Drainage Report

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 5 Ground Covers (selected nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.560 0.000 0.000 0.560 >75% Grass cover, Good 16S 0.000 0.000 0.000 0.000 1.408 1.408 roof and parking 16S 0.000 0.000 0.560 0.000 1.408 1.968 TOTAL AREA

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 6 Pipe Listing (selected nodes) Line# Node In-Invert Out-Invert Length Slope n Width Diam/Height Inside-Fill Node Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) Name 1 16S 0.00 0.00 309.0 0.0261 0.013 0.0 15.0 9.0

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 7 Time span=0.00-72.00 hrs, dt=0.03 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 16S: Basin 4 Porous pvmt Runoff Area=85,708 sf Runoff Depth=2.64" Flow Length=509' Tc=8.1 min CN=74/98 Runoff=4.96 cfs 0.432 af Pond 17P: Porous pavement system 4 Peak Elev=588.20' Storage=13,655 cf Inflow=4.96 cfs 0.432 af Discarded=0.07 cfs 0.409 af Primary=0.00 cfs 0.000 af Outflow=0.07 cfs 0.409 af Total Runoff Area = 1.968 ac Runoff Volume = 0.432 af Average Runoff Depth = 2.64"

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 16S: Basin 4 Porous pvmt [47] Hint: Peak is 202% of capacity of segment #3 Runoff = 4.96 cfs @ 12.15 hrs, Volume= 0.432 af, Depth= 2.64" Routed to Pond 17P : Porous pavement system 4 Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.03 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description * 61,324 98 roof and parking 24,384 74 >75% Grass cover, Good, HSG C 85,708 91 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0520 0.26 Sheet Flow, grass Grass: Short n= 0.150 P2= 3.44" 0.6 100 0.0300 2.60 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.0 309 0.0261 5.35 2.45 Pipe Channel, 15.0" Round w/ 9.0" inside fill Area= 0.5 sf Perim= 2.9' r= 0.16' n= 0.013 Corrugated PE, smooth interior 8.1 509 Total Subcatchment 16S: Basin 4 Porous pvmt Hydrograph Runoff 4.96 cfs

Runoff 4.96 cfs 5 NOAA 24-hr D 2-Year Rainfall=3.44" 4 Runoff Area=85,708 sf Runoff Volume=0.432 af Flow (cfs) 3 Runoff Depth=2.64" Flow Length=509' 2 Tc=8.1 min CN=74/98 1 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)

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 9 Summary for Pond 17P: Porous pavement system 4 Inflow Area = 1.968 ac, Inflow Depth = 2.64" for 2-Year event Inflow = 4.96 cfs @ 12.15 hrs, Volume= 0.432 af Outflow = 0.07 cfs @ 23.24 hrs, Volume= 0.409 af, Atten= 99%, Lag= 665.3 min Discarded = 0.07 cfs @ 23.24 hrs, Volume= 0.409 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 588.20' @ 23.24 hrs Surf.Area= 10,178 sf Storage= 13,655 cf Plug-Flow detention time= 1,551.5 min calculated for 0.409 af (95% of inflow) Center-of-Mass det. time= 1,520.0 min ( 2,293.4 - 773.3 ) Volume Invert Avail.Storage Storage Description #1 585.00' 32,044 cf Custom Stage Data (Prismatic) Listed below (Recalc) 81,424 cf Overall - 1,315 cf Embedded = 80,109 cf x 40.0% Voids #2 586.00' 1,315 cf 36.0" Round Pipe Storage Inside #1 L= 186.0' 33,358 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 585.00 10,178 0 0 593.00 10,178 81,424 81,424 Device Routing Invert Outlet Devices #1 Discarded 585.00' 0.310 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = -7.00' #2 Primary 588.95' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 589.90' 24.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.07 cfs @ 23.24 hrs HW=588.20' (Free Discharge) 1=Exfiltration ( Controls 0.07 cfs) Primary

C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.07 cfs @ 23.24 hrs HW=588.20' (Free Discharge) 1=Exfiltration ( Controls 0.07 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=585.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)

basin 4 with exfiltration Proposed basin 4 R4 with exfiltration NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 10 Pond 17P: Porous pavement system 4 Hydrograph Inflow 4.96 cfs Outflow Inflow Area=1.968 ac Discarded Primary 5 Peak Elev=588.20' Storage=13,655 cf 4 Flow (cfs) 3 2 1 0.07 cfs 0.07 cfs 0.00 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)

Basin 5 w/ exfiltration Proposed basin 5 R5 infilt Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 1 Project Notes Rainfall events imported from "NRCS-Rain.txt" for 6606 NJ Essex-D

Basin 5 w/ exfiltration Proposed basin 5 R5 infilt NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 2 Summary for Pond 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 2.46" for 2-Year event Inflow = 4.83 cfs @ 12.19 hrs, Volume= 0.466 af Outflow = 0.10 cfs @ 21.56 hrs, Volume= 0.466 af, Atten= 98%, Lag= 562.6 min Discarded = 0.10 cfs @ 21.56 hrs, Volume= 0.466 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 571.63' @ 21.56 hrs Surf.Area= 12,410 sf Storage= 13,994 cf Plug-Flow detention time= 1,329.6 min calculated for 0.466 af (100% of inflow) Center-of-Mass det. time= 1,330.2 min ( 2,112.3 - 782.2 ) Volume Invert Avail.Storage Storage Description #1 570.50' 43,435 cf Custom Stage Data (Conic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 570.50 12,410 0 0 12,410 574.00 12,410 43,435 43,435 13,792 Device Routing Invert Outlet Devices #1 Discarded 570.50' 0.320 in/hr Exfiltration over Wetted area Conductivity to Groundwater Elevation = -2.00' #2 Primary 572.40' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.10 cfs @ 21.56 hrs HW=571.63' (Free Discharge) 1=Exfiltration ( Controls 0.10 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=570.50' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs)