Ala. Code § 11-81-162

Whenever the governing body of any borrower shall determine to acquire, improve, enlarge, extend or repair a system or systems under the provisions of this article, it shall first cause an estimate to be made of the cost thereof, and the fact that such estimate has been made and the amount thereof shall appear in the authorizing proceedings providing for the issuance of the bonds proposed to be issued to finance such acquisition, improvement, enlargement, extension or repair.