241220_42 ERW_Stormwater Report FULL

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 12HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach DP2-EX: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.423 ac, 0.00% Impervious, Inflow Depth = 1.20" for 2-Year event Inflow = 0.55 cfs @ 12.15 hrs, Volume= 0.042 af Outflow = 0.55 cfs @ 12.15 hrs, Volume= 0.042 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-EX: Inflow Outflow 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 Inflow Area=0.423 ac 0.55 cfs 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 13HydroCAD® 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=4.98"Subcatchment EDA-1 (IMPERV): Flow Length=275' Tc=2.8 min CN=98 Runoff=1.74 cfs 0.133 af Runoff Area=102,351 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment EDA-1 (PERV): Flow Length=501' Tc=13.1 min CN=74 Runoff=5.39 cfs 0.498 af Runoff Area=18,430 sf 0.00% Impervious Runoff Depth=2.54"Subcatchment EDA-2 (PERV.): Flow Length=121' Tc=7.2 min CN=74 Runoff=1.19 cfs 0.090 af Inflow=5.99 cfs 0.630 afReach DP1-EX: Outflow=5.99 cfs 0.630 af Inflow=1.19 cfs 0.090 afReach DP2-EX: Outflow=1.19 cfs 0.090 af Total Runoff Area = 3.092 ac Runoff Volume = 0.720 af Average Runoff Depth = 2.79" 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 14HydroCAD® 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 = 1.74 cfs @ 12.09 hrs, Volume= 0.133 af, Depth= 4.98" 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 10-Year Rainfall=5.22" 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 10-Year Rainfall=5.22" Runoff Area=13,913 sf Runoff Volume=0.133 af Runoff Depth=4.98" Flow Length=275' Tc=2.8 min CN=98 1.74 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 15HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-1 (PERV): Runoff = 5.39 cfs @ 12.21 hrs, Volume= 0.498 af, Depth= 2.54" 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 10-Year Rainfall=5.22" 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) 6 5 4 3 2 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=102,351 sf Runoff Volume=0.498 af Runoff Depth=2.54" Flow Length=501' Tc=13.1 min CN=74 5.39 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 16HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-2 (PERV.): Runoff = 1.19 cfs @ 12.15 hrs, Volume= 0.090 af, Depth= 2.54" 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 10-Year Rainfall=5.22" 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) 1 0 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=18,430 sf Runoff Volume=0.090 af Runoff Depth=2.54" Flow Length=121' Tc=7.2 min CN=74 1.19 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 17HydroCAD® 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 = 2.83" for 10-Year event Inflow = 5.99 cfs @ 12.20 hrs, Volume= 0.630 af Outflow = 5.99 cfs @ 12.20 hrs, Volume= 0.630 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) 6 5 4 3 2 1 0 Inflow Area=2.669 ac 5.99 cfs 5.99 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 18HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach DP2-EX: [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.423 ac, 0.00% Impervious, Inflow Depth = 2.54" for 10-Year event Inflow = 1.19 cfs @ 12.15 hrs, Volume= 0.090 af Outflow = 1.19 cfs @ 12.15 hrs, Volume= 0.090 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-EX: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.423 ac 1.19 cfs 1.19 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 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 19HydroCAD® 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=8.42"Subcatchment EDA-1 (IMPERV): Flow Length=275' Tc=2.8 min CN=98 Runoff=2.89 cfs 0.224 af Runoff Area=102,351 sf 0.00% Impervious Runoff Depth=5.52"Subcatchment EDA-1 (PERV): Flow Length=501' Tc=13.1 min CN=74 Runoff=11.62 cfs 1.081 af Runoff Area=18,430 sf 0.00% Impervious Runoff Depth=5.52"Subcatchment EDA-2 (PERV.): Flow Length=121' Tc=7.2 min CN=74 Runoff=2.54 cfs 0.195 af Inflow=12.64 cfs 1.305 afReach DP1-EX: Outflow=12.64 cfs 1.305 af Inflow=2.54 cfs 0.195 afReach DP2-EX: Outflow=2.54 cfs 0.195 af Total Runoff Area = 3.092 ac Runoff Volume = 1.500 af Average Runoff Depth = 5.82" 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 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 20HydroCAD® 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 = 2.89 cfs @ 12.09 hrs, Volume= 0.224 af, Depth= 8.42" 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 100-Year Rainfall=8.66" 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) 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=13,913 sf Runoff Volume=0.224 af Runoff Depth=8.42" Flow Length=275' Tc=2.8 min CN=98 2.89 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 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 21HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EDA-1 (PERV): Runoff = 11.62 cfs @ 12.21 hrs, Volume= 1.081 af, Depth= 5.52" 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 100-Year Rainfall=8.66" 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) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=102,351 sf Runoff Volume=1.081 af Runoff Depth=5.52" Flow Length=501' Tc=13.1 min CN=74 11.62 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.