Tex. Const. art. III, § 49-d-12

(a) The State Water Implementation Fund for Texas is created as a special fund in the state treasury outside the general revenue fund. Money in the State Water Implementation Fund for Texas shall be administered, without further appropriation, by the Texas Water Development Board or that board's successor in function and shall be used for the purpose of implementing the state water plan that is adopted as required by general law by the Texas Water Development Board or that board's successor in function. Separate accounts may be established in the State Water Implementation Fund for Texas as necessary to administer the fund or authorized projects.

(b) The legislature by general law may authorize the Texas Water Development Board or that board's successor in function to enter into bond enhancement agreements to provide additional security for general obligation bonds or revenue bonds of the Texas Water Development Board or that board's successor in function, the proceeds of which are used to finance state water plan projects. Bond enhancement agreements must be payable solely from the State Water Implementation Fund for Texas; provided, however, the bond enhancement agreements may not exceed an amount that can be fully supported by the State Water Implementation Fund for Texas. Any amount paid under a bond enhancement agreement may be repaid as provided by general law; provided, however, any repayment may not cause general obligation bonds that are issued under Sections 49-d-9 and 49-d-11 of this article and that are payable from the fund or account receiving the bond enhancement payment to be no longer self-supporting for purposes of Section 49-j(b) of this article. Payments under a bond enhancement agreement entered into pursuant to this section may not be a constitutional state debt payable from general revenues of the state.

(c) The legislature by general law may authorize the Texas Water Development Board or that board's successor in function to use the State Water Implementation Fund for Texas to finance, including by direct loan, water projects included in the state water plan.

(d) The Texas Water Development Board or that board's successor in function shall provide written notice to the Legislative Budget Board or that board's successor in function before each bond enhancement agreement or loan agreement entered into pursuant to this section has been executed by the Texas Water Development Board or that board's successor in function and shall provide a copy of the proposed agreement to the Legislative Budget Board or that board's successor in function for approval. The proposed agreement shall be considered to be approved unless the Legislative Budget Board or that board's successor in function issues a written disapproval not later than the 21st day after the date on which the staff of that board receives the submission.

(e) The State Water Implementation Fund for Texas consists of:

(1) money transferred or deposited to the credit of the fund by general law, including money from any source transferred or deposited to the credit of the fund at the discretion of the Texas Water Development Board or that board's successor in function as authorized by general law;

(2) the proceeds of any fee or tax imposed by this state that by statute is dedicated for deposit to the credit of the fund;

(3) any other revenue that the legislature by statute dedicates for deposit to the credit of the fund;

(4) investment earnings and interest earned on amounts credited to the fund; and

(5) money transferred to the fund under a bond enhancement agreement from another fund or account to which money from the fund was transferred under a bond enhancement agreement, as authorized by general law.

(f) The legislature by general law shall provide for the manner in which the assets of the State Water Implementation Fund for Texas may be used, subject to the limitations provided by this section. The legislature by general law may provide for costs of investment of the State Water Implementation Fund for Texas to be paid from that fund.

(g) As provided by general law, each fiscal year the Texas Water Development Board or that board's successor in function shall set aside from amounts on deposit in the State Water Implementation Fund for Texas an amount that is sufficient to make payments under bond enhancement agreements that become due during that fiscal year.

(h) Any dedication or appropriation of amounts on deposit in the State Water Implementation Fund for Texas may not be modified so as to impair any outstanding obligation under a bond enhancement agreement secured by a pledge of those amounts unless provisions have been made for a full discharge of the bond enhancement agreement.

(i) Money in the State Water Implementation Fund for Texas is dedicated by this constitution for purposes of Section 22, Article VIII, of this constitution and an appropriation from the economic stabilization fund to the credit of the State Water Implementation Fund for Texas is an appropriation of state tax revenues dedicated by this constitution for the purposes of Section 22, Article VIII, of this constitution.

(j) This section being intended only to establish a basic framework and not to be a comprehensive treatment of the State Water Implementation Fund for Texas, there is hereby reposed in the legislature full power to implement and effectuate the design and objects of this section, including the power to delegate such duties, responsibilities, functions, and authority to the Texas Water Development Board or that board's successor in function as the legislature believes necessary.