S.D. Codified Laws § 13-6-17
The plan shall be made a part of the minutes of the school board of the school district, or districts; one copy shall be filed with the board of county commissioners in each county in which the territory of the proposed district, or districts, is located; and two copies shall be delivered to the secretary of the Department of Education. If the plan is approved by the secretary of the Department of Education, it shall be valid and binding upon the districts for a period not to exceed one year, providing one or more of the districts approved the plan in accordance with § 13-6-47. However, if a different plan is presented to and approved by the secretary of the Department of Education, such approval shall supersede the last preceding approval.
SDCL 13-6-17