The rural water assistance fund is a special fund in the state treasury. The fund consists of:
(1) money directly appropriated to the board for a purpose of the fund;
(2) repayment of principal and interest from loans made from the fund not otherwise needed as a source of revenue pursuant to § 17.9615(b);
(3) money transferred by the board from any sources available;
(4) interest earned on the investment of money in the fund and depository interest allocable to the fund;
(5) money transferred to the fund from the water assistance fund in accordance with § 15.011(b), including proceeds from the sale of political subdivision bonds by the board to the Texas Water Resources Finance Authority that are deposited in the water assistance fund as provided by § 17.0871;
(6) money from gifts, grants, or donations to the fund;
(7) money disbursed to the fund from the state water implementation fund for Texas as authorized by § 15.434; and
(8) any other fees or sources of revenue that the legislature may dedicate for deposit to the fund.