Drainage Report

Basin 3 Proposed basin 3 R3 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 34S 0.00 0.00 450.0 0.0600 0.013 0.0 15.0 8.0

Basin 3 Proposed basin 3 R3 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=0.05 hrs, 1441 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 34S: Basin 3 Runoff Area=95,425 sf Runoff Depth=1.88" Flow Length=670' Tc=10.0 min CN=74/98 Runoff=3.73 cfs 0.343 af Pond 35P: Basin 3 Peak Elev=530.15' Storage=11,078 cf Inflow=3.73 cfs 0.343 af Discarded=0.07 cfs 0.301 af Primary=0.00 cfs 0.000 af Outflow=0.07 cfs 0.301 af Total Runoff Area = 2.191 ac Runoff Volume = 0.343 af Average Runoff Depth = 1.88"

Basin 3 Proposed basin 3 R3 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 34S: Basin 3 Runoff = 3.73 cfs @ 12.17 hrs, Volume= 0.343 af, Depth= 1.88" Routed to Pond 35P : Basin 3 Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 32,412 98 Paved parking, HSG C 63,013 74 >75% Grass cover, Good, HSG C 95,425 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.9 100 0.0800 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 0.1 20 0.0800 4.24 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.4 100 0.0500 4.54 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.8 450 0.0600 8.91 5.00 Pipe Channel, 15.0" Round w/ 8.0" inside fill Area= 0.6 sf Perim= 3.1' r= 0.18' n= 0.013 Concrete sewer w/manholes & inlets 9.2 670 Total, Increased to minimum Tc = 10.0 min Subcatchment 34S: Basin 3 Hydrograph

Subcatchment 34S: Basin 3 Hydrograph Runoff 4 3.73 cfs NOAA 24-hr D 2-Year Rainfall=3.44" 3 Runoff Area=95,425 sf Runoff Volume=0.343 af Flow (cfs) Runoff Depth=1.88" 2 Flow Length=670' Tc=10.0 min 1 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)

Basin 3 Proposed basin 3 R3 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 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 1.88" for 2-Year event Inflow = 3.73 cfs @ 12.17 hrs, Volume= 0.343 af Outflow = 0.07 cfs @ 23.32 hrs, Volume= 0.301 af, Atten= 98%, Lag= 669.0 min Discarded = 0.07 cfs @ 23.32 hrs, Volume= 0.301 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= 0.05 hrs Peak Elev= 530.15' @ 23.32 hrs Surf.Area= 6,907 sf Storage= 11,078 cf Plug-Flow detention time= 1,464.2 min calculated for 0.301 af (88% of inflow) Center-of-Mass det. time= 1,401.5 min ( 2,209.7 - 808.2 ) Volume Invert Avail.Storage Storage Description #1 528.00' 26,911 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 528.00 3,437 0 0 530.00 6,648 10,085 10,085 532.00 10,178 16,826 26,911 Device Routing Invert Outlet Devices #1 Discarded 528.00' 0.370 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 520.00' #2 Primary 530.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 530.60' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.07 cfs @ 23.32 hrs HW=530.15' (Free Discharge) 1=Exfiltration ( Controls 0.07 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=528.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)

Basin 3 Proposed basin 3 R3 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 35P: Basin 3 Hydrograph Inflow 3.73 cfs Outflow Inflow Area=2.191 ac Discarded Primary 4 Peak Elev=530.15' Storage=11,078 cf 3 Flow (cfs) 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)

16S Basin 4 Porous pvmt 17P Porous pavement system 4 Subcat Reach Pond Link Routing Diagram for 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

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 2 Project Notes Rainfall events imported from "NRCS-Rain.txt" for 6606 NJ Essex-D

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 3 Area Listing (selected nodes) Area CN Description (acres) (subcatchment-numbers) 0.560 74 >75% Grass cover, Good, HSG C (16S) 1.408 98 roof and parking (16S) 1.968 91 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 4 Soil Listing (selected nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.560 HSG C 16S 0.000 HSG D 1.408 Other 16S 1.968 TOTAL AREA