Texas Special District Local Laws Code - SDLL § 8506.154. Rates and other charges

(1) pay all expenses necessary to the operation and maintenance of the properties and facilities of the authority;

(2) pay the interest on and the principal of all bonds issued under this chapter or its predecessor statute when and as they become due and payable;

(3) pay all sinking fund or reserve fund payments agreed to be made with respect to bonds issued under this chapter or its predecessor statute and payable out of that revenue when and as they become due and payable; and

(4) fulfill the terms of any agreements made with the holders of bonds issued under this chapter or its predecessor statute or with any person in their behalf.