241220_42 ERW_Stormwater Report FULL

240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 2HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Project Notes Rainfall events imported from "NRCS2-Rain.txt" for 1167 NJ Essex-D This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 3HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 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 4 WQ NJ DEP 2-hr Default 2.00 1 1.25 2 This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 4HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 2.773 74 >75% Grass cover, Good, HSG C (EDA-1 (PERV), EDA-2 (PERV.)) 0.319 98 Paved parking, HSG C (EDA-1 (IMPERV)) 3.092 76 TOTAL AREA This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 5HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 3.092 HSG C EDA-1 (IMPERV), EDA-1 (PERV), EDA-2 (PERV.) 0.000 HSG D 0.000 Other 3.092 TOTAL AREA This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 6HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 2.773 0.000 0.000 2.773 >75% Grass cover, Good EDA-1 (PERV), EDA-2 (PERV.) 0.000 0.000 0.319 0.000 0.000 0.319 Paved parking EDA-1 (IMPERV) 0.000 0.000 3.092 0.000 0.000 3.092 TOTAL AREA This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 7HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=13,913 sf 100.00% Impervious Runoff Depth=3.21"Subcatchment EDA-1 (IMPERV): Flow Length=275' Tc=2.8 min CN=98 Runoff=1.14 cfs 0.085 af Runoff Area=102,351 sf 0.00% Impervious Runoff Depth=1.20"Subcatchment EDA-1 (PERV): Flow Length=501' Tc=13.1 min CN=74 Runoff=2.46 cfs 0.235 af Runoff Area=18,430 sf 0.00% Impervious Runoff Depth=1.20"Subcatchment EDA-2 (PERV.): Flow Length=121' Tc=7.2 min CN=74 Runoff=0.55 cfs 0.042 af Inflow=2.85 cfs 0.320 afReach DP1-EX: Outflow=2.85 cfs 0.320 af Inflow=0.55 cfs 0.042 afReach DP2-EX: Outflow=0.55 cfs 0.042 af Total Runoff Area = 3.092 ac Runoff Volume = 0.362 af Average Runoff Depth = 1.41" 89.67% Pervious = 2.773 ac 10.33% Impervious = 0.319 ac This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 8HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-1 (IMPERV): [49] Hint: Tc<2dt may require smaller dt Runoff = 1.14 cfs @ 12.09 hrs, Volume= 0.085 af, Depth= 3.21" Routed to Reach DP1-EX : Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 13,913 98 Paved parking, HSG C 13,913 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 78 0.0150 1.21 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 1.0 12 0.0800 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.7 185 0.0830 4.64 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.8 275 Total Subcatchment EDA-1 (IMPERV): Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=13,913 sf Runoff Volume=0.085 af Runoff Depth=3.21" Flow Length=275' Tc=2.8 min CN=98 1.14 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 9HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-1 (PERV): Runoff = 2.46 cfs @ 12.22 hrs, Volume= 0.235 af, Depth= 1.20" Routed to Reach DP1-EX : Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 102,351 74 >75% Grass cover, Good, HSG C 102,351 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.9 100 0.0140 0.15 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 2.2 401 0.0350 3.01 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 13.1 501 Total Subcatchment EDA-1 (PERV): Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=102,351 sf Runoff Volume=0.235 af Runoff Depth=1.20" Flow Length=501' Tc=13.1 min CN=74 2.46 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 10HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-2 (PERV.): Runoff = 0.55 cfs @ 12.15 hrs, Volume= 0.042 af, Depth= 1.20" Routed to Reach DP2-EX : Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description 18,430 74 >75% Grass cover, Good, HSG C 18,430 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 100 0.0410 0.24 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.1 21 0.1050 5.22 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.2 121 Total Subcatchment EDA-2 (PERV.): Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=18,430 sf Runoff Volume=0.042 af Runoff Depth=1.20" Flow Length=121' Tc=7.2 min CN=74 0.55 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 11HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach DP1-EX: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.669 ac, 11.97% Impervious, Inflow Depth = 1.44" for 2-Year event Inflow = 2.85 cfs @ 12.20 hrs, Volume= 0.320 af Outflow = 2.85 cfs @ 12.20 hrs, Volume= 0.320 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach DP1-EX: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 3 2 1 0 Inflow Area=2.669 ac 2.85 cfs 2.85 cfs This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.