In the event that special assessments are voted by the electors of the district, levy for the same against the lands within such district shall be made on the completion and equalization of the assessment roll each year, which special assessment roll shall be prepared, equalized, the levy made and assessments collected at the same time and in the same manner and by the same officers that the assessment roll is prepared, equalized and assessments collected for the payment of bonds and the district board and other officers shall have the same powers and functions for the purposes of said voted special assessment as possessed by them in case of levy of assessments to pay bonds of the district.