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Low Impact Development
Low Impact Development


To protect our waterways and preserve our iconic salmon, the City of Issaquah is working to set rules for low impact development (LID).

LID is a stormwater management strategy designed to mimic natural processes and limit the amount of rainwater runoff from buildings, streets and other man-made structures.

LID strategies include clustering buildings together, reducing the amount of pavement and other impervious surfaces, and removing contaminants from stormwater — a process known as bioretention.

Our review is required as part of our municipal stormwater permit from the Washington State Department of Ecology.

What's Required?
The revisions must be designed to minimize impervious surfaces, loss of native vegetation and stormwater runoff in all types of development situations.

Specifically, the City is required to:
  • Review, revise and make effective local development-related codes, rules, standards or other enforceable documents to incorporate and require LID principles and LID best management practices.
  • Adopt a drainage manual equivalent to the Washington State Department of Ecology's 2012 Stormwater Management Manual for Western Washington.

In the year ahead, we will review our land development rules to encourage LID and make implementing it easier for LID projects to proceed.

LID code review is occurring now through 2016. New stormwater and land use code revisions will go into effect Dec. 31, 2016.