All laws relating to the school board, library board, airport authority, planning and zoning commission, zoning board of adjustment, park or recreation board, and any municipally owned service enterprise, and any board, authority, or agency given such independent status, as the same may apply and be in effect at the time when the municipality shall elect to be governed by the provisions of this chapter, shall continue in full force and effect and without interruption or change as to the establishment or conduct of any such authority, board or agency, until otherwise provided by law.
Ala. Code § 11-43D-13 (1975)