At the same meeting when said order is made, or at a called meeting within five days thereafter, the court shall appoint a board of directors consisting of three members, all of whom shall be freehold property taxpayers and legal voters of the county embraced in whole or in part within the district, and more than twenty-one years of age. Each shall receive three dollars per day for each day necessarily taken in the discharge of their duties as such; and shall hold office for two years, unless sooner removed by a majority vote of said court. Upon the expiration of their terms of office, the court shall appoint their successors by majority vote. Should any vacancy occur in said board, the same shall be filled in like manner by said court.