La. Stat. tit. 33 § 3318
Any municipality proceeding under the authority of this Subpart may participate in the payment of the total costs of such project in the manner and to the extent that the governing authority of the municipality may determine, provided that any funds so used by the municipality shall be in such amounts as it may have available for such purpose and from sources other than the imposition of special assessments. Such participation by the municipality may be allocated to any one or more projects as the governing authority of the municipality may determine and the municipality may establish a reasonable formula providing adjustments and contributions for corner lots where street improvements are made on more than one side of a lot. Any contributions heretofore made by a municipality in accordance with this section are hereby ratified and confirmed.
La. R.S. § 33:3318