Ala. Code § 45-37-170.22: Board of Directors.

(a) The board of directors of the authority shall consist of 11 members residing in Jefferson County. Three members, two of whom shall reside in the unincorporated areas of Jefferson County and one who shall reside in the Bessemer cutoff area, shall be chosen for six, eight, and 10-year terms, respectively, commencing with their appointment by the County Commission of Jefferson County; three members for six, eight, and 10-year terms commencing with their appointment by the governing body of the City of Birmingham; three members each for four-year terms commencing with their appointment by the Jefferson County Mayor’s Association, or its successor; one member for a two-year term commencing with the appointment by the Jefferson County Senate Delegation in the Legislature of Alabama; and one member for a two-year term commencing with the appointment by the Jefferson County House Delegation in the Legislature of Alabama. Upon completion of the initial staggered terms, all subsequent appointments of the members shall be made by the same method for terms of four years. Directors shall continue in office after the expiration of their terms until a successor is appointed and qualified by the filing of written evidence of appointment from the appropriate appointing authority.

(b) Vacancies on the board during a term shall be filled for the unexpired portion of the term in the same manner and by the same appointing authority as the member whose place is being filled.