Louisiana constitution
Article 6
Section 39

(C) Districts Created After January 1, 2006. For any purpose set forth in Paragraph (A) of this Section, the governing authority of a levee district created after January 1, 2006, may annually levy a tax on all property not exempt from taxation situated within the alluvial portions of the district subject to overflow. However, such a district shall not levy such a tax nor increase the rate of such a tax unless the levy or the increase is approved by a majority of the electors of the district who vote in an election held for that purpose. If the district is composed of territory in more than one parish, approval by a majority of the electors who vote in each parish comprising the district is also required for any such levy or increase.