Ala. Code § 45-25-250.06
As security for payment of the principal of and interest on bonds or obligations assumed by it, the authority may enter into a contract or contracts binding itself for the proper application of the proceeds of bonds and other funds, for the continued operation and maintenance of any water, sewer, or garbage system owned by it or any part or parts thereof, for the imposition and collection of reasonable rates for and the promulgation of reasonable regulations respecting any service furnished from any such system or facility, for the disposition and application of its gross revenues or any part thereof and for any other act or series of acts not inconsistent with this article for the protection of the bonds and other obligations being secured and the assurance that the revenues from such system or facility will be sufficient to operate such system or facility, maintain the same in good repair and in good operating condition, pay the principal of and interest on any bonds payable from such revenues and maintain such reserves as may be deemed appropriate for the protection of the bonds, the efficient operation of such system or facility and the making of replacements thereof and capital improvements thereto. Any contract pursuant to the provisions of this section may be set forth in any resolution of the board authorizing the assumption of obligations or in any mortgage and deed of trust or trust indenture made by the authority under this article.
Ala. Code § 45-25-250.06 (1975)