The district is composed of the territory described by Section 1, Chapter 244, Acts of the 58th Legislature, Regular Session, 1963 (Article 8280-286, Vernon's Texas Civil Statutes), as that territory may have been modified under:
(1) Chapter 3A, Title 128, Revised Statutes, before August 30, 1971;
(2) Subchapter O, Chapter 51, Water Code;
(3) Subchapter J, Chapter 49, Water Code; or
(4) other law.