The failure to designate two of the director seats on the Colo-Nesco board filled at the September 1993 election to be for one-year terms was contrary to the requirements of Iowa Code section 275.41(7)(1991). The resulting 1-2-4 rotation of the director district seats is cinconsistent with statutory requirements asnd should not be maintained. The currrent board may take action to correct the rotation by designating two of the four directors elected in 1993 to serve one-year terms adn filling the seat these directors have held in the September 1994 election. The number of votes received by directors in the September 1993 election is a reasonable factor for the board to use in determining which of the directors elected in that election will be designated to serve one-year terms.