241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 2-Year Rainfall=3.44"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 11HydroCAD® 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 = 0.97 cfs @ 12.06 hrs, Volume= 0.072 af, Depth= 3.21" 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 2-Year Rainfall=3.44" 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) 1 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=11,760 sf Runoff Volume=0.072 af Runoff Depth=3.21" Tc=1.0 min CN=98 0.97 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 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 Subcatchment PDA-1C(PERV): (new Subcat) Runoff = 0.68 cfs @ 12.15 hrs, Volume= 0.051 af, Depth= 1.45" 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 2-Year Rainfall=3.44" 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) 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 2-Year Rainfall=3.44" Runoff Area=18,423 sf Runoff Volume=0.051 af Runoff Depth=1.45" Flow Length=123' Tc=7.2 min CN=78 0.68 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 2-Year Rainfall=3.44"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 Summary for Subcatchment PDA-2 (PERV.): (new Subcat) [49] Hint: Tc<2dt may require smaller dt Runoff = 0.26 cfs @ 12.11 hrs, Volume= 0.019 af, Depth= 1.32" 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 2-Year Rainfall=3.44" 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) 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=7,411 sf Runoff Volume=0.019 af Runoff Depth=1.32" Flow Length=84' Slope=0.0833 '/' Tc=4.6 min CN=76 0.26 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 2-Year Rainfall=3.44"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 Reach DP1-P: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 2.922 ac, 29.00% Impervious, Inflow Depth > 1.60" for 2-Year event Inflow = 1.41 cfs @ 12.23 hrs, Volume= 0.389 af Outflow = 1.41 cfs @ 12.23 hrs, Volume= 0.389 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) 1 0 Inflow Area=2.922 ac 1.41 cfs 1.41 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 2-Year Rainfall=3.44"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 Reach DP2-P: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.170 ac, 0.00% Impervious, Inflow Depth = 1.32" for 2-Year event Inflow = 0.26 cfs @ 12.11 hrs, Volume= 0.019 af Outflow = 0.26 cfs @ 12.11 hrs, Volume= 0.019 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) 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.170 ac 0.26 cfs 0.26 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 2-Year Rainfall=3.44"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 Reach PDA-1B: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 1.926 ac, 29.96% Impervious, Inflow Depth = 2.03" for 2-Year event Inflow = 3.81 cfs @ 12.09 hrs, Volume= 0.325 af Outflow = 3.81 cfs @ 12.09 hrs, Volume= 0.325 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) 4 3 2 1 0 Inflow Area=1.926 ac 3.81 cfs 3.81 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 2-Year Rainfall=3.44"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 PDA-1C: (new Reach) [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.693 ac, 38.96% Impervious, Inflow Depth = 2.14" for 2-Year event Inflow = 1.45 cfs @ 12.08 hrs, Volume= 0.123 af Outflow = 1.45 cfs @ 12.08 hrs, Volume= 0.123 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) 1 0 Inflow Area=0.693 ac 1.45 cfs 1.45 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 2-Year Rainfall=3.44"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 Pond Basin 1: (new Pond) Inflow Area = 1.926 ac, 29.96% Impervious, Inflow Depth = 2.03" for 2-Year event Inflow = 3.81 cfs @ 12.09 hrs, Volume= 0.325 af Outflow = 0.57 cfs @ 12.85 hrs, Volume= 0.258 af, Atten= 85%, Lag= 45.6 min Primary = 0.57 cfs @ 12.85 hrs, Volume= 0.258 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= 14.76' @ 12.85 hrs Surf.Area= 0.121 ac Storage= 0.164 af Plug-Flow detention time= 281.3 min calculated for 0.257 af (79% of inflow) Center-of-Mass det. time= 194.6 min ( 1,000.8 - 806.2 ) 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=0.57 cfs @ 12.85 hrs HW=14.76' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.57 cfs @ 4.17 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 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 2-Year Rainfall=3.44"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 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 2-Year Rainfall=3.44"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 Pond Basin 1: (new Pond) Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 4 3 2 1 0 Inflow Area=1.926 ac Peak Elev=14.76' Storage=0.164 af 3.81 cfs 0.57 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.