(a) The Economically Distressed Areas Interest and Sinking Fund is a special fund in the State Treasury to be used to pay debt service on bonds issued for the purposes provided by Subchapter K of this chapter. The fund is composed of:
(1) proceeds from the sale of political subdivision bonds to the Texas Water Resources Finance Authority in amounts provided by the General Appropriations Act;
(2) money provided by the federal government, the state, counties, or other local governmental entities and by private entities for the purpose of paying debt service on bonds issued for purposes provided by Subchapter K of this chapter; and
(3) any other money deposited to the credit of the fund.
(b) Money shall be paid into the economically distressed areas interest and sinking fund from sources specified in Subsection (a) of this section in amounts sufficient to:
(1) pay the interest coming due on all outstanding bonds during the ensuing fiscal year;
(2) pay the principal on all bonds that mature during the ensuing fiscal year, plus collection charges and exchanges on bonds; and
(3) establish a reserve equal to the average annual principal and interest requirements on all outstanding bonds.