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Swale A swale is a shallow vegetated surface channel (often adjacent roads, car parks and residential areas ) used to collect surface water run-off and convey it to an outfall. Swales mimic natural drainage patterns by allowing rainwater to run in sheets through vegetation. The vegetation helps filter pollutants in the flow and swales may also permit infiltration. If available, alkaline soils and sub-soils should be used to promote the removal and retention of metals to encourage good vegetation growth. Increasing the surface area of the vegetation exposed to run-off improves the effectiveness of the system.
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