The definitions set forth in this section apply through this chapter.
(1) "Board" means the county legislative authority.
(2) "Flood control improvement" means any works, projects, or other facilities necessary for the control of flood waters within the county or any zone or zones.
(3) "Flood waters" and "stormwaters" means any storm waste or surplus waters, including surface water, wherever located within the county or a zone or zones where such waters endanger public highways, streams and water courses, harbors, life, or property.
(4) "Participating zones" means two or more zones found to benefit from a single flood control improvement or stormwater control improvement.
(5) "Stormwater control improvement" means any works, projects, or other facilities necessary to control and treat stormwater within the county or any zone or zones.
(6) "Supervisors" means the board of supervisors, or governing body, of a zone.
(7) "Zones" means flood control zone districts which are quasi municipal corporations of the state of Washington created by this chapter.