For the purpose heretofore expressed and the execution of the powers provided in this article, each county of the state is hereby declared to be and is hereby created a drainage district. The county commission with the judge of probate as chairman shall act as and exercise the powers of a board of drainage commissioners, or board of water management commissioners, and shall have control of the affairs of the district. This shall in no way affect drainage districts or water management districts organized under Title 2, Sections 208 through 262 of the 1940 Alabama Code or water management districts organized under Sections 9-9-1 through 9-9-58.