The five commissioners initially appointed shall be appointed for terms of one, two, three, four and five years respectively, and they shall serve until their successors have been appointed and qualified. Thereafter all commissioners appointed at the expiration of such respective terms shall be appointed in the same manner for terms of five years. Any vacancy which otherwise occurs shall be filled in the same manner as the initial appointment for the unexpired term. In making such appointments due regard shall be had for the requirement that the board of commissioners shall include at least one qualified voter and resident from a municipality which has been included in the district by consent of its governing authority.
La. R.S. § 33:7552