J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 274 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 20P: SD-11, SD-12 Hydrograph Inflow Primary 9.74 cfs Inflow Area=1.308 ac Peak Elev=593.05' Storage=256 cf 9.69 cfs 10 9 8 Flow (cfs) 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-1A) 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 20P: SD-11, SD-12 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 (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.08 0.10 0.13 0.16 0.19 0.26 0.35 0.45 0.73 1.28 4.60 3.07 1.46 0.93 0.70 0.59 0.48 0.42 0.39 0.36 0.33 0.29 0.26 0.24 0.24 0.23 0.22 0.21 0.21 0.20 0.19 0.18 0.18 0.17 0.16 Storage Elevation (cubic-feet) (feet) 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.26 0 590.27 1 590.31 2 590.39 7 590.80 10 591.05 10 591.06 11 591.07 11 591.12 12 591.14 12 591.15 13 591.17 13 591.19 14 591.22 15 591.26 16 591.29 20 591.38 27 591.51 82 592.03 56 591.83 30 591.55 23 591.43 20 591.37 18 591.34 17 591.30 16 591.28 16 591.27 15 591.26 15 591.25 14 591.24 14 591.22 14 591.21 14 591.21 14 591.21 13 591.20 13 591.20 13 591.20 13 591.19 13 591.19 13 591.18 13 591.18 13 591.18 13 591.17 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.07 0.10 0.13 0.16 0.19 0.26 0.35 0.45 0.72 1.28 4.46 3.11 1.46 0.94 0.70 0.59 0.48 0.42 0.39 0.36 0.33 0.29 0.26 0.25 0.24 0.23 0.22 0.21 0.21 0.20 0.19 0.18 0.18 0.17 0.16 Printed 5/13/2024 Page 275

Post-Developed (O-1A) 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 Printed 5/13/2024 Page 276 Summary for Pond 23P: SD-01, SD-02 Inflow Area = 0.656 ac, 0.00% Impervious, Inflow Depth > 8.16" for 100-Year_Future event Inflow = 4.89 cfs @ 12.20 hrs, Volume= 0.446 af Outflow = 4.82 cfs @ 12.22 hrs, Volume= 0.444 af, Atten= 1%, Lag= 1.1 min Primary = 4.82 cfs @ 12.22 hrs, Volume= 0.444 af Routed to Pond 12P : SD-03, SD-04, SD-05 Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.0100 hrs Peak Elev= 599.17' @ 12.22 hrs Surf.Area= 91 sf Storage= 204 cf Plug-Flow detention time= 4.9 min calculated for 0.444 af (100% of inflow) Center-of-Mass det. time= 2.2 min ( 815.3 - 813.1 ) Volume #1 #2 #3 Invert 602.00' 591.82' 598.38' Avail.Storage 5,354,109 cf 163 cf 25 cf #4 #5 598.06' 597.81' 118 cf 61 cf 5,354,476 cf Elevation (feet) 602.00 603.00 Surf.Area (sq-ft) 696,960 12,422,876 Elevation (feet) 591.82 602.00 Surf.Area (sq-ft) 16 16 Inc.Store (cubic-feet) 0 163 Cum.Store (cubic-feet) 0 163 Elevation (feet) 598.06 607.15 Surf.Area (sq-ft) 13 13 Inc.Store (cubic-feet) 0 118 Cum.Store (cubic-feet) 0 118 Device #1 Routing Primary Perim. (feet) 16.0 130.1 Storage Description Drainage Ditch Storage (Irregular)Listed below (Recalc) CB-1 (Prismatic) Listed below (Recalc) 12.0" Round SD-01 L= 31.6' S= 0.0100 '/' MH-01 (Prismatic) Listed below (Recalc) 12.0" Round SD-02 L= 78.0' S= 0.0100 '/' Total Available Storage Invert 597.04' Inc.Store (cubic-feet) 0 5,354,109 Cum.Store (cubic-feet) 0 5,354,109 Wet.Area (sq-ft) 696,960 698,289 Outlet Devices 12.0" Vert. SD-02 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.82 cfs @ 12.22 hrs HW=599.16' TW=597.17' (Dynamic Tailwater) 1=SD-02 (Orifice Controls 4.82 cfs @ 6.13 fps)

Post-Developed (O-1A) NOAA 24-hr D 100-Year_Future Rainfall=11.58", P2=4.07" West Orange HydroCAD_Post Printed 5/13/2024 Page 277 Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Pond 23P: SD-01, SD-02 Hydrograph Inflow Primary 4.89 cfs Inflow Area=0.656 ac Peak Elev=599.17' Storage=204 cf 4.82 cfs 5 Flow (cfs) 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-1A) 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 23P: SD-01, SD-02 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 (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.04 0.05 0.06 0.08 0.09 0.13 0.17 0.22 0.35 0.62 2.04 1.65 0.75 0.48 0.35 0.30 0.24 0.21 0.19 0.18 0.16 0.15 0.13 0.12 0.12 0.11 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 0.08 Storage Elevation (cubic-feet) (feet) 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.82 0 591.83 0 591.85 2 591.92 4 592.07 8 592.31 20 593.04 43 594.52 80 596.81 85 597.13 85 597.14 85 597.16 86 597.17 86 597.19 86 597.21 87 597.24 87 597.27 88 597.33 90 597.44 96 597.83 95 597.74 91 597.48 89 597.38 88 597.33 88 597.31 87 597.28 87 597.26 87 597.25 87 597.25 87 597.24 86 597.23 86 597.22 86 597.21 86 597.21 86 597.20 86 597.20 86 597.20 86 597.19 86 597.19 86 597.19 86 597.19 86 597.18 86 597.18 86 597.18 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.05 0.06 0.08 0.09 0.13 0.17 0.22 0.35 0.62 2.03 1.66 0.75 0.48 0.35 0.30 0.24 0.21 0.19 0.18 0.16 0.15 0.13 0.12 0.12 0.11 0.11 0.11 0.10 0.10 0.10 0.09 0.09 0.08 0.08 Printed 5/13/2024 Page 278

APPENDIX B.6- POST-DEVELOPED OUTFALL = O-1B

POST-DEVELOPED: OUTFALL = O-1B 5S 1P 19P 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 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-1B) 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) WQ Event 7 Node Listing 9 Subcat 5S: PO-DA C 11 Subcat 7S: PO-DA E 13 Subcat 9S: PO-DA G 15 Subcat 11S: PO-DA I 17 Subcat 12S: PO-DA J 19 Pond 1P: BR-01 22 Pond 2P: BR-02 25 Pond 3P: BR-03 28 Pond 5P: BR-05 31 Pond 6P: BR-04 34 Pond 8P: O-1B 36 Pond 13P: SD-25, SD-26 39 Pond 14P: SD-24 41 Pond 17P: SD-23 43 Pond 18P: SD-22 45 Pond 19P: SD-21 2-Year_Current Event 47 Node Listing 49 Subcat 5S: PO-DA C 51 Subcat 7S: PO-DA E 53 Subcat 9S: PO-DA G 55 Subcat 11S: PO-DA I 57 Subcat 12S: PO-DA J 59 Pond 1P: BR-01 62 Pond 2P: BR-02 65 Pond 3P: BR-03 68 Pond 5P: BR-05 71 Pond 6P: BR-04 74 Pond 8P: O-1B 76 Pond 13P: SD-25, SD-26 79 Pond 14P: SD-24 81 Pond 17P: SD-23 83 Pond 18P: SD-22 85 Pond 19P: SD-21

Post-Developed (O-1B) 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 87 Node Listing 89 Subcat 5S: PO-DA C 91 Subcat 7S: PO-DA E 93 Subcat 9S: PO-DA G 95 Subcat 11S: PO-DA I 97 Subcat 12S: PO-DA J 99 Pond 1P: BR-01 102 Pond 2P: BR-02 105 Pond 3P: BR-03 108 Pond 5P: BR-05 111 Pond 6P: BR-04 114 Pond 8P: O-1B 116 Pond 13P: SD-25, SD-26 119 Pond 14P: SD-24 121 Pond 17P: SD-23 123 Pond 18P: SD-22 125 Pond 19P: SD-21 10-Year_Current Event 127 Node Listing 129 Subcat 5S: PO-DA C 131 Subcat 7S: PO-DA E 133 Subcat 9S: PO-DA G 135 Subcat 11S: PO-DA I 137 Subcat 12S: PO-DA J 139 Pond 1P: BR-01 142 Pond 2P: BR-02 145 Pond 3P: BR-03 148 Pond 5P: BR-05 151 Pond 6P: BR-04 154 Pond 8P: O-1B 156 Pond 13P: SD-25, SD-26 159 Pond 14P: SD-24 161 Pond 17P: SD-23 163 Pond 18P: SD-22 165 Pond 19P: SD-21 10-Year_Future Event 167 Node Listing 169 Subcat 5S: PO-DA C 171 Subcat 7S: PO-DA E 173 Subcat 9S: PO-DA G 175 Subcat 11S: PO-DA I 177 Subcat 12S: PO-DA J 179 Pond 1P: BR-01 182 Pond 2P: BR-02

Post-Developed (O-1B) 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 185 188 191 194 196 199 201 203 205 Pond 3P: BR-03 Pond 5P: BR-05 Pond 6P: BR-04 Pond 8P: O-1B Pond 13P: SD-25, SD-26 Pond 14P: SD-24 Pond 17P: SD-23 Pond 18P: SD-22 Pond 19P: SD-21 100-Year_Current Event 207 Node Listing 209 Subcat 5S: PO-DA C 211 Subcat 7S: PO-DA E 213 Subcat 9S: PO-DA G 215 Subcat 11S: PO-DA I 217 Subcat 12S: PO-DA J 219 Pond 1P: BR-01 222 Pond 2P: BR-02 225 Pond 3P: BR-03 228 Pond 5P: BR-05 231 Pond 6P: BR-04 234 Pond 8P: O-1B 236 Pond 13P: SD-25, SD-26 239 Pond 14P: SD-24 241 Pond 17P: SD-23 243 Pond 18P: SD-22 245 Pond 19P: SD-21 100-Year_Future Event 247 Node Listing 249 Subcat 5S: PO-DA C 251 Subcat 7S: PO-DA E 253 Subcat 9S: PO-DA G 255 Subcat 11S: PO-DA I 257 Subcat 12S: PO-DA J 259 Pond 1P: BR-01 262 Pond 2P: BR-02 265 Pond 3P: BR-03 268 Pond 5P: BR-05 271 Pond 6P: BR-04 274 Pond 8P: O-1B 276 Pond 13P: SD-25, SD-26 279 Pond 14P: SD-24 281 Pond 17P: SD-23 283 Pond 18P: SD-22 285 Pond 19P: SD-21