30 Tex. Admin. Code § 295.11
Except as otherwise provided herein, if an existing reservoir inundates land owned by more than one person, an application for a permit to authorize the dam and reservoir and to use state water impounded in the reservoir shall be joined by all of the landowners. A copy of any operating agreement affecting the reservoir or the distribution of water therefrom shall be submitted with the application. If there is incomplete joinder, the applicant shall submit the name and address of any landowner who does not join the application, and shall file a copy of an easement or a consent, license, lease, or other type of agreement from the landowner(s), as provided in § 295.10 of this title (relating to Proposed Installation or Reservoir).
30 Tex. Admin. Code § 295.11