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A. Generally. The rate adjustment used to compute the monthly service charge for parcels shall be determined by taking the coverage factors set forth in subsection B of this section and adding or subtracting any applicable water quality and quantity credits, and any special program adjustment, as determined under subsections C and D of this section. Parcels served by multiple water quality or quantity facilities will have the rate adjustment calculated based on the percentage of area treated by each facility.

B. Coverage Factor.

For Impervious Surface Expressed as a Percentage of Total Parcel Area Over Rate Adjustment Is

30%

+ 1.10

40%

+ 1.20

50%

+ 1.30

60%

+ 1.40

70%

+ 1.50

80%

+ 1.60

90%

+ 1.70

Portions of a parcel receiving an infiltration or dispersion credit shall receive a coverage factor of 1. The remainder of the parcel will receive a coverage factor based on the entire parcel.

C. Water Quantity and Quality Credits:.

1. Quantity Credits.

Description

Examples

Credit

High Performance

Designed systems that prevent the majority of runoff from leaving the site.

• Rainwater Harvesting and Reuse

-0.4

• Full infiltration or dispersion

• LID Performance Standard + Flow Control

Full Control

Designed systems that control the majority of runoff from the site.

• Detention (2001 Standard)

-0.2

• Private Direct Discharge

• Infiltration (91% annual runoff volume)

Partial Control

Designed systems that partially control the runoff from the site.

• Detention (1992 Standard)

-0.1

• Rainwater Harvesting (State Definition)

Other Control

Designed systems that reduce or control runoff in some manner but do not meet the criteria above. Typically older systems.

• Other designed flow control

-0.05

• Other designed infiltration

• LID Performance Standard

2. Quality Credits.

Description

Examples

Credit

Advanced

Designed system that separates runoff from nonpollution generating surfaces.

Infiltration of nonpollution generating surfaces

-.2

Rainwater Harvesting and Reuse

Enhanced

Designed system that removes sediment, metals, and/or phosphorus to current ecology standard.

Enhanced Treatment

-.15

Basic

Designed system that removes sediment to current ecology standard.

Basic Treatment

-.1

Other Treatment

Designed systems that improve or monitor water quality in some manner but do not meet the criteria above.

State or City Required Monitoring

-.05

Oil/Water Separator

Other designed water quality

D. Special Programs. Adjustments for special programs may be determined on a case-by-case contractual basis upon approval by the City Council.

E. Because developed city rights-of-way provide surface drainage, access to the storm drain pipes and overflow routes for storm water in many areas, such developed rights-of-way shall have a fixed single rate adjustment of 0.3, notwithstanding any other provision of this section.

F. Repealed by Ord. 2864.

G. The credits set forth in this section shall apply only if the on-site facilities for which a reduction in the rate adjustment is given met applicable standards upon installation, received approval of construction, and have been and are maintained and operated in accord with city standards applicable at the time of billing. In the event that the administrator of the utility determines that the operation and maintenance standards are not complied with, no reduction in the rate adjustment shall be made for water quantity, water quality, or special programs for a minimum of one year and until operation and maintenance do meet city standards, whereupon the person being billed may reapply for system inspection and for application of the special programs, water quantity and/or quality credits.

H. Developed rights-of-way designated as state highways shall have a fixed single rate adjustment of 0.3, notwithstanding any other provision of this section. (Ord. 2864 § 2 (part), 2016: Ord. 2794 § 2, 2015; Ord. 2464 § 3 (part), 2009: Ord. 1823 § 2, 1995; Ord. 1433 § 2 (part), 1988).