S.D. Codified Laws § 46A-10A-100

The board of county commissioners shall at their next session, set a date, time, and location for a meeting of district landowners to conduct an election to determine if a drainage district shall be governed by three trustees and shall enter an order to that effect. The election meeting shall be held within forty-five days from the date of the order. The board shall appoint from the landowners of the district a superintendent and two clerks of election to serve as an election board who shall convene the meeting, take minutes, and conduct the election.