250701_42 ERW_Stormwater Report

250624_42 ERW Waymaker NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 10 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=2.72" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.55 cfs 0.039 af Inflow=0.55 cfs 0.039 af Outflow=0.55 cfs 0.039 af Total Runoff Area = 0.170 ac Runoff Volume = 0.039 af Average Runoff Depth = 2.72" 100.00% Pervious = 0.170 ac 0.00% Impervious = 0.000 ac

NOAA 24-hr D 10-Year Rainfall=5.22" 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 11 Summary for Subcatchment PR 2-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.55 cfs @ 12.11 hrs, Volume= Routed to Reach DP2-PR : 0.039 af, Depth= 2.72" 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 10-Year Rainfall=5.22" 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 0.6 0.55 cfs 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=7,405 sf Runoff Volume=0.039 af Runoff Depth=2.72" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 0.05 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 10-Year Rainfall=5.22" 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 12 Summary for Reach DP2-PR: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = Inflow = Outflow = 0.170 ac, 0.00% Impervious, Inflow Depth = 2.72" for 10-Year event 0.55 cfs @ 12.11 hrs, Volume= 0.039 af 0.55 cfs @ 12.11 hrs, Volume= 0.039 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 0.6 0.55 cfs 0.55 cfs 0.55 Inflow Outflow Inflow Area=0.170 ac 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)

250624_42 ERW Waymaker NOAA 24-hr D 25-Year Rainfall=6.44" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 13 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=3.76" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.76 cfs 0.053 af Inflow=0.76 cfs 0.053 af Outflow=0.76 cfs 0.053 af Total Runoff Area = 0.170 ac Runoff Volume = 0.053 af Average Runoff Depth = 3.76" 100.00% Pervious = 0.170 ac 0.00% Impervious = 0.000 ac

NOAA 24-hr D 25-Year Rainfall=6.44" 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 14 Summary for Subcatchment PR 2-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.76 cfs @ 12.11 hrs, Volume= Routed to Reach DP2-PR : 0.053 af, Depth= 3.76" 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 25-Year Rainfall=6.44" 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 0.8 0.76 cfs 0.75 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=7,405 sf Runoff Volume=0.053 af Runoff Depth=3.76" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 0.1 0.05 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 25-Year Rainfall=6.44" 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 15 Summary for Reach DP2-PR: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = Inflow = Outflow = 0.170 ac, 0.00% Impervious, Inflow Depth = 3.76" for 25-Year event 0.76 cfs @ 12.11 hrs, Volume= 0.053 af 0.76 cfs @ 12.11 hrs, Volume= 0.053 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 0.8 0.75 0.76 cfs 0.76 cfs Inflow Outflow Inflow Area=0.170 ac 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)

250624_42 ERW Waymaker NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 16 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=5.76" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=1.14 cfs 0.082 af Inflow=1.14 cfs 0.082 af Outflow=1.14 cfs 0.082 af Total Runoff Area = 0.170 ac Runoff Volume = 0.082 af Average Runoff Depth = 5.76" 100.00% Pervious = 0.170 ac 0.00% Impervious = 0.000 ac

NOAA 24-hr D 100-Year Rainfall=8.66" 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 17 Summary for Subcatchment PR 2-P: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.14 cfs @ 12.11 hrs, Volume= Routed to Reach DP2-PR : 0.082 af, Depth= 5.76" 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 100-Year Rainfall=8.66" 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 1.14 cfs Flow (cfs) 1 0 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=7,405 sf Runoff Volume=0.082 af Runoff Depth=5.76" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 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 100-Year Rainfall=8.66" 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 18 Summary for Reach DP2-PR: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = Inflow = Outflow = 0.170 ac, 0.00% Impervious, Inflow Depth = 5.76" for 100-Year event 1.14 cfs @ 12.11 hrs, Volume= 0.082 af 1.14 cfs @ 12.11 hrs, Volume= 0.082 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 1.14 cfs 1.14 cfs Inflow Outflow Inflow Area=0.170 ac Flow (cfs) 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)

250624_42 ERW Waymaker NJ DEP 2-hr WQ Rainfall=1.25" Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Printed 7/1/2025 Page 19 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=0.10" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.04 cfs 0.001 af Inflow=0.04 cfs 0.001 af Outflow=0.04 cfs 0.001 af Total Runoff Area = 0.170 ac Runoff Volume = 0.001 af Average Runoff Depth = 0.10" 100.00% Pervious = 0.170 ac 0.00% Impervious = 0.000 ac