Tex. Water Code § 17.011

(a) The board, by resolution, from time to time may provide for the issuance of negotiable bonds in an aggregate amount not to exceed $400 million pursuant to Article III, Section 49-c and Section 49-d, of the Texas Constitution, and the issuance of additional negotiable bonds in an aggregate amount not to exceed $200 million pursuant to Article III, Section 49-d-1, of the Texas Constitution, not to exceed $980 million pursuant to Article III, Section 49-d-2, of the Texas Constitution, not to exceed $400 million pursuant to Article III, Section 49-d-6, of the Texas Constitution, and not to exceed $500 million pursuant to Article III, Section 49-d-7, of the Texas Constitution.

(b) The board, by resolution, from time to time may provide for the issuance of negotiable bonds in an aggregate amount of not to exceed the total principal amount the board has obligated the Texas Water Development Fund for the acquisition of storage facilities by the execution of a contract with the United States or any of its agencies under Article III, Section 49-d, of the Texas Constitution, and to the extent the bond proceeds are utilized to reduce the board's obligation under a contract with the United States or any of its agencies under Article III, Section 49-d, of the Texas Constitution, the bonds may not be considered in determining the aggregate amount of bonds issued under Article III, Sections 49-c, 49-d, 49-d-2, 49-d-6, and 49-d-7, of the Texas Constitution, in addition to the contract with the United States or any of its agencies.

(c) Notwithstanding any other provision of this section, the board by resolution may issue water financial assistance bonds for any one or more of the purposes described in Section 49-d-8, Article III, Texas Constitution, in an aggregate principal amount not to exceed the amount of bonds authorized by Section 49-d-8, Article III, Texas Constitution, in accordance with the provisions of Subchapter L.