S.D. Codified Laws § 46A-4-60
Upon the adoption of the resolution specified in § 46A-4-57, if twenty-five percent of the electors of the district have made written protests against the proposed inclusion of lands within the district and have not withdrawn the protests, the board of directors shall order that an election be held within the district to determine whether the boundaries of the district shall be changed as mentioned in the resolution, and shall fix the time at which the election shall be held. The board shall cause notice of the election to be given, posted, and published, and the election shall be held and conducted. The returns of the election shall be made and canvassed, the result of the election ascertained and declared, and all things pertaining to the election conducted in the manner prescribed by chapter 46A-6 in case of a special election to determine whether bonds of an irrigation district shall be issued. The ballots cast at the election shall contain the words, "for change of boundary" or "against change of boundary," or equivalent terms. The notice of election shall describe the boundaries in such manner and terms that the boundary can be readily traced.
SDCL 46A-4-60