Tex. Water Code § 51.511: AUTHORITY TO ADOPT ALTERNATIVE PLANS OF TAXATION.

A district operating under the provisions of Article XVI, Section 59, of the Texas Constitution, shall adopt a tax plan under the alternative provisions of Sections 51.512-51.530 of this code either at the time of its creation or before the appointment of commissioners of appraisement under this chapter.

Acts 1971, 62nd Leg., p. 351, ch. 58, Sec. 1, eff. Aug. 30, 1971.