Wash. Rev. Code § 57.02.080
The procedures and provisions of RCW 85.08.830 through 85.08.890, which are applicable to drainage improvement districts, joint drainage improvement districts, or consolidated drainage improvement districts that desire to merge into irrigation districts, shall also apply to districts organized, or reorganized, under this title that desire to merge into irrigation districts.
The authority granted by this section shall be cumulative and in addition to any other power or authority granted by law to any district.
RCW 57.02.080
Part headings not law-Effective date-1996 c 230: See notes following RCW 57.02.001.
Merger of irrigation district with drainage, joint drainage, consolidated drainage improvement, or water-sewer district: RCW 87.03.720, 87.03.725.