Ala. Code § 9-9-38
The board of water management commissioners may sell the bonds for cash at not less than 95 percent of the par value plus accrued interest and devote the proceeds to the payment of the work as it progresses and to the payment of other expenses of the district provided for in this article and for no other purpose or purposes. The funds of the district derived from the sale of bonds, collection of taxes or any other source shall be placed in any such depositories as may be designated by the board of water management commissioners, and the depositories shall pay into the treasury of the district such rate of interest as may be mutually agreed upon between the depository and the board of water management commissioners; provided, that the rate of interest shall not be less than two percent per annum and that the funds shall be subject to withdrawal at any time by the commissioners for the payment of the obligations of the district.
Ala. Code § 9-9-38 (1975)