Ala. Code § 41-10-516
For the purpose of providing funds for the payment of the principal of and interest on the bonds issued by the authority under the provisions of this article, there is hereby created and irrevocably pledged to the payment of such obligations a special and continuing trust fund which shall consist of all receipts and income from rents contracted for and received by the authority under leases of the facility or facilities constructed with the proceeds from the sale of the bonds. There shall be created within said special and continuing trust fund a reserve fund account of said authority in the State Treasury in which shall be placed as trust fund and held separate and apart from all other moneys of the state or of the authority, (1) any moneys left after the completion of the facility and the payment of all costs in connection therewith and in connection with the issuance of the bonds, and, (2) all excess rentals and other surplus income from the facility or facilities constructed with the proceeds from the sale of the bonds remaining each fiscal year after payment of all charges and expenses of operating and maintaining such facility or facilities during such fiscal year, including all payments required to be made during such fiscal year with respect to the bonds issued for such facility or facilities. Said reserve fund shall be held by the State Treasurer in trust for the authority and the holders of its bonds and may be invested at the direction of the authority. Said reserve fund shall be used to pay, when due and payable, any installment of principal or interest or both on the bonds for which said fund was created which cannot be paid out of current revenues or other moneys of the authority. Said funds shall not be diverted or used for any other purpose. There shall also be created in said special and continuing trust fund an account thereof in which shall be deposited, segregated and held only the amounts reasonably estimated to be necessary for the maintenance, operation and upkeep of said facilities with all excess moneys at the end of each fiscal year being transferred to the reserve fund.
Ala. Code § 41-10-516 (1975)