Recommendations for Winter Traction Materials Management On Roadways Adjacent to Bodies of Water 2004
Recommendations for Winter Traction Materials Management On Roadways Adjacent to Bodies of Water 2004
Western Transportation Institute
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These grassy filter strips are often used as a pretreatment for other BMPs with a larger capacity, and this practice is best for smaller drainage areas as it is only able to treat low intensity rainfall events. The primary limitation in their applicability is the establishment of vegetation and the assurance of sheet flow; otherwise, filter strips are highly flexible tools (Federal Highway Administration 1997). Site Criteria The best locations for vegetated filter strips are naturally low topog...raphic areas of uniform grade (e.g., roadside ditches), and filter strips can easily be placed along roadsides. Vegetative filter strips may be difficult to establish in arid areas where it is difficult to sustain growth, but they can be used almost anywhere else. Engineering Characteristics Vegetated filter strips should have a minimum length of 25 feet, slopes between 2% and 6% (Caraco and Claytor 1997), and the slope of the contributing drainage area should not exceed 10% (Watson 1994). To allow for uniform sheet flow, the maximum recommended impervious drainage area for vegetated filter strips is 5 acres (Watson 1994).
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