Tex. Water Code § 56.0641

(a) In those districts referred to in Subsection (b) of Section 56.064, until otherwise ordered by the board of directors, the three persons receiving the highest number of votes at each election are elected. By order made before the 60th day preceding an election for directors, the board of directors in those districts referred to in Subsection (b) of Section 56.064 may order that the election of directors for that district shall be by position or place, designated as Place No. 1, Place No. 2, and Place No. 3. The order shall designate the place numbers in relation to the directors then in office, and these place designations shall be observed in all future elections. The person receiving the highest number of votes for each position or place is elected. Once the board of directors has adopted the place system for election, neither that board nor their successors may rescind the action.

(b) A person wishing to have his name printed on the ballot as a candidate for director in those districts referred to in Subsection (b) of Section 56.064 shall file a signed application with the secretary of the board of directors not later than 5 p.m. of the 31st day preceding the election.

(c) The board of directors in those districts referred to in Subsection (b) of Section 56.064 shall order the election, appoint the election judges, canvass the returns, and declare the results of the election. In other respects, the procedures for conducting the election and for voting are as specified in the Texas Election Code. The expenses of holding the election shall be paid out of the construction and maintenance fund of the district.