Should the assessments in any special assessment roll, including the amount assessed to the City at large, prove insufficient for any reason to pay the cost of the improvement for which they were made, then the Council shall make additional assessments against the City and the several lots and parcels of land, in the same ratio as the original assessments, to supply the deficiency; but the total amount assessed against any lot or parcel of land shall not exceed the value of the benefits received from the improvement, provided that the additional pro-rata assessment shall not exceed twenty-five percent of the assessment as originally confirmed unless a meeting of the Council be held to review such additional assessment, for which meeting notices shall be mailed as provided in the case of review of the original special assessment roll.
(1981 Code § 1.171)