S.D. Codified Laws § 46A-4-45
The board of directors shall hold regular meetings in its office each month on a day specified in the bylaws of the district at such time as the president shall designate and shall hold such special meetings as may be required for proper transaction of business. All special meetings shall be ordered by the president of the board, the order to be entered of record, and five days' notice thereof shall be given to each member unless notice is either waived in writing or by the presence of the director at the special meeting. The president shall also order a special meeting upon the request of any two directors. The order shall specify the business to be transacted and no other business than that specified shall be transacted at a special meeting. All meetings of the board shall be public. A majority of the members shall constitute a quorum for the transaction of business. Upon all questions requiring a vote there shall be a concurrence of at least a majority of the board.
SDCL 46A-4-45