1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Subcatchment 2: Parking Lot Hydrograph Runoff 1.13 cfs NOAA 24-hr D 1 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=7,658 sf Runoff Volume=0.085 af Flow (cfs) Runoff Depth=5.79" Flow Length=92' Tc=0.9 min CN=74/98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 84

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Subcatchment 4: Proposed Runoff = 0.99 cfs @ 12.06 hrs, Volume= 0.072 af, Depth= 5.20" Routed to Pond 5 : Pipes Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description 3,426 98 Roofs, HSG C 1,265 98 Paved parking, HSG C 2,575 74 >75% Grass cover, Good, HSG C 7,266 89 Weighted Average 2,575 74 35.44% Pervious Area 4,691 98 64.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.1 8 0.0650 1.50 Sheet Flow, 1 Smooth surfaces n= 0.011 P2= 4.09" 0.1 15 0.0670 1.73 Sheet Flow, 2 Smooth surfaces n= 0.011 P2= 4.09" 0.5 59 0.0500 2.02 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 4.09" 0.2 10 0.0250 1.07 Sheet Flow, 4 Smooth surfaces n= 0.011 P2= 4.09" 0.9 92 Total 85

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Subcatchment 4: Proposed Hydrograph Runoff 0.99 cfs 1 NOAA 24-hr D 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=7,266 sf Runoff Volume=0.072 af Flow (cfs) Runoff Depth=5.20" Flow Length=92' Tc=0.9 min CN=74/98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 86

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Subcatchment 6: Bypass Runoff = 0.12 cfs @ 12.12 hrs, Volume= 0.009 af, Depth= 3.50" Routed to Link 7 : Proposed Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description 1,318 74 >75% Grass cover, Good, HSG C 1,318 74 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.4 100 0.0650 0.31 Sheet Flow, 1 Grass: Short n= 0.150 P2= 4.09" 0.1 28 0.0900 4.50 Shallow Concentrated Flow, 2 Grassed Waterway Kv= 15.0 fps 5.5 128 Total Subcatchment 6: Bypass Hydrograph Runoff 0.13 0.12 cfs 0.12 NOAA 24-hr D 0.11 10-Year-2050 Rainfall=6.37" 0.1 P2=4.09" 0.09 Runoff Area=1,318 sf 0.08

P2=4.09" 0.09 Runoff Area=1,318 sf 0.08 Runoff Volume=0.009 af Flow (cfs) 0.07 Runoff Depth=3.50" 0.06 Flow Length=128' 0.05 Tc=5.5 min 0.04 CN=74/0 0.03 0.02 0.01 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 87

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Pond 3: Pervious Pavers Inflow Area = 0.176 ac, 86.88% Impervious, Inflow Depth = 5.79" for 10-Year-2050 event Inflow = 1.13 cfs @ 12.06 hrs, Volume= 0.085 af Outflow = 0.34 cfs @ 12.22 hrs, Volume= 0.085 af, Atten= 70%, Lag= 9.7 min Discarded = 0.11 cfs @ 11.25 hrs, Volume= 0.076 af Primary = 0.23 cfs @ 12.22 hrs, Volume= 0.009 af Routed to Pond 5 : Pipes Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 414.80' @ 12.22 hrs Surf.Area= 1,620 sf Storage= 843 cf Plug-Flow detention time= 35.1 min calculated for 0.085 af (100% of inflow) Center-of-Mass det. time= 35.1 min ( 782.8 - 747.7 ) Volume Invert Avail.Storage Storage Description #1 413.50' 1,730 cf 60.00'W x 27.00'L x 2.67'H STONE & PAVERS 4,325 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 413.50' 2.900 in/hr Exfiltration over Surface area #2 Primary 414.50' 6.0" Round Culvert L= 50.0' Ke= 0.200 Inlet / Outlet Invert= 414.50' / 414.17' S= 0.0066 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.20 sf Discarded OutFlow Max=0.11 cfs @ 11.25 hrs HW=413.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.11 cfs) Primary OutFlow Max=0.22 cfs @ 12.22 hrs HW=414.80' (Free Discharge) 2=Culvert (Barrel Controls 0.22 cfs @ 2.63 fps) 88

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Pond 3: Pervious Pavers Hydrograph 1.13 cfs Inflow Outflow Inflow Area=0.176 ac Discarded Primary Peak Elev=414.80' 1 Storage=843 cf Flow (cfs) 0.34 cfs 0.23 cfs 0.11 cfs 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 89

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Pond 5: Pipes Inflow Area = 0.343 ac, 76.01% Impervious, Inflow Depth = 2.85" for 10-Year-2050 event Inflow = 1.00 cfs @ 12.07 hrs, Volume= 0.081 af Outflow = 0.91 cfs @ 12.10 hrs, Volume= 0.081 af, Atten= 9%, Lag= 2.0 min Discarded = 0.03 cfs @ 9.40 hrs, Volume= 0.035 af Primary = 0.88 cfs @ 12.10 hrs, Volume= 0.046 af Routed to Link 7 : Proposed Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 411.60' @ 12.10 hrs Surf.Area= 400 sf Storage= 229 cf Plug-Flow detention time= 13.9 min calculated for 0.081 af (100% of inflow) Center-of-Mass det. time= 13.9 min ( 774.2 - 760.3 ) Volume Invert Avail.Storage Storage Description #1 410.50' 329 cf 10.00'W x 40.00'L x 3.00'H STONE 1,200 cf Overall - 377 cf Embedded = 823 cf x 40.0% Voids #2 411.00' 377 cf 24.0" Round Pipe Storage x 3 Inside #1 L= 40.0' S= 0.0020 '/' 706 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 410.50' 2.900 in/hr Exfiltration over Surface area #2 Primary 411.00' 12.0" Round Culvert L= 14.0' Ke= 0.100 Inlet / Outlet Invert= 411.00' / 410.94' S= 0.0043 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf #3 Device 2 411.00' 8.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #4 Device 2 413.90' 24.0" x 24.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.03 cfs @ 9.40 hrs HW=410.54' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.88 cfs @ 12.10 hrs HW=411.60' (Free Discharge) 2=Culvert (Passes 0.88 cfs of 1.04 cfs potential flow)

(Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.88 cfs @ 12.10 hrs HW=411.60' (Free Discharge) 2=Culvert (Passes 0.88 cfs of 1.04 cfs potential flow) 3=Orifice (Orifice Controls 0.88 cfs @ 2.65 fps) 4=Grate ( Controls 0.00 cfs) 90

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Casey & Keller, Inc Printed 2/4/2026 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Pond 5: Pipes Hydrograph 1.00 cfs Inflow Outflow 0.91 cfs Inflow Area=0.343 ac Discarded Primary 1 Peak Elev=411.60' 0.88 cfs Storage=229 cf Flow (cfs) 0.03 cfs 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 91