In this chapter:
(1) "Artificial reef" means a structure or system of structures constructed, placed, or permitted in water covered under this chapter for the purpose of enhancing fishery resources and commercial and recreational fishing opportunities.
(2) "National Fishing Enhancement Act" means Title II of Public Law No. 98-623, enacting 16 U.S.C. Section 1220d and 33 U.S.C. Sections 2101 through 2106 and amending 16 U.S.C. Sections 1220 through 1220c.
(3) "Reef materials" includes only materials allowed under the national artificial reef plan adopted under the National Fishing Enhancement Act for construction of artificial reefs.
(4) "Water covered under this chapter" means the navigable water of Texas and water of the federal fisheries conservation zone adjacent to Texas water.