After the board has made its determination of the matters required to be determined by the resolution of intention, and if the board deems it necessary to form the improvement district and to incur the bonded indebtedness, the board shall by a formation resolution call a special election in the proposed uninhabited improvement district for the purpose of submitting to the voters thereof the proposition of forming the uninhabited improvement district and incurring indebtedness by the issuance of bonds of the district for the uninhabited improvement district.