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Natural Drainage

Natural Drainage Swale in HighpointAccording to the Right-of-Way Improvements Manual, Natural Drainage Systems (NDS) are street rights of way designed to use planted swales adjacent to sidewalk or roadway pavement to do the work of pipes, by capturing stormwater and letting it soak into the ground and/or be filtered by vegetation. NDS attempts to mimic the natural system that existed before development which has significantly increased runoff and its associated pollutants. Green Stormwater Infrastructure components, such as bioretention and permeable pavements, are integral components to an NDS designExamples of NDS systems in Seattle can be found at the Citys Natural Drainage System Capital Program (6.4.2). These elements can be located within the landscape/furniture zone to create a buffer between the roadway and a walkway.

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