The board, if it declares by resolution that the proposed plan of the project is satisfactory and that the plan is feasible, shall adopt an order determining the amount of bonds that should be issued to raise the money necessary to complete the proposed project. Construction bonds in an amount fixed in the order determining the amount in which they should be issued shall not be issued unless their issuance is authorized at a bond election, and the bonds in the amount fixed shall be issued when their issuance is authorized at a bond election.