(a) The board of managers must consist of seven members. The commissioners court of the county and the governing body of the municipality shall each appoint three members and shall jointly appoint one member.
(b) The members of the board are appointed for staggered terms of two years with the terms of two members appointed by the commissioners court and two members appointed by the governing body of the municipality expiring on February 1 of each odd-numbered year and the remaining terms expiring on February 1 of each even-numbered year.

(c) When the commissioners court or the governing body of the municipality makes its initial appointments to the board, it shall designate two of the members it appoints for terms expiring on the first February 1 of an odd-numbered year that follows the date of the appointments. The remaining appointments shall be designated for terms that expire on the first February 1 of an even-numbered year that follows the date of the appointments.
(d) A vacancy on the board shall be filled for the unexpired part of the term in the same manner that the original appointment was made.