La. Stat. tit. 33 § 7708
Any consolidated special service district created hereunder, in addition to its right to issue bonds or other obligations for the purposes and in the manner elsewhere provided in the constitution and laws of this state, may issue its refunding bonds for the purpose of refunding any outstanding revenue bonds or obligations of one or more of its underlying districts or, in its discretion, may authorize and deliver a single issue of revenue bonds for both improvement and refunding purposes. Refunding bonds so authorized shall be authorized and issued in the manner provided by law for the issuance of the bonds or other obligations refunded and shall be secured in the same manner as the bonds or obligations refunded, except that the governing authority, in its discretion, may provide for changes in the source of payment of such bonds or obligations as it considers desirable, and except that any refunding bonds so authorized either may be sold and the funds realized from the sale thereof applied exclusively to the payment of the bonds or obligations refunded or may be delivered in exchange for a like principal amount of the bonds or obligations refunded or may be sold in part or exchanged in part. Such refunding bonds also may be sold and the proceeds thereof escrowed to be used in paying the bonds or obligations refunded on the date on which they become payable through maturity or call for redemption. Refunding bonds so issued shall not exceed in principal amount the principal amount of the bonds or obligations to be so refunded.
La. R.S. § 33:7708