A landowner who owns assessed irrigable land which is no longer useful or suitable for irrigation may transfer and substitute such land for other land owned by such landowner within the district or to land outside of but adjacent to the district when such transfer is approved by the board of directors of the district. The unsuitable land from which the transfer is made shall become nonirrigable land and the land to which the transfer is made shall become irrigable land.
Okla. Stat. tit. 82, § 277.26