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Line 35: − + − #[[Vegetated filter strips|Vegetated Filter Strips: Full Infiltration]] − + − + + − + + − + − − 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> − + − +
Vegetated Filter Strip: Life Cycle Costs (view source)
Revision as of 19:03, 10 March 2023
, 1 year ago→Design Assumptions
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.
===Notes===
===Notes===
* Design includes [[pretreatment]] through stone diaphragms at [[Curb cuts|curb inlets]].
* Design includes [[pretreatment]] through stone diaphragms at [[Curb cuts|curb inlets]].
* Operation and maintenance cost estimates assume rehabilitation of the filter strip surface is required after 25 years of operation.
* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.
==Construction Costs==
==Construction Costs==
[[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''']]
Above you can find a cost breakdown of vegetated filter strips in the following configuration type:<br>
Above you can find a breakdown of construction costs by expense type for the 500 m<sup>2</sup> surface area vegetated filter strip (I:P area ratio of 4:1)<br>
The Material & Installation expenses represent the largest portion of total construction costs (55%).
The Material & Installation expenses represent the largest portion of total construction costs (55%).
==Life Cycle Costs==
==Life Cycle Costs==
Below are capital and life cycle cost estimates for an [[Rainwater harvesting|Underground Rainwater Cistern]], Non-Infiltrating configuration over 25- and 50-year time periods. The estimates of maintenance and rehabilitation (life cycle) costs represent net present values. Operation and maintenance costs are predicted to represent 46% of total life cycle costs over the 25-year evaluation period, and increase to 60% of total life cycle costs over the 50-year period, due to increased levels of litter removal, vaccuum cleaning of the associated catchbasin, watering during the first and 2nd years (establishment period), annual watering, drought watering, mowing and aerating the grass, weeding and pruning and replacing any wilting/dying sections with new sod.
Below are capital and life cycle cost estimates for the [[Vegetated filter strip]] design configuration over 25- and 50-year time periods. The estimates of maintenance and rehabilitation (life cycle) costs represent net present values. Operation and maintenance costs are predicted to represent 46% of total life cycle costs over the 25-year evaluation period, and increase to 60% of total life cycle costs over the 50-year period, due to filter strip surface rehabilitation costs assumed to be required after 25 years of operation.
===25-Year life cycle cost break down===
===25-Year life cycle cost break down===
[[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''']]
<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>
===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>]]
[[File:Design Table VegStrip Full Infil.PNG|700px]]<br>
[[File:Design Table VegStrip Full Infil update 2023.PNG|800px]]<br>
</br>
</br>
==References==
==References==