(a) The district is composed of the territory described by Section 1, Chapter 120, Acts of the 60th Legislature, Regular Session, 1967, as that territory may have been modified under:
(1) Subchapter D or its predecessor statute, Section 4a, Chapter 120, Acts of the 60th Legislature, Regular Session, 1967; or
(2) other law.
(b) The legislature finds that the boundaries and field notes of the district contained in Section 1, Chapter 120, Acts of the 60th Legislature, Regular Session, 1967, form a closure. A mistake in the field notes or in copying the field notes in the legislative process does not affect:
(1) the organization, existence, or validity of the district;
(2) the right of the district to issue bonds;
(3) the right of the district to impose taxes; or
(4) the legality or operation of the district in any other manner.