Drainage Report

45S Basin 2-4 pe-development 38S 43P Basin 2-4 pond 2-4 Subcat Reach Pond Link Routing Diagram for Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services, Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 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 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 3 Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 2-Year NOAA 24-hr D Default 24.00 1 3.44 2 2 10-Year NOAA 24-hr D Default 24.00 1 5.22 2 3 100-Year NOAA 24-hr D Default 24.00 1 8.66 2

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 4 Area Listing (all 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 70 Woods, Good, HSG C (45S) 4.409 77 TOTAL AREA

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 5 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 4.409 HSG C 38S, 45S 0.000 HSG D 0.000 Other 4.409 TOTAL AREA

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 6 Ground Covers (all 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 Woods, Good 45S 0.000 0.000 4.409 0.000 0.000 4.409 TOTAL AREA

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 7 Pipe Listing (all 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 without exfiltration Proposed Basin 2-4 R5 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 8 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 Subcatchment 45S: Basin 2-4 pe-development Runoff Area=96,036 sf Runoff Depth=0.97" Flow Length=390' Tc=18.0 min CN=70/0 Runoff=1.56 cfs 0.178 af Pond 43P: pond 2-4 Peak Elev=543.10' Storage=12,214 cf Inflow=3.93 cfs 0.354 af Outflow=0.11 cfs 0.121 af Total Runoff Area = 4.409 ac Runoff Volume = 0.532 af Average Runoff Depth = 1.45"

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 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 9 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 without exfiltration Proposed Basin 2-4 R5 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 10 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)