(a) This section applies only to a county with a population of 3.3 million or more.
(b) If, in connection with a project under this chapter, the commissioners court of the county authorizes the county to proceed in the manner provided by § 203.066:
(1) the county may file a declaration of taking and proceed in the manner provided by that section on the project; and
(2) a reference to the department in that section means the county.