Tex. Water Code § 60.349

This subchapter shall be wholly sufficient authority within itself for the issuance of the bonds and the performance of the other acts and procedures authorized by it, without reference to any other laws, or any restrictions or limitations contained therein, except as specifically provided in this subchapter. When any bonds are being issued under this subchapter, then to the extent of any conflict or inconsistency between any provisions this subchapter shall prevail and control; provided, that any issuer shall have the right to use the provisions of any other laws, not in conflict with the provisions of this subchapter, to the extent convenient or necessary to carry out any power or authority, express or implied, granted by this subchapter.