Drainage Report

Basin 1 2yr infiltration Proposed basin 1 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

Basin 1 2yr infiltration Proposed basin 1 R5 infil 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 Subcatchment 32S: Basin 1 Undetained Runoff = 1.36 cfs @ 12.18 hrs, Volume= 0.118 af, Depth= 1.20" 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 51,560 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 70 0.0800 0.20 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 5.9 70 Total, Increased to minimum Tc = 10.0 min Subcatchment 32S: Basin 1 Undetained Hydrograph Runoff 1.36 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=51,560 sf 1 Runoff Volume=0.118 af Flow (cfs) Runoff Depth=1.20" Flow Length=70'

Runoff Depth=1.20" Flow Length=70' Slope=0.0800 '/' Tc=10.0 min CN=74/0 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 2-1 eith exfil WQ Proposed Basin 2-1 R3 Prepared by Anderson Consulting Services Printed 10/23/2023 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 2-1 eith exfil WQ Proposed Basin 2-1 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 2 Summary for Pond 41P: Pond 2-1 Inflow Area = 0.599 ac, Inflow Depth = 1.36" for 2-Year event Inflow = 0.79 cfs @ 12.18 hrs, Volume= 0.068 af Outflow = 0.02 cfs @ 19.47 hrs, Volume= 0.068 af, Atten= 97%, Lag= 437.2 min Discarded = 0.02 cfs @ 19.47 hrs, Volume= 0.068 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= 546.93' @ 19.47 hrs Surf.Area= 2,020 sf Storage= 1,883 cf Plug-Flow detention time= 848.3 min calculated for 0.068 af (100% of inflow) Center-of-Mass det. time= 848.0 min ( 1,709.6 - 861.6 ) Volume Invert Avail.Storage Storage Description #1 546.00' 4,040 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 546.00 2,020 0 0 548.00 2,020 4,040 4,040 Device Routing Invert Outlet Devices #1 Discarded 546.00' 0.450 in/hr Exfiltration over Horizontal area Conductivity to Groundwater Elevation = 538.00' #2 Primary 546.95' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 547.20' 10.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.02 cfs @ 19.47 hrs HW=546.93' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=546.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)

basin 2-1 eith exfil WQ Proposed Basin 2-1 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 3 Pond 41P: Pond 2-1 Hydrograph Inflow 0.79 cfs Outflow Inflow Area=0.599 ac Discarded Primary 0.85 0.8 Peak Elev=546.93' 0.75 0.7 Storage=1,883 cf 0.65 0.6 0.55 Flow (cfs) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.02 cfs 0.1 0.02 cfs 0.05 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)

36S 42P Basin 2-2 Pond 2-2 Subcat Reach Pond Link Routing Diagram for Proposed Basin 2-2 R3 Prepared by Anderson Consulting Services, Printed 10/23/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC

Basin 2-2 with exfil Proposed Basin 2-2 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

Basin 2-2 with exfil Proposed Basin 2-2 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) 0.454 74 >75% Grass cover, Good, HSG C (36S) 0.794 98 Paved parking, HSG C (36S) 0.163 98 Water Surface, 0% imp, HSG C (36S) 1.412 90 TOTAL AREA

Basin 2-2 with exfil Proposed Basin 2-2 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 1.412 HSG C 36S 0.000 HSG D 0.000 Other 1.412 TOTAL AREA