Node Listing 23 Subcat 3S: PO-DA A 26 Subcat 15S: PO-DA M 28 Pond 4P: AquaShield 10-Year_Current Event 30 Node Listing 31 Subcat 3S: PO-DA A 34 Subcat 15S: PO-DA M 36 Pond 4P: AquaShield 10-Year_Future Event 38 Node Listing 39 Subcat 3S: PO-DA A 42 Subcat 15S: PO-DA M 44 Pond 4P: AquaShield 100-Year_Current Event 46 Node Listing 47 Subcat 3S: PO-DA A 50 Subcat 15S: PO-DA M 52 Pond 4P: AquaShield 100-Year_Future Event 54 Node Listing

Post-Developed (O-AquaShield) 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 55 Subcat 3S: PO-DA A 58 Subcat 15S: PO-DA M 60 Pond 4P: AquaShield

Post-Developed (O-AquaShield) 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-AquaShield) 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) 0.327 0.339 0.540 1.015 2.221 80 73 98 85 86 >75% Grass cover, Good, HSG D (3S) Brush, Good, HSG D (3S) Impervious, Pavement, HSG D (3S, 15S) Yard Stone/Gravel Pad, HSG D (3S, 15S) TOTAL AREA Printed 5/13/2024 Page 3

Post-Developed (O-AquaShield) West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group 0.000 0.000 0.000 2.221 0.000 2.221 HSG A HSG B HSG C HSG D Other Subcatchment Numbers 3S, 15S TOTAL AREA Printed 5/13/2024 Page 4

Post-Developed (O-AquaShield) West Orange HydroCAD_Post Printed 5/13/2024 Page 5 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.327 0.339 0.540 1.015 2.221 0.000 0.000 0.000 0.000 0.000 0.327 0.339 0.540 1.015 2.221 >75% Grass cover, Good Brush, Good Impervious, Pavement Yard Stone/Gravel Pad TOTAL AREA 3S 3S 3S, 15S 3S, 15S