Drainage Report

Basin 2-3 with exfiltration Proposed Basin 2-3 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 2.259 HSG C 40S 0.000 HSG D 0.000 Other 2.259 TOTAL AREA

Basin 2-3 with exfiltration Proposed Basin 2-3 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 0.959 0.000 0.000 0.959 >75% Grass cover, Good 40S 0.000 0.000 1.060 0.000 0.000 1.060 Roofs 40S 0.000 0.000 0.239 0.000 0.000 0.239 Water Surface, 0% imp 40S 0.000 0.000 2.259 0.000 0.000 2.259 TOTAL AREA

Basin 2-3 with exfiltration Proposed Basin 2-3 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 40S 0.00 0.00 1,326.0 0.0300 0.010 0.0 15.0 0.0

Basin 2-3 with exfiltration Proposed Basin 2-3 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 40S: Basin 2-3 Runoff Area=98,395 sf Runoff Depth=2.30" Flow Length=1,558' Tc=10.5 min CN=79/98 Runoff=4.65 cfs 0.434 af Pond 44P: pond 2-3 Peak Elev=543.12' Storage=11,645 cf Inflow=4.65 cfs 0.434 af Discarded=0.14 cfs 0.434 af Primary=0.00 cfs 0.000 af Outflow=0.14 cfs 0.434 af Total Runoff Area = 2.259 ac Runoff Volume = 0.434 af Average Runoff Depth = 2.30"

Basin 2-3 with exfiltration Proposed Basin 2-3 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 40S: Basin 2-3 Runoff = 4.65 cfs @ 12.18 hrs, Volume= 0.434 af, Depth= 2.30" Routed to Pond 44P : pond 2-3 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 41,793 74 >75% Grass cover, Good, HSG C 46,190 98 Roofs, HSG C 10,412 98 Water Surface, 0% imp, HSG C 98,395 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 100 0.0300 0.21 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.4 60 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.2 72 0.0800 5.74 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 1,326 0.0300 11.85 14.55 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 10.5 1,558 Total

Basin 2-3 with exfiltration Proposed Basin 2-3 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 Subcatchment 40S: Basin 2-3 Hydrograph Runoff 5 4.65 cfs NOAA 24-hr D 4 2-Year Rainfall=3.44" Runoff Area=98,395 sf Runoff Volume=0.434 af 3 Flow (cfs) Runoff Depth=2.30" Flow Length=1,558' 2 Tc=10.5 min CN=79/98 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 2-3 with exfiltration Proposed Basin 2-3 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 Summary for Pond 44P: pond 2-3 Inflow Area = 2.259 ac, Inflow Depth = 2.30" for 2-Year event Inflow = 4.65 cfs @ 12.18 hrs, Volume= 0.434 af Outflow = 0.14 cfs @ 17.51 hrs, Volume= 0.434 af, Atten= 97%, Lag= 320.0 min Discarded = 0.14 cfs @ 17.51 hrs, Volume= 0.434 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= 543.12' @ 17.51 hrs Surf.Area= 10,412 sf Storage= 11,645 cf Plug-Flow detention time= 836.6 min calculated for 0.434 af (100% of inflow) Center-of-Mass det. time= 836.2 min ( 1,630.8 - 794.6 ) Volume Invert Avail.Storage Storage Description #1 542.00' 41,648 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 10,412 0 0 546.00 10,412 41,648 41,648 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 543.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 543.75' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.14 cfs @ 17.51 hrs HW=543.12' (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 2-3 with exfiltration Proposed Basin 2-3 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 11 Pond 44P: pond 2-3 Hydrograph Inflow 4.65 cfs Outflow Inflow Area=2.259 ac Discarded Primary 5 Peak Elev=543.12' 4 Storage=11,645 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)

38S 43P Basin 2-4 pond 2-4 Subcat Reach Pond Link Routing Diagram for 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

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