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County of King Surface Water Management Ordinance

County Of King   
Urban | Suburban | Rural
The Surface Water Management Title is a comprehensive set of regulations focused on surface water management. A drainage review is required for certain projects such as all development with >5000 SF of impervious surface, development near sensitive or critical areas, or is development of an existing site over certain size and financial thresholds. Drainage review consists of several core requirements including discharge requirements, off-site analysis, and flow control. There is also a Water Quality section that implements a fee structure based upon impervious cover on each serviced parcel of land. The King County Surface Water Design Manual is also an important document that the county relies on for implementation of requirements set forth in Title 9.