The board of dike commissioners shall consist of three elected commissioners. The initial commissioners shall be appointed, and the elected commissioners elected, as provided in chapter 85.38 RCW. The board of dike commissioners shall have the exclusive charge of the construction and maintenance of all dikes or dike systems which may be constructed within the district, and shall be the executive officers thereof, with full power to bind the district by their acts in the performance of their duties, as provided by law.