(1) Two or more irrigation districts may be consolidated into one district as provided in RCW 87.03.535 through 87.03.551 and may include in such district other lands susceptible of irrigation in the manner provided in this act, and upon the organization of such consolidated district it shall be an organized irrigation district subject to the provisions of this chapter.

(2) A smaller irrigation district may be merged into a larger irrigation district as provided in RCW 87.03.845 through 87.03.855 if the assessed acreage in the smaller district constitutes not more than thirty percent of the combined assessed acreage of the two districts. In such a proceeding, the smaller district is referred to as the "minor" irrigation district and the larger district is referred to as the "major" irrigation district. The district resulting from such a merger shall be an organized district subject to the provisions of this chapter.