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| Design and operation and maintenance program assumptions used to generate cost estimates are based on tool default values and the following STEP recommendations: | | Design and operation and maintenance program assumptions used to generate cost estimates are based on tool default values and the following STEP recommendations: |
− | * Filter strip length of 5 metres. | + | * Filter strip length of 5 metres and width of 100 metres. |
| * Maximum acceptable impervious drainage area to pervious footprint area ratio of 4:1. | | * Maximum acceptable impervious drainage area to pervious footprint area ratio of 4:1. |
| * Swale (0.3 m depth) and ditch inlet catch basin connected to storm sewer as outlet. | | * Swale (0.3 m depth) and ditch inlet catch basin connected to storm sewer as outlet. |
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| ==Construction Costs== | | ==Construction Costs== |
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− | [[File:Construction Breakdown VegStrip Full Infil.PNG|thumb|center|950px|'''Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Full Infiltration Design, 25 mm Treatment''']] | + | [[File:Construction Breakdown VegStrip Full Infil 2023.PNG|thumb|center|950px|'''Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Full Infiltration Design, 25 mm Treatment''']] |
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| ===25-Year life cycle cost break down=== | | ===25-Year life cycle cost break down=== |
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− | [[File:25yr LCCT VegStrip Full Infil.PNG|thumb|center|900px|'''Vegetated Filter Strips: Full Infiltration''']] | + | [[File:25yr LCCT VegStrip Full Infil 2023.PNG|thumb|center|900px|'''Vegetated Filter Strips: Full Infiltration''']] |
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| <small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br> | | <small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br> |
| + | </br> |
| | | |
| ===50-Year life cycle cost break down=== | | ===50-Year life cycle cost break down=== |
| | | |
− | [[File:50yr LCCT VegStrip Full Infil.PNG|thumb|center|900px|'''Vegetated Filter Strips: Full Infiltration''']] | + | [[File:50yr LCCT VegStrip Full Infil 2023.PNG|thumb|center|900px|'''Vegetated Filter Strips: Full Infiltration''']] |
| | | |
| <small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br> | | <small>'''Note:''' Click on each image to enlarge to view associated life cycle cost estimate.</small><br> |
| + | </br> |
| | | |
| ==Cost Summary Tables== | | ==Cost Summary Tables== |
− | Total life cycle cost estimates for a [[Vegetated filter strips|Vegetated filter strip]], Non-Infiltrating configuration is ($41,448.47). <br> | + | Total life cycle cost estimate over the 50 year evaluation period for the 500 m<sup>2</sup> [[Vegetated filter strip]] design configuration is ($105,570.23).<br> |
− | | |
− | It is notable that a sensitivity analysis was conducted in 2019 to compare construction cost estimates generated by the tool to actual costs of implemented projects. '''The analysis found that tool estimates were typically within ±14% of actual construction costs'''<ref>Credit Vally Conservation (CVC). 2019. Life-cycle costing tool 2019 update: sensitivity analysis. Credit Valley Conservation, Mississauga, Ontario. https://sustainabletechnologies.ca/app/uploads/2020/04/LCCT-Sensitivity-Analysis_March2020.pdf</ref>
| |
| | | |
| ===Full Infiltration=== | | ===Full Infiltration=== |
− | [[File:Filter bed grass pass.png|500px|thumb|Exampel of a mature filter strip beside a major highway, Washington State, U.S. (Photo Source: Washington State Department of Transportation, 2018)<ref>Washington State Department of Transportation. 2018. Vegetated Filter Strips: Low-impact development fact sheet. Authored by: Maria Cahill, Derek Godwin, and Jenna Tilt. Published June 2018. Accessed: 14 July 2022. https://catalog.extension.oregonstate.edu/em9208/html</ref>]] | + | [[File:Filter bed grass pass.png|600px|thumb|Exampel of a mature filter strip beside a major highway, Washington State, U.S. (Photo Source: Washington State Department of Transportation, 2018)<ref>Washington State Department of Transportation. 2018. Vegetated Filter Strips: Low-impact development fact sheet. Authored by: Maria Cahill, Derek Godwin, and Jenna Tilt. Published June 2018. Accessed: 14 July 2022. https://catalog.extension.oregonstate.edu/em9208/html</ref>]] |
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− | [[File:Design Table VegStrip Full Infil.PNG|700px]]<br> | + | [[File:Design Table VegStrip Full Infil update 2023.PNG|800px]]<br> |
| </br> | | </br> |
| | | |
| ==References== | | ==References== |