241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 41HydroCAD® 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=13,167 sf 0.00% Impervious Runoff Depth=6.00"Subcatchment PDA-1A (PERV): (new Subcat) Flow Length=203' Tc=5.9 min CN=78 Runoff=2.01 cfs 0.151 af Runoff Area=25,145 sf 100.00% Impervious Runoff Depth=8.42"Subcatchment PDA-1B (IMPERV): (new Flow Length=136' Tc=1.5 min CN=98 Runoff=5.25 cfs 0.405 af Runoff Area=58,772 sf 0.00% Impervious Runoff Depth=6.13"Subcatchment PDA-1B(PERV): (new Subcat) Flow Length=180' Tc=7.5 min CN=79 Runoff=8.79 cfs 0.689 af Runoff Area=11,760 sf 100.00% Impervious Runoff Depth=8.42"Subcatchment PDA-1C(IMPERV): (new Tc=1.0 min CN=98 Runoff=2.47 cfs 0.189 af Runoff Area=18,423 sf 0.00% Impervious Runoff Depth=6.00"Subcatchment PDA-1C(PERV): (new Subcat) Flow Length=123' Tc=7.2 min CN=78 Runoff=2.73 cfs 0.212 af Runoff Area=7,411 sf 0.00% Impervious Runoff Depth=5.76"Subcatchment PDA-2 (PERV.): (new Subcat) Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=1.14 cfs 0.082 af Inflow=9.24 cfs 1.550 afReach DP1-P: (new Reach) Outflow=9.24 cfs 1.550 af Inflow=1.14 cfs 0.082 afReach DP2-P: (new Reach) Outflow=1.14 cfs 0.082 af Inflow=12.54 cfs 1.094 afReach PDA-1B: (new Reach) Outflow=12.54 cfs 1.094 af Inflow=4.58 cfs 0.401 afReach PDA-1C: (new Reach) Outflow=4.58 cfs 0.401 af Peak Elev=18.25' Storage=0.412 af Inflow=12.54 cfs 1.094 afPond Basin 1: (new Pond) Outflow=5.92 cfs 1.026 af Peak Elev=17.46' Storage=0.065 af Inflow=4.58 cfs 0.401 afPond Basin 2: (new Pond) Outflow=4.52 cfs 0.373 af Total Runoff Area = 3.092 ac Runoff Volume = 1.728 af Average Runoff Depth = 6.71" 72.60% Pervious = 2.245 ac 27.40% Impervious = 0.847 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 42HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1A (PERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 2.01 cfs @ 12.13 hrs, Volume= 0.151 af, Depth= 6.00" Routed to Reach DP1-P : (new Reach) 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 9,975 74 >75% Grass cover, Good, HSG C 3,192 89 Gravel roads, HSG C 13,167 78 Weighted Average 13,167 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 100 0.0725 0.30 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 103 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.9 203 Total Subcatchment PDA-1A (PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=13,167 sf Runoff Volume=0.151 af Runoff Depth=6.00" Flow Length=203' Tc=5.9 min CN=78 2.01 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 43HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1B (IMPERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 5.25 cfs @ 12.07 hrs, Volume= 0.405 af, Depth= 8.42" Routed to Reach PDA-1B : (new Reach) 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 9,688 98 Roofs, HSG C 15,457 98 Paved parking, HSG C 25,145 98 Weighted Average 25,145 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.2 100 0.0200 1.43 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 0.3 36 0.0139 2.39 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.5 136 Total Subcatchment PDA-1B (IMPERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=25,145 sf Runoff Volume=0.405 af Runoff Depth=8.42" Flow Length=136' Tc=1.5 min CN=98 5.25 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 44HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1B(PERV): (new Subcat) Runoff = 8.79 cfs @ 12.14 hrs, Volume= 0.689 af, Depth= 6.13" Routed to Reach PDA-1B : (new Reach) 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 39,275 74 >75% Grass cover, Good, HSG C 19,497 89 Gravel roads, HSG C 58,772 79 Weighted Average 58,772 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.0400 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.3 80 0.0812 4.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.5 180 Total Subcatchment PDA-1B(PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 9 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=58,772 sf Runoff Volume=0.689 af Runoff Depth=6.13" Flow Length=180' Tc=7.5 min CN=79 8.79 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 45HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1C(IMPERV): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 2.47 cfs @ 12.06 hrs, Volume= 0.189 af, Depth= 8.42" Routed to Reach PDA-1C : (new Reach) 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 11,760 98 Roofs, HSG C 11,760 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment PDA-1C(IMPERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=11,760 sf Runoff Volume=0.189 af Runoff Depth=8.42" Tc=1.0 min CN=98 2.47 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 46HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-1C(PERV): (new Subcat) Runoff = 2.73 cfs @ 12.14 hrs, Volume= 0.212 af, Depth= 6.00" Routed to Reach PDA-1C : (new Reach) 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 4,377 89 Gravel roads, HSG C 14,046 74 >75% Grass cover, Good, HSG C 18,423 78 Weighted Average 18,423 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 100 0.0425 0.24 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.2 23 0.0100 1.61 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.2 123 Total Subcatchment PDA-1C(PERV): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=18,423 sf Runoff Volume=0.212 af Runoff Depth=6.00" Flow Length=123' Tc=7.2 min CN=78 2.73 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 47HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PDA-2 (PERV.): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 1.14 cfs @ 12.11 hrs, Volume= 0.082 af, Depth= 5.76" Routed to Reach DP2-P : (new Reach) 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 6,431 74 >75% Grass cover, Good, HSG C 980 89 Gravel roads, HSG C 7,411 76 Weighted Average 7,411 100.00% 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 PDA-2 (PERV.): (new Subcat) Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=7,411 sf Runoff Volume=0.082 af Runoff Depth=5.76" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 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 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 48HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach DP1-P: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.922 ac, 29.00% Impervious, Inflow Depth = 6.37" for 100-Year event Inflow = 9.24 cfs @ 12.22 hrs, Volume= 1.550 af Outflow = 9.24 cfs @ 12.22 hrs, Volume= 1.550 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-P: (new Reach) Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.922 ac 9.24 cfs 9.24 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 49HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach DP2-P: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.170 ac, 0.00% Impervious, Inflow Depth = 5.76" for 100-Year event Inflow = 1.14 cfs @ 12.11 hrs, Volume= 0.082 af Outflow = 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-P: (new Reach) Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 Inflow Area=0.170 ac 1.14 cfs 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 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 50HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach PDA-1B: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.926 ac, 29.96% Impervious, Inflow Depth = 6.81" for 100-Year event Inflow = 12.54 cfs @ 12.10 hrs, Volume= 1.094 af Outflow = 12.54 cfs @ 12.10 hrs, Volume= 1.094 af, Atten= 0%, Lag= 0.0 min Routed to Pond Basin 1 : (new Pond) Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach PDA-1B: (new Reach) Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.926 ac 12.54 cfs 12.54 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.