If, on July first following the city council's adoption of a resolution establishing the amount of the storm drainage facility fee to be assessed and levied pursuant to the provisions of this chapter, or on July first of any year thereafter, there has been an increase in the cost of constructing and installing storm drainage facilities within the city, the city manager, without any further action by the city council, shall increase the storm drainage facility fee and, where appropriate, the storm drainage facility fee credits hereinafter provided for in this chapter in an amount proportional to the increase in such costs. The determination of whether there has been an increase in the cost of constructing and installing storm drainage facilities and the amount of the increase in the storm drainage facility fee and storm drainage facility fee credits which is proportional to the increase in such costs shall be made by the city manager and shall be based exclusively on the net percentage increase during the preceding year, as published in the Caltrans Highway Construction cost index. The index used shall be a rolling three (3) year average, or prior twelve (12) quarters index average.
(Ord. 1956 §1 (part), Ord. 2521 §17)