Drainage Report

Basin 1 without exfiltration Proposed basin 1 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 1 without exfiltration Proposed basin 1 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 1 without exfiltration Proposed basin 1 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) 3.968 74 >75% Grass cover, Good, HSG C (28S, 32S) 4.445 98 Paved parking, HSG C (28S) 8.469 70 Woods, Good, HSG C (36S) 16.883 78 TOTAL AREA

Basin 1 without exfiltration Proposed basin 1 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 16.883 HSG C 28S, 32S, 36S 0.000 HSG D 0.000 Other 16.883 TOTAL AREA

Basin 1 without exfiltration Proposed basin 1 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 3.968 0.000 0.000 3.968 >75% Grass cover, Good 28S, 32S 0.000 0.000 4.445 0.000 0.000 4.445 Paved parking 28S 0.000 0.000 8.469 0.000 0.000 8.469 Woods, Good 36S 0.000 0.000 16.883 0.000 0.000 16.883 TOTAL AREA

Basin 1 without exfiltration Proposed basin 1 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 28S 0.00 0.00 873.0 0.0520 0.013 0.0 18.0 12.0

Basin 1 without exfiltration Proposed basin 1 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 28S: Basin 1 Runoff Area=314,926 sf Runoff Depth=2.43" Flow Length=1,759' Tc=30.2 min CN=74/98 Runoff=9.88 cfs 1.466 af Subcatchment 32S: Basin 1 Undetained Runoff Area=51,560 sf Runoff Depth=1.20" Flow Length=70' Slope=0.0800 '/' Tc=10.0 min CN=74/0 Runoff=1.36 cfs 0.118 af Subcatchment 36S: Basin 1 Predevelopment Runoff Area=368,926 sf Runoff Depth=0.97" Flow Length=1,360' Tc=31.9 min CN=70/0 Runoff=4.51 cfs 0.685 af Pond 29P: Basin 1 Peak Elev=542.84' Storage=63,856 cf Inflow=9.88 cfs 1.466 af Outflow=0.00 cfs 0.000 af Total Runoff Area = 16.883 ac Runoff Volume = 2.270 af Average Runoff Depth = 1.61"

Basin 1 without exfiltration Proposed basin 1 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 28S: Basin 1 [47] Hint: Peak is 251% of capacity of segment #4 Runoff = 9.88 cfs @ 12.42 hrs, Volume= 1.466 af, Depth= 2.43" Routed to Pond 29P : Basin 1 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 193,625 98 Paved parking, HSG C 121,301 74 >75% Grass cover, Good, HSG C 314,926 89 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 24.0 100 0.0050 0.07 Sheet Flow, grass Grass: Dense n= 0.240 P2= 3.44" 0.6 144 0.0690 3.94 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 3.7 642 0.0206 2.91 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 873 0.0520 7.62 3.93 Pipe Channel, 18.0" Round w/ 12.0" inside fill Area= 0.5 sf Perim= 3.3' r= 0.16' n= 0.013 Corrugated PE, smooth interior 30.2 1,759 Total

Basin 1 without exfiltration Proposed basin 1 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 28S: Basin 1 Hydrograph 11 Runoff 9.88 cfs 10 NOAA 24-hr D 9 2-Year Rainfall=3.44" 8 Runoff Area=314,926 sf 7 Runoff Volume=1.466 af Flow (cfs) 6 Runoff Depth=2.43" 5 Flow Length=1,759' 4 Tc=30.2 min 3 CN=74/98 2 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 1 without exfiltration Proposed basin 1 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 11 Hydrograph for Subcatchment 28S: Basin 1 Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.11 0.00 0.02 0.06 5.00 0.24 0.00 0.09 0.17 7.50 0.40 0.00 0.23 0.29 10.00 0.68 0.00 0.49 0.58 12.50 2.35 0.53 2.12 9.36 15.00 2.89 0.84 2.66 0.83 17.50 3.11 0.98 2.88 0.48 20.00 3.26 1.08 3.03 0.35 22.50 3.38 1.16 3.15 0.29 25.00 3.44 1.20 3.21 0.01 27.50 3.44 1.20 3.21 0.00 30.00 3.44 1.20 3.21 0.00 32.50 3.44 1.20 3.21 0.00 35.00 3.44 1.20 3.21 0.00 37.50 3.44 1.20 3.21 0.00 40.00 3.44 1.20 3.21 0.00 42.50 3.44 1.20 3.21 0.00 45.00 3.44 1.20 3.21 0.00 47.50 3.44 1.20 3.21 0.00 50.00 3.44 1.20 3.21 0.00 52.50 3.44 1.20 3.21 0.00 55.00 3.44 1.20 3.21 0.00 57.50 3.44 1.20 3.21 0.00 60.00 3.44 1.20 3.21 0.00 62.50 3.44 1.20 3.21 0.00 65.00 3.44 1.20 3.21 0.00 67.50 3.44 1.20 3.21 0.00 70.00 3.44 1.20 3.21 0.00