(1) The service charges shall be based on the relative contribution of increased surface and stormwater runoff from a given parcel to the surface and stormwater management system. The percentage of impervious surfaces on the parcel and the total parcel acreage will be used to indicate the relative contribution of increased surface and stormwater runoff from the parcel to the surface and stormwater management system. The relative contribution of increased surface and stormwater runoff from each parcel will determine that parcel’s share of the service charge revenue needs. The service charge revenue needs of the program are based upon all or any part, as determined by the City Council, of the cost of surface and stormwater management services or to pay or secure the payment of all or any portion of any issue of bonds issued for that purpose.

(2) The Public Works Department shall determine the service charge for each parcel within the service area by the following methodology: residential and very lightly developed nonresidential parcels shall receive a flat rate service charge for the reasons set forth in CMC 13.30.050(7). Light to very heavily developed parcels shall be classified into the appropriate rate category by their percentage of impervious surface coverage. Land use codes or data collected from parcel investigations, or both, will be used to determine each parcel’s percentage of impervious surface coverage. After a parcel has been assigned to the appropriate rate category, the service charge for the parcel will be calculated by multiplying the total acreage of the parcel times the rate for that category.

(3) There are hereby imposed upon all developed properties in the service area annual service charges as set forth in the current fee resolution.

(4) The City Council will review the surface water management service charges annually to ensure the long-term fiscal viability of the program and to guarantee that debt covenants are met. The program will use equitable and efficient methods to determine service charges. (Amended at request of department 2/08; Ord. 20-07 § 48; Ord. 37-02 § 2 (9.08.070))