(a) The navigation board shall include the county judge and the members of the commissioners court and the mayor and the aldermen or commissioners of the city or cities.
(b) A majority in number of the persons composing the board shall constitute a quorum, and the action of a majority of the quorum shall control.

(c) The board shall pass on the petition to create the district and the election to approve creation of the district with each individual member having one vote.
(d) The duties and powers of the county judge and members of the commissioners court, the mayor and aldermen or commissioners of cities, and the county clerk and other officers are a part of the legal duties of the officials which they shall perform without additional compensation, unless otherwise provided in this chapter.