Tex. Water Code § 42.007

The commissioner may employ engineering, legal, and clerical personnel as necessary to protect the interest of the state and to carry out and enforce the terms of the compact. He may incur necessary office expenses and other expenses incident to the proper performance of his duties and the proper administration of the compact. However, the commissioner shall not incur any financial obligation on behalf of this state until the legislature has authorized and appropriated money for the obligation.