After the Board has made its determination of the matters required to be determined by the resolution of formation, and if the board deems it necessary to incur the bonded indebtedness, the board shall by a futher resolution call a special election in the improvement district for the purpose of submitting to the voters thereof the proposition of incurring indebtedness by the issuance of bonds of the district for the improvement district.
Ca. Water Code § 71900