La. Stat. tit. 38 § 1544
Any drainage district or sub-drainage district organized prior to the adoption of the Constitution of 1921, and not reorganized under the provisions of the Constitution of 1921, and the laws carrying same into effect, which have heretofore, upon petition of the property taxpayers and in accordance with the provisions of Section 3 of Article 281 of the Constitutions of 1898 and 1913, and the laws carrying the Constitutions into effect, incurred debts against the lands within the drainage district or sub-drainage district, for the purpose of reclaiming the lands therein, and issued negotiable bonds to represent the indebtedness, may, for the purpose of readjusting, funding, refunding, extending or unifying any or all of its authorized indebtedness, bonded or otherwise, or both, issue and sell funding or refunding bonds, and with the proceeds of the sale thereof pay the indebtedness, or may exchange the funding or refunding bonds with the holders of the outstanding indebtedness, bonded or otherwise, in payment thereof, all in the manner as hereinafter provided.
La. R.S. § 38:1544