The governing body of a municipality after joining an authority and after determination by the authority pursuant to planning studies may by ordinance provide for the assessment of an annual levy not to exceed twenty-seven cents per one thousand dollars of assessed value upon all the taxable property in such municipality for a period not to exceed forty years as shall be agreed by the member municipalities or for such longer time as any revenue bonds of an authority shall be outstanding or until such municipality withdraws from the authority, whichever is sooner. A county which is a member municipality may levy such tax only upon the property in the unincorporated area of such county. Such tax may be levied in excess of any tax limitation imposed by statute. Such ordinance shall be enacted only after publication of notice and hearing in the manner prescribed in section 330A.6. Upon such enactment, a copy thereof shall be certified to the authority. An authority shall have the power to enforce the collection of such levy by mandamus or other appropriate remedy and such levy shall be collected in the manner other taxes are collected and allocated and paid to the authority for the exclusive and proper use of the authority, including but not limited to the purchase of land, and the acquiring, establishing, constructing, enlarging, operating, and maintaining of aviation facilities. In addition to the purposes listed above, moneys in said fund may be pledged to the payment of the principal, interest, and redemption premium, if any, on bonds of the authority. Money paid to the authority pursuant to this section shall be deposited by the authority in a special trust fund to be called the “…………………… Authority Capital Reserve Fund”. Member municipalities may, in addition, deposit money from current operating funds in the capital reserve fund pursuant to agreement for the purpose of providing initial funds to the authority to be used for funding studies, plans, and other expenses of an authority pending receipt of funds from the annual levy herein authorized. Any such money so deposited shall be considered a gift and is not repayable.