241220_42 ERW_Stormwater Report FULL

NOAA 24-hr D 10-Year Rainfall=5.22"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 22HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach 10R: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.619 ac 9.28 cfs 9.28 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 23HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach DP1-PR: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 4 3 2 1 0 Inflow Area=2.922 ac 4.42 cfs 4.42 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 24HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach DP2-PR: 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=0.170 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 25HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond BASIN: - Chamber Wizard Field A Chamber Model = ADS_StormTech MC-3500 d +Cap (ADS StormTech® MC-3500 d rev 03/14 with Cap volume) Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap Cap Storage= 14.9 cf x 2 x 5 rows = 149.0 cf 77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing 19 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 139.93' Row Length +12.0" End Stone x 2 = 141.93' Base Length 5 Rows x 77.0" Wide + 9.0" Spacing x 4 + 18.0" Side Stone x 2 = 38.08' Base Width 9.0" Stone Base + 45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height 95 Chambers x 110.0 cf + 14.9 cf Cap Volume x 2 x 5 Rows = 10,594.4 cf Chamber Storage 29,728.4 cf Field - 10,594.4 cf Chambers = 19,134.0 cf Stone x 40.0% Voids = 7,653.6 cf Stone Storage Chamber Storage + Stone Storage = 18,248.0 cf = 0.419 af Overall Storage Efficiency = 61.4% Overall System Size = 141.93' x 38.08' x 5.50' 95 Chambers 1,101.1 cy Field 708.7 cy Stone 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 26HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond BASIN: Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.619 ac Peak Elev=15.72' Storage=0.258 af 9.28 cfs 4.05 cfs 0.16 cfs 3.90 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 27HydroCAD® 10.20-5c 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=3.97"Subcatchment PR 1A-P: Flow Length=203' Tc=5.9 min CN=78 Runoff=1.36 cfs 0.100 af Runoff Area=36,906 sf 100.00% Impervious Runoff Depth=6.20"Subcatchment PR 1B-I: Flow Length=136' Tc=1.5 min CN=98 Runoff=5.73 cfs 0.438 af Runoff Area=77,195 sf 0.00% Impervious Runoff Depth=4.07"Subcatchment PR 1B-P: Flow Length=180' Tc=7.5 min CN=79 Runoff=7.82 cfs 0.602 af Runoff Area=7,405 sf 0.00% Impervious Runoff Depth=3.76"Subcatchment PR 2-P: Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=0.76 cfs 0.053 af Inflow=12.08 cfs 1.040 afReach 10R: Outflow=12.08 cfs 1.040 af Inflow=6.00 cfs 0.870 afReach DP1-PR: Outflow=6.00 cfs 0.870 af Inflow=0.76 cfs 0.053 afReach DP2-PR: Outflow=0.76 cfs 0.053 af Peak Elev=16.44' Storage=0.318 af Inflow=12.08 cfs 1.040 afPond BASIN: Discarded=0.18 cfs 0.270 af Primary=5.14 cfs 0.770 af Outflow=5.32 cfs 1.040 af Total Runoff Area = 3.092 ac Runoff Volume = 1.193 af Average Runoff Depth = 4.63" 72.60% Pervious = 2.244 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 28HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1A-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 0 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=13,167 sf Runoff Volume=0.100 af Runoff Depth=3.97" Flow Length=203' Tc=5.9 min CN=78 1.36 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 29HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1B-I: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 6 5 4 3 2 1 0 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=36,906 sf Runoff Volume=0.438 af Runoff Depth=6.20" Flow Length=136' Tc=1.5 min CN=98 5.73 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 30HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1B-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 25-Year Rainfall=6.44" Runoff Area=77,195 sf Runoff Volume=0.602 af Runoff Depth=4.07" Flow Length=180' Tc=7.5 min CN=79 7.82 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 31HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 2-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.8 0.75 0.7 0.65 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 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 0.76 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.