241220_42 ERW_Stormwater Report FULL

NOAA 24-hr D 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 32HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach 10R: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.619 ac 12.08 cfs 12.08 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 33HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach DP1-PR: Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 6 5 4 3 2 1 0 Inflow Area=2.922 ac 6.00 cfs 6.00 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 34HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Reach DP2-PR: Inflow Outflow 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 Inflow Area=0.170 ac 0.76 cfs 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.

NOAA 24-hr D 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 35HydroCAD® 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 25-Year Rainfall=6.44"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 36HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond BASIN: Inflow Outflow Discarded Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.619 ac Peak Elev=16.44' Storage=0.318 af 12.08 cfs 5.32 cfs 0.18 cfs 5.14 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 37HydroCAD® 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=6.00"Subcatchment PR 1A-P: Flow Length=203' Tc=5.9 min CN=78 Runoff=2.01 cfs 0.151 af Runoff Area=36,906 sf 100.00% Impervious Runoff Depth=8.42"Subcatchment PR 1B-I: Flow Length=136' Tc=1.5 min CN=98 Runoff=7.71 cfs 0.594 af Runoff Area=77,195 sf 0.00% Impervious Runoff Depth=6.13"Subcatchment PR 1B-P: Flow Length=180' Tc=7.5 min CN=79 Runoff=11.55 cfs 0.905 af Runoff Area=7,405 sf 0.00% Impervious Runoff Depth=5.76"Subcatchment PR 2-P: Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 Runoff=1.14 cfs 0.082 af Inflow=17.23 cfs 1.499 afReach 10R: Outflow=17.23 cfs 1.499 af Inflow=9.92 cfs 1.363 afReach DP1-PR: Outflow=9.92 cfs 1.363 af Inflow=1.14 cfs 0.082 afReach DP2-PR: Outflow=1.14 cfs 0.082 af Peak Elev=18.12' Storage=0.413 af Inflow=17.23 cfs 1.499 afPond BASIN: Discarded=0.23 cfs 0.287 af Primary=8.95 cfs 1.212 af Outflow=9.19 cfs 1.499 af Total Runoff Area = 3.092 ac Runoff Volume = 1.732 af Average Runoff Depth = 6.72" 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 100-Year Rainfall=8.66"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 38HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1A-P: 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 39HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1B-I: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=36,906 sf Runoff Volume=0.594 af Runoff Depth=8.42" Flow Length=136' Tc=1.5 min CN=98 7.71 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"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 40HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 1B-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 12 11 10 9 8 7 6 5 4 3 2 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=77,195 sf Runoff Volume=0.905 af Runoff Depth=6.13" Flow Length=180' Tc=7.5 min CN=79 11.55 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 100-Year Rainfall=8.66"241220_42 ERW Waymaker Printed 12/20/2024Prepared by Colliers Engineering & Design Page 41HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Subcatchment PR 2-P: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 1 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 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.