J_2024 05 09_West Orange Stormwater Management Plan

APPENDIX B - HYDROCAD OUTPUTS

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

PRE-DEVELOPED: OUTFALL = O-AQUASHIELD 22S PO-DA 6 23S 20P PO-DA 8 O-AquaShield Subcat 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-AquaShield) 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 22S: PO-DA 6 10 Subcat 23S: PO-DA 8 12 Pond 20P: O-AquaShield 2-Year_Future Event 14 Node Listing 15 Subcat 22S: PO-DA 6 18 Subcat 23S: PO-DA 8 20 Pond 20P: O-AquaShield 10-Year_Current Event 22 Node Listing 23 Subcat 22S: PO-DA 6 26 Subcat 23S: PO-DA 8 28 Pond 20P: O-AquaShield 10-Year_Future Event 30 Node Listing 31 Subcat 22S: PO-DA 6 34 Subcat 23S: PO-DA 8 36 Pond 20P: O-AquaShield 100-Year_Current Event 38 Node Listing 39 Subcat 22S: PO-DA 6 42 Subcat 23S: PO-DA 8 44 Pond 20P: O-AquaShield 100-Year_Future Event 46 Node Listing 47 Subcat 22S: PO-DA 6 50 Subcat 23S: PO-DA 8 52 Pond 20P: O-AquaShield

Post-Developed (O-AquaShield) 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

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre 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) 0.224 0.344 0.692 1.348 2.609 80 73 98 85 86 >75% Grass cover, Good, HSG D (22S) Brush, Good, HSG D (22S) Impervious, Pavement, HSG D (22S, 23S) Yard Stone/Gravel Pad, HSG D (22S, 23S) TOTAL AREA Printed 5/13/2024 Page 3

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre 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 2.609 0.000 2.609 HSG A HSG B HSG C HSG D Other Subcatchment Numbers 22S, 23S TOTAL AREA Printed 5/13/2024 Page 4

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre 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 0.224 0.344 0.692 0.000 0.000 0.000 0.224 0.344 0.692 0.000 0.000 0.000 1.348 0.000 1.348 0.000 0.000 0.000 2.609 0.000 2.609 >75% Grass cover, Good 22S Brush, Good 22S Impervious, Pavement 22S, 23S Yard Stone/Gravel Pad 22S, 23S TOTAL AREA

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" Prepared by Burns & McDonnell Printed 5/13/2024 Page 6 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC 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 Subcatchment 22S: PO-DA 6 Runoff Area=96,853 sf 19.09% Impervious Runoff Depth>2.04" Flow Length=491' Tc=18.1 min CN=WQ Runoff=3.47 cfs 0.377 af Subcatchment 23S: PO-DA 8 Runoff Area=16,786 sf 69.53% Impervious Runoff Depth>2.83" Flow Length=178' Tc=8.1 min CN=WQ Runoff=1.07 cfs 0.091 af Pond 20P: O-AquaShield Inflow=4.09 cfs 0.468 af Primary=4.09 cfs 0.468 af Total Runoff Area = 2.609 ac Runoff Volume = 0.468 af Average Runoff Depth = 2.15" 73.46% Pervious = 1.917 ac 26.54% Impervious = 0.692 ac

Post-Developed (O-AquaShield) West Orange HydroCAD_Pre NOAA 24-hr D 2-Year_Current Rainfall=3.45", P2=3.45" Prepared by Burns & McDonnell Printed 5/13/2024 Page 7 HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 22S: PO-DA 6 Runoff = 3.47 cfs @ 12.27 hrs, Volume= Routed to Pond 20P : O-AquaShield 0.377 af, Depth> 2.04" 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 2-Year_Current Rainfall=3.45", P2=3.45" * Area (sf) 18,485 9,771 53,605 14,992 96,853 78,368 18,485 CN 98 80 85 73 Description Impervious, Pavement, HSG D >75% Grass cover, Good, HSG D Yard Stone/Gravel Pad, HSG D Brush, Good, HSG D Weighted Average 80.91% Pervious Area 19.09% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.9 100 0.0543 0.12 Sheet Flow, Sheet Flow Woods: Light underbrush n= 0.400 P2= 3.45" 0.5 67 0.0908 2.11 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.2 43 0.2813 3.71 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 3.5 281 0.0069 1.34 Shallow Concentrated Flow, Shallow Concentrated Flow Unpaved Kv= 16.1 fps 18.1 491 Total