La. Stat. tit. 33 § 4253
Any bonds issued under this Sub-part shall be payable from and secured by the pledge of the revenues derived from the operation of the utility constructed, acquired, extended or improved with the proceeds thereof, subject only to the prior payment of the reasonable and necessary expenses of operating and maintaining the utility. Any holder of the bonds or of any of the coupons thereto attached may by appropriate legal action compel performance of all duties required of the governing body and officials of the municipal corporation by the provisions of this Sub-part. If any bond issued hereunder is permitted to go into default as to principal or interest, any court of competent jurisdiction may pursuant to the application of the holder of the bond, appoint a receiver for the utility, which receiver shall be under the duty of operating the utility and collecting and distributing the revenues thereof pursuant to the provisions and requirements of the resolution authorizing the bonds.
If more than one series of bonds is issued hereunder payable from the revenues of any utility, priority of lien on such revenues shall depend on the time of the delivery of the bonds, each series enjoying a lien prior and superior to that enjoyed by any series of bonds subsequently delivered, except that where provision is made in the proceedings authorizing any issue or series of bonds for the issuance of additional bonds in the future on a parity therewith pursuant to procedure or restrictions provided in such proceedings, additional bonds may be issued in the future on a parity with such issue or series in the manner so provided in such proceedings.
La. R.S. § 33:4253