241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 31HydroCAD® 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 = 3.15" for 10-Year event Inflow = 4.41 cfs @ 12.14 hrs, Volume= 0.767 af Outflow = 4.41 cfs @ 12.14 hrs, Volume= 0.767 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) 4 3 2 1 0 Inflow Area=2.922 ac 4.41 cfs 4.41 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 32HydroCAD® 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 = 2.72" for 10-Year event Inflow = 0.55 cfs @ 12.11 hrs, Volume= 0.039 af Outflow = 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-P: (new Reach) 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 33HydroCAD® 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 = 3.59" for 10-Year event Inflow = 6.72 cfs @ 12.10 hrs, Volume= 0.576 af Outflow = 6.72 cfs @ 12.10 hrs, Volume= 0.576 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) 7 6 5 4 3 2 1 0 Inflow Area=1.926 ac 6.72 cfs 6.72 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 34HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Reach PDA-1C: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.693 ac, 38.96% Impervious, Inflow Depth = 3.71" for 10-Year event Inflow = 2.49 cfs @ 12.08 hrs, Volume= 0.214 af Outflow = 2.49 cfs @ 12.08 hrs, Volume= 0.214 af, Atten= 0%, Lag= 0.0 min Routed to Pond Basin 2 : (new Pond) Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach PDA-1C: (new Reach) Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 Inflow Area=0.693 ac 2.49 cfs 2.49 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 35HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Pond Basin 1: (new Pond) Inflow Area = 1.926 ac, 29.96% Impervious, Inflow Depth = 3.59" for 10-Year event Inflow = 6.72 cfs @ 12.10 hrs, Volume= 0.576 af Outflow = 1.66 cfs @ 12.47 hrs, Volume= 0.509 af, Atten= 75%, Lag= 22.3 min Primary = 1.66 cfs @ 12.47 hrs, Volume= 0.509 af Routed to Reach DP1-P : (new Reach) Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 15.76' @ 12.47 hrs Surf.Area= 0.121 ac Storage= 0.257 af Plug-Flow detention time= 210.6 min calculated for 0.508 af (88% of inflow) Center-of-Mass det. time= 153.1 min ( 949.3 - 796.2 ) Volume Invert Avail.Storage Storage Description #1A 12.75' 0.169 af 37.08'W x 141.93'L x 5.50'H Field A 0.665 af Overall - 0.243 af Embedded = 0.421 af x 40.0% Voids #2A 13.50' 0.243 af ADS_StormTech MC-3500 d +Cap x 95 Inside #1 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 95 Chambers in 5 Rows Cap Storage= 14.9 cf x 2 x 5 rows = 149.0 cf 0.412 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 13.80' 5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 14.80' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 17.50' 1.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.66 cfs @ 12.47 hrs HW=15.76' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.87 cfs @ 6.37 fps) 2=Orifice/Grate (Orifice Controls 0.80 cfs @ 4.05 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 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 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 36HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 1: (new Pond) - 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 + 12.0" Side Stone x 2 = 37.08' 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 28,947.8 cf Field - 10,594.4 cf Chambers = 18,353.4 cf Stone x 40.0% Voids = 7,341.3 cf Stone Storage Chamber Storage + Stone Storage = 17,935.8 cf = 0.412 af Overall Storage Efficiency = 62.0% Overall System Size = 141.93' x 37.08' x 5.50' 95 Chambers 1,072.1 cy Field 679.8 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 37HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 1: (new Pond) Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 7 6 5 4 3 2 1 0 Inflow Area=1.926 ac Peak Elev=15.76' Storage=0.257 af 6.72 cfs 1.66 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 38HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Pond Basin 2: (new Pond) Inflow Area = 0.693 ac, 38.96% Impervious, Inflow Depth = 3.71" for 10-Year event Inflow = 2.49 cfs @ 12.08 hrs, Volume= 0.214 af Outflow = 2.28 cfs @ 12.12 hrs, Volume= 0.186 af, Atten= 8%, Lag= 2.3 min Primary = 2.28 cfs @ 12.12 hrs, Volume= 0.186 af Routed to Reach DP1-P : (new Reach) Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 17.21' @ 12.12 hrs Surf.Area= 0.031 ac Storage= 0.062 af Plug-Flow detention time= 165.3 min calculated for 0.186 af (87% of inflow) Center-of-Mass det. time= 101.2 min ( 888.9 - 787.7 ) Volume Invert Avail.Storage Storage Description #1A 14.00' 0.029 af 34.75'W x 39.22'L x 3.50'H Field A 0.109 af Overall - 0.037 af Embedded = 0.073 af x 40.0% Voids #2A 14.50' 0.037 af ADS_StormTech SC-740 +Cap x 35 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 35 Chambers in 7 Rows 0.066 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 15.40' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 16.30' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Primary 17.05' 3.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.19 cfs @ 12.12 hrs HW=17.18' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.21 cfs @ 6.24 fps) 2=Orifice/Grate (Orifice Controls 1.50 cfs @ 3.83 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 0.47 cfs @ 1.19 fps) 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 39HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 2: (new Pond) - Chamber Wizard Field A Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length) Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing 5 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 37.22' Row Length +12.0" End Stone x 2 = 39.22' Base Length 7 Rows x 51.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 34.75' Base Width 6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height 35 Chambers x 45.9 cf = 1,607.9 cf Chamber Storage 4,769.7 cf Field - 1,607.9 cf Chambers = 3,161.8 cf Stone x 40.0% Voids = 1,264.7 cf Stone Storage Chamber Storage + Stone Storage = 2,872.6 cf = 0.066 af Overall Storage Efficiency = 60.2% Overall System Size = 39.22' x 34.75' x 3.50' 35 Chambers 176.7 cy Field 117.1 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"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 40HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Pond Basin 2: (new Pond) Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 2 1 0 Inflow Area=0.693 ac Peak Elev=17.21' Storage=0.062 af 2.49 cfs 2.28 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.