The term of each manager is 3 years. Each manager shall serve until a successor is elected or appointed. Each year, the landowners shall meet to elect a successor to: any manager whose term expired on or before the date of the meeting; and any manager who died or resigned since the last annual meeting. A manager who is elected to fill a vacancy caused by death or resignation shall hold the office for the rest of the term. The county commissioners or county council shall appoint an individual to fill a vacancy on the board of managers if: the board of managers does not call an annual meeting of landowners; or the board of managers holds an annual meeting of landowners but a quorum is not present. The county commissioners or county council may appoint a manager to fill a vacancy on the board of managers until the next annual meeting of landowners.