If an assessment is made before the total cost of the improvement is determined, and if the amount of the assessment is insufficient to defray expenses of the improvement, the council may declare the insufficiency by motion and prepare a proposed supplemental assessment. The council shall set a time for hearing objections to the supplemental assessment and direct the city manager to publish one notice of the hearing in a newspaper of general circulation in the city. After the hearing the council shall make a just and equitable supplemental assessment by ordinance, which shall be entered in the docket of liens as provided by section 5-1-11 of this chapter. Notice of the supplemental assessment shall be published and mailed, and collection of the assessment shall be made, in accordance with sections 5-1-11 and 5-1-12 of this chapter. (Ord. 681, 3-25-1985)