Any irrigation district may accept any of the provisions of any act of Congress of the United States applicable to the district and may obligate itself to comply with laws, rules, and regulations promulgated by any department of the United States pursuant to the act. Irrigation districts contracting with the United States under the provisions of this chapter shall be governed in all matters by the laws of the state relating to irrigation or drainage districts, as the case may be, except in such things as may be otherwise provided for such districts. This section does not limit the rights of any irrigation district under existing laws to purchase a water supply, or otherwise contract, and is cumulative to such existing laws.
SDCL 46A-6-30