In this subchapter:
(1) "Acquiring agency" means the Parks and Wildlife Department.
(2) "Land office " means the General Land Office.
(3) "Coastal wetland" means wetlands underlying or adjacent to tidal waters in the coastal area.
(4) "Wetlands" has the meaning assigned under Subchapter J, Chapter 11, Water Code.
(5) "Seawater" means any water containing a concentration of one-twentieth of one percent or more by weight of total dissolved inorganic salts derived from the marine water of the Gulf of Mexico.