SDCL § 31-12A-19: Rules and regulations of trustees--Meetings--Quorum.

The board of trustees shall adopt such rules and regulations for the conduct of the business of said board, and shall fix a stated time at which the regular meetings of said board shall be held. A majority of the board of trustees shall constitute a quorum but a smaller number may adjourn from day to day. A concurrence of the majority shall be necessary to any action of such board.