Tex. Water Code § 11.025
Current with legislation from the 2023 Regular and Special Sessions signed by the Governor as of November 21, 2023.
A right to use state water under a permit or a certified filing is limited not only to the amount specifically appropriated but also to the amount which is being or can be beneficially used for the purposes specified in the appropriation, and all water not so used is considered not appropriated.
Tex. Water Code § 11.025