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A. The service charges shall be based on the relative contribution of increased surface and storm water runoff from a given parcel to the surface and storm water management system. The percentage of impervious surfaces on the parcel and the total parcel acreage shall be used to indicate the relative contribution of increased surface and storm water runoff from the parcel to the surface and storm water management system. The relative contribution of increased surface and storm water runoff from each parcel shall 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 council, of the cost of surface and storm water management services or to pay or secure the payment of all or any portion of any issue of general obligation or revenue bonds issued for such purpose.

B. The service charge for each parcel within the service area shall be determined under the following methodology: Residential and very lightly developed nonresidential parcels shall receive a flat service charge for the reasons set forth in BMC 18.10.100. Parcels shall be classified into the appropriate rate category by their percentage of impervious surface coverage. Data collected from parcel investigations shall 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 shall be calculated by multiplying the total acreage of the parcel times the rate for that category. (Ord. 2023 § 1 (Exh. A), 2009; Ord. 1634 § 1, 1996).