1240815StormWaterManagementReportrcd 3 12 2026

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 1.66 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=7,658 sf Runoff Volume=0.125 af Flow (cfs) 1 Runoff Depth=8.55" Flow Length=92' Tc=1.0 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) 58

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 = 1.49 cfs @ 12.06 hrs, Volume= 0.110 af, Depth= 7.90" 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 100-Year-2020 Rainfall=9.18", P2=3.47" 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 1.38 Sheet Flow, 1 Smooth surfaces n= 0.011 P2= 3.47" 0.2 15 0.0670 1.59 Sheet Flow, 2 Smooth surfaces n= 0.011 P2= 3.47" 0.5 59 0.0500 1.86 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.2 10 0.0250 0.99 Sheet Flow, 4 Smooth surfaces n= 0.011 P2= 3.47" 1.0 92 Total 59

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 1.49 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" Runoff Area=7,266 sf 1 Runoff Volume=0.110 af Flow (cfs) Runoff Depth=7.90" Flow Length=92' Tc=1.0 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) 60

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 = 0.20 cfs @ 12.13 hrs, Volume= 0.015 af, Depth= 5.99" 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 100-Year-2020 Rainfall=9.18", P2=3.47" 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) 5.9 100 0.0650 0.28 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 0.1 28 0.0900 4.50 Shallow Concentrated Flow, 2 Grassed Waterway Kv= 15.0 fps 6.0 128 Total Subcatchment 6: Bypass Hydrograph Runoff 0.22 0.20 cfs 0.21 0.2 NOAA 24-hr D 0.19 0.18 100-Year-2020 Rainfall=9.18" 0.17 P2=3.47" 0.16 0.15 Runoff Area=1,318 sf 0.14

P2=3.47" 0.16 0.15 Runoff Area=1,318 sf 0.14 0.13 Runoff Volume=0.015 af Flow (cfs) 0.12 Runoff Depth=5.99" 0.11 0.1 Flow Length=128' 0.09 Tc=6.0 min 0.08 0.07 CN=74/0 0.06 0.05 0.04 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) 61

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 = 8.55" for 100-Year-2020 event Inflow = 1.66 cfs @ 12.06 hrs, Volume= 0.125 af Outflow = 0.78 cfs @ 12.15 hrs, Volume= 0.125 af, Atten= 53%, Lag= 5.5 min Discarded = 0.11 cfs @ 10.85 hrs, Volume= 0.096 af Primary = 0.67 cfs @ 12.15 hrs, Volume= 0.029 af Routed to Pond 5 : Pipes Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 415.32' @ 12.15 hrs Surf.Area= 1,620 sf Storage= 1,177 cf Plug-Flow detention time= 32.7 min calculated for 0.125 af (100% of inflow) Center-of-Mass det. time= 32.7 min ( 775.5 - 742.8 ) 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 @ 10.85 hrs HW=413.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.11 cfs) Primary OutFlow Max=0.67 cfs @ 12.15 hrs HW=415.31' (Free Discharge) 2=Culvert (Barrel Controls 0.67 cfs @ 3.42 fps) 62

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 1.66 cfs Inflow Outflow Inflow Area=0.176 ac Discarded Primary Peak Elev=415.32' Storage=1,177 cf 0.78 cfs Flow (cfs) 1 0.67 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) 63

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 = 4.88" for 100-Year-2020 event Inflow = 2.07 cfs @ 12.07 hrs, Volume= 0.139 af Outflow = 1.63 cfs @ 12.12 hrs, Volume= 0.139 af, Atten= 21%, Lag= 3.1 min Discarded = 0.03 cfs @ 7.70 hrs, Volume= 0.044 af Primary = 1.60 cfs @ 12.12 hrs, Volume= 0.096 af Routed to Link 7 : Proposed Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 412.24' @ 12.12 hrs Surf.Area= 400 sf Storage= 420 cf Plug-Flow detention time= 12.9 min calculated for 0.139 af (100% of inflow) Center-of-Mass det. time= 12.9 min ( 766.7 - 753.9 ) 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 @ 7.70 hrs HW=410.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=1.56 cfs @ 12.12 hrs HW=412.20' (Free Discharge) 2=Culvert (Passes 1.56 cfs of 3.03 cfs potential flow)

(Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=1.56 cfs @ 12.12 hrs HW=412.20' (Free Discharge) 2=Culvert (Passes 1.56 cfs of 3.03 cfs potential flow) 3=Orifice (Orifice Controls 1.56 cfs @ 4.48 fps) 4=Grate ( Controls 0.00 cfs) 64

512-516 Pleasant Valley Way, West Orange 1240815-pipes3-C NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" 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 2.07 cfs Inflow Outflow Inflow Area=0.343 ac Discarded Primary 2 1.63 cfs Peak Elev=412.24' 1.60 cfs Storage=420 cf Flow (cfs) 1 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) 65