250701_42 ERW_Stormwater Report

Appendix A HydroCAD Output Stormwater Management Report | October 18, 2024 – Revised December 20, 2024

PR 2-P DP2-PR Subcat Reach Pond Link Routing Diagram for 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design, Printed 7/1/2025 HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC

250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Project Notes Rainfall events imported from "NRCS2-Rain.txt" for 1167 NJ Essex-D Rainfall events imported from "NRCS2-Rain.txt" for 1167 NJ Essex-D Rainfall events imported from "NRCS2-Rain.txt" for 1167 NJ Essex-D Printed 7/1/2025 Page 2

250624_42 ERW Waymaker Printed 7/1/2025 Page 3 Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# 1 2 3 4 5 6 Event Name Storm Type Curve Mode Duration (hours) B/B 2-Year 10-Year 25-Year 100-Year WQ 50-Year NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr NJ DEP 2-hr NOAA 24-hr D D D D Default Default Default Default Default Default 24.00 24.00 24.00 24.00 2.00 24.00 1 1 1 1 1 1 D Depth (inches) 3.44 5.22 6.44 8.66 1.25 7.49 AMC 2 2 2 2 2 2

250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.148 0.022 0.170 74 89 76 >75% Grass cover, Good, HSG C (PR 2-P) Gravel roads, HSG C (PR 2-P) TOTAL AREA Printed 7/1/2025 Page 4

250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 0.000 0.170 0.000 0.000 0.170 HSG A HSG B HSG C HSG D Other PR 2-P TOTAL AREA Printed 7/1/2025 Page 5

250624_42 ERW Waymaker Printed 7/1/2025 Page 6 Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c 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 0.148 0.000 0.000 0.148 0.000 0.000 0.022 0.000 0.000 0.022 0.000 0.000 0.170 0.000 0.000 0.170 >75% Grass cover, Good PR 2-P Gravel roads PR 2-P TOTAL AREA

250624_42 ERW Waymaker NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 7 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 Subcatchment PR 2-P: Reach DP2-PR: Runoff Area=7,405 sf 0.00% Impervious Runoff Depth=1.32" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.26 cfs 0.019 af Inflow=0.26 cfs 0.019 af Outflow=0.26 cfs 0.019 af Total Runoff Area = 0.170 ac Runoff Volume = 0.019 af Average Runoff Depth = 1.32" 100.00% Pervious = 0.170 ac 0.00% Impervious = 0.000 ac

NOAA 24-hr D 2-Year Rainfall=3.44" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 8 Summary for Subcatchment PR 2-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.26 cfs @ 12.11 hrs, Volume= Routed to Reach DP2-PR : 0.019 af, Depth= 1.32" 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) 6,447 958 7,405 7,405 CN 74 89 76 Description >75% Grass cover, Good, HSG C Gravel roads, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.6 84 0.0833 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" Subcatchment PR 2-P: Hydrograph Runoff 0.28 0.26 cfs 0.26 0.24 0.22 0.2 Flow (cfs) 0.18 0.16 0.14 0.12 0.1 0.08 0.06 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=7,405 sf Runoff Volume=0.019 af Runoff Depth=1.32" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 0.04 0.02 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)

NOAA 24-hr D 2-Year Rainfall=3.44" 250624_42 ERW Waymaker Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 9 Summary for Reach DP2-PR: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = Inflow = Outflow = 0.170 ac, 0.00% Impervious, Inflow Depth = 1.32" for 2-Year event 0.26 cfs @ 12.11 hrs, Volume= 0.019 af 0.26 cfs @ 12.11 hrs, Volume= 0.019 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 DP2-PR: Hydrograph 0.28 0.26 0.26 cfs 0.26 cfs Inflow Outflow Inflow Area=0.170 ac 0.24 0.22 0.2 Flow (cfs) 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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)