Tex. Water Code § 16.320
The Commissioner of the General Land Office is authorized to perform all acts necessary to develop and implement a program for certification of structures subject to imminent collapse due to erosion under the National Flood Insurance Act. This program shall include administrative rules adequate to meet all erosion-related requirements of the National Flood Insurance Act, including the establishment of required erosion zones in order for the state to receive approval to administer the program. This section shall apply to any amendment of or law replacing Section 4013(c) of the National Flood Insurance Act. Except as otherwise provided by this section, all actions taken by political subdivisions under Section 16.315 of this code with respect to structures in imminent danger of collapse from coastal erosion must comply with rules and regulations adopted by the commissioner under this section. A political subdivision may adopt rules that are more stringent than those adopted by the commissioner under this section, provided the stricter provisions are intended to ensure compliance with the National Flood Insurance Program's rules, regulations, and policies.
Tex. Water Code § 16.320