The council adopts that certain methodology for computation of a storm water conveyance systems development charge as is set out in the report by Economic and Engineering Services dated June 2, 2000. The charge shall consist of an Improvement Fee of $726, that amount reflecting the Engineering News Record Construction Cost Index for the period September 1994 to January 1999. Effective February 1, 2003, the charge shall consist of an Improvement Fee reflecting the increase in the same index for the period February 1999 to December 2002. Effective February 1, 2004, and on February 1 of each calendar year thereafter, the SDC shall be increased to reflect the total increase in the same index for the preceding calendar year. The council from time to time may adopt a new methodology and impose a new improvement or reimbursement fee or both for a storm water conveyance systems development charge by amendment to this ordinance. [BC 4.07.085, added by Ordinance No. 3910, 8/22/94; amended by Ordinance No. 4195 § 2]