La. Stat. tit. 45 § 457
Whenever any parish or municipal body or department having jurisdiction or control over drainage in any parish or municipality determines that any roadbed of any railway company, operating a line or system of railroads in this state, is obstructing, retarding, or interfering with the proper natural drainage of any area or land within its parish or municipality traversed by the line or system of railroads, the railway company shall drain such roadbed, by constructing and maintaining ditches, culverts, or drains under their roadbed or under the crossings over their roadbed on their right of way, either parallel to or at angles with their roadbeds or crossings, of sufficient width, depth, and capacity to carry off water rapidly, and in such a manner as the railway company may be notified to do by the parish or municipal body or department. The railway companies shall do all things necessary to relieve such obstructed natural drainage without delay whenever so notified. The provisions of this Part relating to the rights of the owner of the land, improvements constructed or to be constructed thereon, farm, or plantation shall apply to and in favor of any parish or municipal body or department covered by this Section.
La. R.S. § 45:457