The following words and terms, when used in this chapter, shall have the following meanings, unless the context clearly indicates otherwise.(1) Inks Lake water quality area--Those portions of the Inks Lake Watershed within 10 stream miles of the normal operating pool elevation of Inks Lake (888 feet, mean sea level).(2) Inks Lake watershed--Inks Lake and its tributaries located between Roy Inks Dam and Buchanan Dam.(3) Lake Buchanan water quality area--Those portions of the Lake Buchanan Watershed within 10 stream miles of the normal operating pool elevation of Lake Buchanan (1,020 feet, mean sea level).(4) Lake Buchanan watershed--Lake Buchanan and its tributaries located between Buchanan Dam and the confluence of the Colorado River and Deep Creek near the convergence of the Brown, McCulloch, and San Saba County lines.