The city commission shall further have authority to issue revenue bonds, duly authorized by the majority vote of qualified resident taxpaying voters, for the purpose of building, purchasing, improving, enlarging, extending or repairing its water system, sewer system, or any other public utility which it may own or hereafter acquire, either both or all, or any other self liquidating asset for which revenue bonds may lawfully be issued, and to mortgage or encumber any such system or systems and to pledge the income and revenue thereof for any such purpose, all in accordance with the power and authority provided in Article 1111 through 1118 and all subsections thereof, of the Revised Civil Statutes of Texas of 1925, as amended or hereafter amended.
(Charter Amnd. No. 9, ratified May 6, 1969)