Drainage Report

Basin 2-4 with exfiltration Proposed Basin 2-4 R3 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) 1.343 74 >75% Grass cover, Good, HSG C (38S) 0.607 98 Roofs, HSG C (38S) 0.255 98 Water Surface, 0% imp, HSG C (38S) 2.205 83 TOTAL AREA

Basin 2-4 with exfiltration Proposed Basin 2-4 R3 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 2.205 HSG C 38S 0.000 HSG D 0.000 Other 2.205 TOTAL AREA

Basin 2-4 with exfiltration Proposed Basin 2-4 R3 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 1.343 0.000 0.000 1.343 >75% Grass cover, Good 38S 0.000 0.000 0.607 0.000 0.000 0.607 Roofs 38S 0.000 0.000 0.255 0.000 0.000 0.255 Water Surface, 0% imp 38S 0.000 0.000 2.205 0.000 0.000 2.205 TOTAL AREA

Basin 2-4 with exfiltration Proposed Basin 2-4 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 38S 0.00 0.00 1,692.0 0.0390 0.010 0.0 15.0 10.0

Basin 2-4 with exfiltration Proposed Basin 2-4 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 38S: Basin 2-4 Runoff Area=96,037 sf Runoff Depth=1.93" Flow Length=1,912' Tc=10.1 min CN=78/98 Runoff=3.93 cfs 0.354 af Pond 43P: pond 2-4 Peak Elev=542.81' Storage=9,019 cf Inflow=3.93 cfs 0.354 af Discarded=0.14 cfs 0.354 af Primary=0.00 cfs 0.000 af Outflow=0.14 cfs 0.354 af Total Runoff Area = 2.205 ac Runoff Volume = 0.354 af Average Runoff Depth = 1.93"

Basin 2-4 with exfiltration Proposed Basin 2-4 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 38S: Basin 2-4 [47] Hint: Peak is 144% of capacity of segment #3 Runoff = 3.93 cfs @ 12.18 hrs, Volume= 0.354 af, Depth= 1.93" Routed to Pond 43P : pond 2-4 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 26,461 98 Roofs, HSG C 11,090 98 Water Surface, 0% imp, HSG C 58,486 74 >75% Grass cover, Good, HSG C 96,037 83 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.4 100 0.0800 0.31 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.9 120 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 3.7 1,692 0.0390 7.60 2.72 Pipe Channel, pipe to basin 15.0" Round w/ 10.0" inside fill Area= 0.4 sf Perim= 2.7' r= 0.13' n= 0.010 10.1 1,912 Total

Basin 2-4 with exfiltration Proposed Basin 2-4 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 Subcatchment 38S: Basin 2-4 Hydrograph Runoff 3.93 cfs 4 NOAA 24-hr D 2-Year Rainfall=3.44" 3 Runoff Area=96,037 sf Runoff Volume=0.354 af Flow (cfs) Runoff Depth=1.93" 2 Flow Length=1,912' Tc=10.1 min CN=78/98 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 2-4 with exfiltration Proposed Basin 2-4 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 Summary for Pond 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 1.93" for 2-Year event Inflow = 3.93 cfs @ 12.18 hrs, Volume= 0.354 af Outflow = 0.14 cfs @ 17.00 hrs, Volume= 0.354 af, Atten= 96%, Lag= 289.2 min Discarded = 0.14 cfs @ 17.00 hrs, Volume= 0.354 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= 542.81' @ 17.00 hrs Surf.Area= 11,090 sf Storage= 9,019 cf Plug-Flow detention time= 664.6 min calculated for 0.354 af (100% of inflow) Center-of-Mass det. time= 665.0 min ( 1,480.0 - 815.0 ) Volume Invert Avail.Storage Storage Description #1 542.00' 44,360 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 11,090 0 0 546.00 11,090 44,360 44,360 Device Routing Invert Outlet Devices #1 Discarded 542.00' 0.450 in/hr Exfiltration over Horizontal area Conductivity to Groundwater Elevation = 538.00' #2 Primary 542.90' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 543.40' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.14 cfs @ 17.00 hrs HW=542.81' (Free Discharge) 1=Exfiltration ( Controls 0.14 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=542.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)

Basin 2-4 with exfiltration Proposed Basin 2-4 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 11 Pond 43P: pond 2-4 Hydrograph Inflow 3.93 cfs Outflow Inflow Area=2.205 ac Discarded Primary 4 Peak Elev=542.81' Storage=9,019 cf 3 Flow (cfs) 2 1 0.14 cfs 0.14 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 2-5 2yr w/ exfiltration Proposed Basin 2-5 R5 infil 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