(a) All counties and cities bordering on the coast of the Gulf of Mexico are hereby authorized upon a vote of the majority of the qualified voters voting thereon at an election called for such purpose to levy and collect such tax for construction of sea walls, breakwaters, or sanitary purposes, as may now or may hereafter be authorized by law, and may create a debt for such works and issue bonds in evidence thereof. But no debt for any purpose shall ever be incurred in any manner by any city or county unless provision is made, at the time of creating the same, for levying and collecting a sufficient tax to pay the interest thereon and provide at least two per cent (2%) as a sinking fund, except as provided by Subsection (b); and the condemnation of the right of way for the erection of such works shall be fully provided for.
(b) To increase efficiency and effectiveness to the greatest extent possible, the legislature may by general law authorize cities or counties to enter into interlocal contracts with other cities or counties without meeting the tax and sinking fund requirements under Subsection (a).