Ala. Code § 45-57A-63.178

All laws relating to the school board, library board, hospital board, airport board, housing authority, plumbers or electricians board, planning board, zoning board, park or recreation board, municipally owned public utility, and any municipally owned service enterprise, including inter alia electric, gas, and water boards, agencies, etc., and any board, authority, agency, etc., given independent status, as the same may apply and be in effect at the time when the city shall elect to be governed by this part, shall continue in full force and effect and without interruption or change as to the establishment or conduct of any authority, board, or agency, until otherwise provided by law.