This chapter does not apply to the merger of irrigation districts authorized under RCW
87.03.530(2) and
87.03.845 through
87.03.855 or to the merger of a drainage improvement district, joint drainage improvement district, or consolidated drainage improvement district into an irrigation district authorized by RCW
87.03.720 through
87.03.745 and
85.08.830 through
85.08.890.