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Permitting (Natural Drainage)

A natural drainage system (NDS) design is an alternative approach to a typical curb and gutter street improvement with underground drainage and detention systems. An NDS uses swales, landscaping, and permeable pavements to accomplish the following:

  • reduce the amount of impermeable surface in the street right-of-way;
  • filter pollutants from surface water through soil and plants; and,
  • slow the flow of water to improve habitat for fish and other wildlife in Seattle’s urban creeks.

Click here for more information about NDS in Seattle.

natural drainage system
NDS Project

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