30 Tex. Admin. Code § 295.41
Except where written approval of the executive director has been obtained, application plans for dam and reservoir projects, and plats and reports submitted in connection therewith, shall be prepared by a registered professional engineer as defined in the Texas Engineering Practice Act (Texas Civil Statutes, Article 3271a). Such plans, plats, and reports shall bear a certificate, signed by the engineer and to which the engineer's seal shall be affixed, stating that the application plans, plats, and/or reports were prepared by the engineer or under the engineer's direct supervision. The certificate and seal shall be affixed to each sheet of plans and plats, or the first sheet shall contain certification that a specified number of sheets following were prepared by the engineer or under the engineer's direct supervision. Affixing the certificate and seal once within a report shall be sufficient. The following certificate form should be used.
30 Tex. Admin. Code § 295.41