A.   The complete special assessment procedure to be used, including the preparation of plans and specifications; estimation of costs; the preparation, hearing and correction of the special assessment roll; the collection of special assessments; the assessment of single lots or parcels; and any other matters concerning the making of improvements by the special assessment method, shall be provided by ordinance.
   B.   The ordinance shall authorize additional assessments, if the prior assessment proves insufficient to pay for the improvement or is determined to be invalid in whole or in part, and shall also provide for the disposition of excess assessments.
(Adopted by the electorate, 11-5-1974)