La. Stat. tit. 38 § 3321
The Acadiana Watershed District, referred to in this Chapter as the "district", is hereby created. The district shall lie within the Atchafalaya, Mermentau, Mermentau Headwaters, Teche, and Vermilion watersheds, situated in the parishes of Acadia, Allen, Avoyelles, Calcasieu, Cameron, Evangeline, Iberia, Iberville, Jefferson Davis, Lafayette, Pointe Coupee, Rapides, St. Landry, St. Martin, St. Mary, and Vermilion. The district boundaries within those parishes shall be aligned with the geographic area composed of Hydrologic Unit Subbasins 08080101, 08080102, 08080103, 08080201, and 08080202, as defined by the United States Geological Survey Watershed Boundary Dataset as of August 1, 2023. The Louisiana Watershed Flood Center at the University of Louisiana at Lafayette, in consultation with the office of state lands and the Coastal Protection and Restoration Authority, shall submit to the legislature a detailed legal description of the Acadiana Watershed District boundaries by January 1, 2024.
La. R.S. § 38:3321