Tex. Water Code § 11.133

At the time and place stated in the notice, the commission shall hold a hearing on the application. Any person may appear at the hearing in person or by attorney or may enter his appearance in writing. Any person who appears may present objection to the issuance of the permit. The commission may receive evidence, orally or by affidavit, in support of or in opposition to the issuance of the permit, and it may hear arguments.