(a) All powers granted to a groundwater management district under the provisions of this act shall be exercised by an elected board of directors which shall be composed of the number of persons specified in the petition. Each director shall serve for a period of three (3) years and until his or her successor is duly elected and qualified, except that as nearly as possible one-third of the original directors shall serve for a term of one (1) year, one-third shall serve for a term of two (2) years, and one-third shall serve for a term of three (3) years. The directors shall serve without compensation but shall be allowed actual and necessary expenses incurred in the performance of their official duties.

(b) The board of directors, after being duly elected, shall elect from its number a president, a vice-president, a secretary, and a treasurer. In districts having only three (3) directors, the board shall elect one director to hold the offices of secretary and treasurer.

(c) A majority of the directors shall constitute a quorum for the transaction of business and a majority of those voting shall determine all actions taken by the board. In the absence of any of the duly elected officers, those directors present at any meeting may select a director to act as an officer pro tem.

(d) The elected board shall fill any vacancy occurring on the board prior to the expiration of the term of any director by selecting a replacement from among the eligible voters of the district to serve for the unexpired term.