La. Stat. tit. 33 § 4884
The governing authority of a local governmental subdivision may purchase, install, maintain, or replace culverts within any drain, ditch, or canal within its jurisdiction if the governing authority determines such action to be beneficial to the public at large, even if the installation of such culverts may result in a benefit to a private landowner. The governing authority may adopt ordinances regulating the installation of culverts, which may include a requirement that a private person wishing to have a culvert installed within a drain, ditch, or canal affecting his property contract with the governing authority to provide such construction services. The governing authority may only provide materials or construction services pursuant to such an ordinance upon full reimbursement of the costs to the governing authority by the private property owner.
La. R.S. § 33:4884