Tex. Water Code § 17.074
The Texas Water Development Bonds Interest and Sinking Fund, referred to as the "interest and sinking fund," is a special fund in the State Treasury into which there shall be paid, from sources specified in this chapter, amounts other than amounts required to be paid into the economically distressed areas interest and sinking fund sufficient to:
Amended by Acts 1977, 65th Leg., p. 2207, ch. 870, Sec. 1, eff. Sept. 1, 1977;
Acts 1987, 70th Leg., ch. 1103, Sec. 1, eff. Sept. 1, 1987;
Acts 1989, 71st Leg., ch. 624, Sec. 2.16.