Changes

[[File:Vegetated_filter_strip_1.jpg|thumb|Hey Dean, What's the caption for this photo?]]

[[File:Vegetated_filter_strip_1.jpg|thumb|500px|Grass filter strip draining to vegetated swale.  Source: Trinkhaus Engineering]]

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==Overview==

==Overview==

*The flow path length across the vegetated filter strip should exceed the maximum flow path length across the impervious surface draining to it.

*The flow path length across the vegetated filter strip should exceed the maximum flow path length across the impervious surface draining to it.

*The filter strip should have a flow path length of ≥ 5 m; however, some pollutant removal benefits are realized ≥ 3 m.

*The filter strip should have a flow path length of ≥ 5 m; however, some pollutant removal benefits are realized ≥ 3 m.

===Pretreatment===

===Pretreatment===

*A [[gravel diaphragm]] at the top of the slope is always recommended.  

*A [[level spreader]] or [[gravel diaphragm]] at the top of the slope is always recommended.  

*When filter strip slopes are greater than 5 %, a series of [[level spreaders]], [[check dams]] or gravel diaphragms should be used to help maintain sheet flow.  

*When filter strip slopes are greater than 5%, a series of [[level spreaders]], [[check dams]] or gravel diaphragms should be used to help maintain sheet flow.  

*Filter strips should drain continuously as sheet flow until reaching a [[swales|swale]], [[bioretention]] facility, or other LID practice.

*Filter strips should drain continuously as sheet flow until reaching a [[swales|swale]], [[bioretention]] facility, or other LID practice.

===Soil Amendments===

===Soil Amendments===

If native soils on the filter strip site are highly compacted, or of such low fertility that vegetation cannot become established, they should be tilled to a depth of 300 mm and amended with [[compost]] to achieve an [[organic matter]] content of 8 - 15 %.

If native soils on the filter strip site are highly compacted, or of such low fertility that vegetation cannot become established, they should be tilled to a depth of 300 mm and amended with [[compost]] to achieve an [[organic matter]] content of 5 - 15 %.

==Landscaping==

==Landscaping==

{{:Filter strips: Performance}}

{{:Filter strips: Performance}}

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[[Category: Pretreatment]]

[[Category: Pretreatment]]