J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-2) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 44 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Subcatchment 16S: PO-DA N Hydrograph Runoff 12 11.03 cfs NOAA 24-hr D 100-Year_Future Rainfall=11.58" P2=4.07" Runoff Area=57,457 sf Runoff Volume=0.998 af Runoff Depth>9.08" Flow Length=452' Tc=11.0 min CN=WQ 11 10 9 Flow (cfs) 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_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 16S: PO-DA N 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 0.00 4.00 0.61 0.01 4.50 0.70 0.02 5.00 0.79 0.04 5.50 0.89 0.06 6.00 0.99 0.09 6.50 1.10 0.13 7.00 1.22 0.18 7.50 1.35 0.24 8.00 1.50 0.32 8.50 1.66 0.40 9.00 1.84 0.50 9.50 2.04 0.63 10.00 2.30 0.80 10.50 2.59 1.01 11.00 3.01 1.32 11.50 3.67 1.85 12.00 5.55 3.47 12.50 7.91 5.66 13.00 8.57 6.28 13.50 8.99 6.68 14.00 9.28 6.96 14.50 9.54 7.20 15.00 9.74 7.40 15.50 9.92 7.57 16.00 10.08 7.72 16.50 10.23 7.86 17.00 10.36 7.99 17.50 10.48 8.11 18.00 10.59 8.22 18.50 10.69 8.31 19.00 10.79 8.41 19.50 10.88 8.50 20.00 10.97 8.59 20.50 11.06 8.67 21.00 11.14 8.75 21.50 11.22 8.83 22.00 11.30 8.90 22.50 11.38 8.98 23.00 11.45 9.05 23.50 11.52 9.11 24.00 11.58 9.17 Runoff (cfs) 0.00 0.00 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.06 0.08 0.09 0.11 0.14 0.17 0.20 0.23 0.27 0.35 0.45 0.56 0.86 1.47 4.90 3.21 1.53 0.98 0.73 0.62 0.50 0.43 0.40 0.37 0.34 0.30 0.27 0.25 0.25 0.24 0.23 0.22 0.21 0.21 0.20 0.19 0.18 0.17 0.16 Printed 5/13/2024 Page 45

Post-Developed (O-2) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 46 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Summary for Pond 25P: O-2 Inflow Area = Inflow = Primary = 1.319 ac, 15.92% Impervious, Inflow Depth > 9.08" for 100-Year_Future event 11.03 cfs @ 12.18 hrs, Volume= 0.998 af 11.03 cfs @ 12.18 hrs, Volume= 0.998 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 25P: O-2 Hydrograph 12 Inflow Primary 11.03 cfs Inflow Area=1.319 ac 11.03 cfs 11 10 9 Flow (cfs) 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_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 25P: 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 0.03 0.03 0.04 0.04 0.05 0.06 0.08 0.09 0.11 0.14 0.17 0.20 0.23 0.27 0.35 0.45 0.56 0.86 1.47 4.90 3.21 1.53 0.98 0.73 0.62 0.50 0.43 0.40 0.37 0.34 0.30 0.27 0.25 0.25 0.24 0.23 0.22 0.21 0.21 0.20 0.19 0.18 0.17 0.16 Primary (cfs) 0.00 0.00 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.06 0.08 0.09 0.11 0.14 0.17 0.20 0.23 0.27 0.35 0.45 0.56 0.86 1.47 4.90 3.21 1.53 0.98 0.73 0.62 0.50 0.43 0.40 0.37 0.34 0.30 0.27 0.25 0.25 0.24 0.23 0.22 0.21 0.21 0.20 0.19 0.18 0.17 0.16 Printed 5/13/2024 Page 47

APPENDIX B.8- POST-DEVELOPED STORMWATER CONVEYANCE = 25-YEAR

POST-DEVELOPED: STORMWATER CONVEYANCE (25-YEAR) 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 19P 5S 1P PO-DA C BR-01 SD-21 7S 2P 18P PO-DA E BR-02 SD-22 9S 3P 17P PO-DA G BR-03 SD-23 12S 6P 14P PO-DA J BR-04 SD-24 11S 5P 13P PO-DA I BR-05 SD-25, SD-26 8P O-1B 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 (25-Year) 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) 6 Pipe Listing (selected nodes) 25-Year Event 7 Node Listing 9 Subcat 4S: PO-DA B 11 Subcat 5S: PO-DA C 13 Subcat 6S: PO-DA D 15 Subcat 7S: PO-DA E 17 Subcat 8S: PO-DA F 19 Subcat 9S: PO-DA G 21 Subcat 10S: PO-DA H 23 Subcat 11S: PO-DA I 25 Subcat 12S: PO-DA J 27 Subcat 13S: PO-DA K 29 Subcat 14S: PO-DA L 31 Reach 3R: TD-01 33 Reach 4R: TD-02 35 Reach 5R: TD-03 37 Reach 6R: TD-04 39 Pond 1P: BR-01 42 Pond 2P: BR-02 45 Pond 3P: BR-03 48 Pond 5P: BR-05 51 Pond 6P: BR-04 54 Pond 7P: O-1A 56 Pond 8P: O-1B 58 Pond 12P: SD-03, SD-04, SD-05 61 Pond 13P: SD-25, SD-26 64 Pond 14P: SD-24 66 Pond 15P: SD-06, SD-07, SD-08 69 Pond 16P: SD-09, SD-10 72 Pond 17P: SD-23 74 Pond 18P: SD-22 76 Pond 19P: SD-21 78 Pond 20P: SD-11, SD-12 81 Pond 23P: SD-01, SD-02

Post-Developed (25-Year) 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 Event Name Storm Type Curve Mode Duration (hours) B/B 25-Year NOAA 24-hr D Default 24.00 1 Depth (inches) 6.44 AMC 2 P2 (inches) 3.42

Post-Developed (25-Year) West Orange HydroCAD_Post Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 3 Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.503 80 1.147 0.542 1.081 3.272 73 98 85 82 >75% Grass cover, Good, HSG D (4S, 5S, 6S, 7S, 8S, 9S, 10S, 11S, 12S, 13S, 14S) Brush, Good, HSG D (4S, 6S, 8S, 10S, 13S, 14S) Impervious, Pavement, HSG D (5S, 7S, 9S, 11S, 12S, 13S) Yard Stone/Gravel Pad, HSG D (4S, 5S, 7S, 9S, 11S, 12S, 14S) TOTAL AREA

Post-Developed (25-Year) 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 3.272 0.000 3.272 HSG A HSG B HSG C HSG D Other Subcatchment Numbers 4S, 5S, 6S, 7S, 8S, 9S, 10S, 11S, 12S, 13S, 14S TOTAL AREA Printed 5/13/2024 Page 4