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Duvall staff present draft updates to sensitive-areas code, including larger riparian buffers
Summary
City staff described a 10-year update to the sensitive-areas regulations (wetlands, streams, geologic hazards). Key changes include no straight buffer reductions (favoring buffer averaging), habitat-based fish-stream definitions, riparian management zones sized by site-potential tree height (up to ~215 ft), and protections for existing development; staff will circulate the draft and return in July.
City planning staff told the council on June 16 that the city’s sensitive-areas ordinance — the update the state requires roughly every 10 years — has been revised to reflect the latest best-available science and feedback from state agencies and tribes.
Staff described multiple technical changes: updated delineation and wetland-ratio methods; elimination of simple buffer reductions in favor of buffer averaging to maintain or improve overall ecological function; broader, habitat‑based criteria for designating fish-bearing (Type F) streams rather than relying solely on observed fish presence; and converting traditional stream buffers to riparian management zones sized using site-potential tree height (a method supported by the Department of Fish and Wildlife and tribal partners). Those management zones could be as wide as roughly 215 feet for mature Douglas-fir site potential.
Planners said the draft includes stronger tribal coordination language and explicit protections for existing homes, lawns and legal nonconforming uses so that increased buffers do not automatically force removal of established development. The draft has been circulated to state agencies, tribes and stakeholders and will be refined before returning to council and the Planning Commission for a public hearing later in the adoption process.
Staff acknowledged the changes will affect permitting for some properties but said the intent is to balance environmental protection with reasonable allowances for property owners and essential infrastructure. The city aims to complete the update by the end of the year, consistent with state timelines; staff asked for comments by June 26 to incorporate into the July draft.
No ordinance vote occurred on June 16; the matter will return with additional technical materials and a proposed ordinance for public hearing and adoption steps.
