Important Notice about Drainage Standards

Important Notice about the City of Des Moines Drainage Standards.
Per DMMC 11.08.060(2), subsequently amended versions of the King County Surface Water Design Manual are adopted by reference pursuant to RCW 35.21.180. Effective July 23, 2021, the 2021 King County Surface Water Design Manual (KCSWDM) will be used as the City’s drainage standards.

For details, click here for the announcement memo.