During the period May 1st through September 30th of each year, the director of public works shall inspect all trees, structures and other things within and adjacent to streams, channels and watercourses within the city to determine whether or not any such thing constitutes a dangerous obstruction, as defined in subsection A of Section 8.12.020. Whenever he or she finds any such dangerous obstruction, he or she shall institute public nuisance abatement proceedings for the removal of such obstruction as a hazard, as provided in Chapter 8.24, in sufficient time to permit the completion of the abatement proceedings, including appeals therefrom, before November 1st of the year. (Ord. 1051 § 1 (part), 1985: prior code § 5221.4)