Tex. Water Code § 5.707
Notwithstanding any law that provides specific purposes for which a fund, account, or revenue source may be used and expended by the commission and that restricts the use of revenues and balances by the commission, the commission may transfer a percentage of appropriations from one appropriation item to another appropriation item consistent with the General Appropriations Act for any biennium authorizing the commission to transfer a percentage of appropriations from one appropriation item to another appropriation item. The use of funds in dedicated accounts under this section for purposes in addition to those provided by statutes restricting their use may not exceed seven percent or $20 million, whichever is less, of appropriations to the commission in the General Appropriations Act for any biennium. A transfer of $500,000 or more from one appropriation item to another appropriation item under this section must be approved by the commission at an open meeting subject to Chapter 551, Government Code.
Tex. Water Code § 5.707