Miss. Code § 51-8-3
A joint water management district may be created for the purpose of establishing a water supply system, conserving water resources, developing additional water resources or any other water or wastewater management function not being performed by an existing water management district, except that such a district as described in Section 51-8-1 may not be created for the purpose of constructing, contracting for the construction of, or serving as a local sponsor for the construction of, any dam or other flood control facility or project, the primary purpose of which is to control flooding on any part of the Pearl River, Mississippi River, Yazoo River, Tombigbee River, Big Black River, Pearl River, Pascagoula River, Tallahatchie River, Yalobusha River, Homochito River, Buffalo River, Leaf River, Coldwater River, Sunflower River, Little Sunflower River, Wolf River, Yockanookany River, Ofahoma River, Strong River, Bogue Chitto River, Amite River, Bayou Pierre River, Tangipahoa River, Noxubee River, Buttahatchee River, Chunky River, Biloxi River, Tippah River, Hatchie River, Jourdan River, Bowie River, Chickasawhay River and Escatawpa River.
Miss. Code § 51-8-3