(a) If bonds are issued payable wholly or partly from ad valorem taxes, the board shall annually impose a tax on the taxable property in the authority in an amount sufficient to pay the principal of and interest on the bonds when due but not to exceed 20 cents on the $100 valuation of taxable property in the authority.
(b) The board may adopt the rate of a tax imposed under Subsection (a) for any year after giving consideration to the money received from the pledged revenue that may be available for payment of principal and interest, to the extent and in the manner permitted by the resolution authorizing the issuance of the bonds.