Changes

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.

===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>

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==References==

==References==