Iowa Code § 28F.9
The entity may borrow money for the purposes for which bonds may be issued, in anticipation of the receipt of the proceeds of the sale of bonds. Notes shall be issued for moneys borrowed under this section, and the notes may be renewed. The notes shall be authorized by resolution of the governing body of the entity and may be issued in denominations, bear interest at rates not exceeding the maximum rate of interest permitted by chapter 74A for pledge orders issued by a city, shall be in a form and shall be executed in a manner, all as the entity prescribes. If the notes are renewal notes, they may be exchanged for notes then outstanding on terms the governing body of the entity determines. Notes may be sold at public or private sale or may be issued to persons furnishing materials and services constituting a part of the cost of the acquisition, construction, reconstruction, repair, extension or improvement of a project. The governing body of the entity may retire any notes from the revenues derived from the project or from other moneys of the entity which are lawfully available for that purpose or from a combination of each, in lieu of retiring them by means of bond proceeds.
Iowa Code § 28F.9