Vegetative Filtering Selection GuideKey Feasibility Factors

Channel Type Space Minimum Maintenance Cost

required head burden

Grass Channel 6.5% 2 feet mowing low

Dry Swale 10-20% 2-6 feet mowing moderate

Wet Swale 10-20% 2-6 feet wetland low

Filter Strip 100% 2 feet edge scraping low

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While vegetative filters are subject to fewer site constraints than other types of stormwater treatment systems, there are a few key factors that should be screened in the selection process including space consumption, minimum head, maintenance burden, cost and soil conditions. These feasibility factors are compared in a matrix format in this slide.