Chapter 13.18
STORMWATER MANAGEMENT UTILITY

Sections:

13.18.010    Stormwater management utility created – Responsibilities.

13.18.020    Administrator of utility.

13.18.030    Ownership of city stormwater facilities and assets.

13.18.040    Rates and charges – Definitions.

13.18.050    System of charges.

13.18.060    Rate adjustment.

13.18.070    Authority to promulgate rules.

13.18.080    Repealed.

13.18.010 Stormwater management utility created – Responsibilities.

There is created and established pursuant to Chapters 35A.80 and 35.67 RCW a storm and surface water utility to be known as the “Redmond Stormwater Management Utility.” All references to “the utility” in this chapter refer to the Redmond Stormwater Management Utility. The utility will have primary authority and responsibility for carrying out the city’s comprehensive drainage and storm sewer plan, including responsibilities for planning, design, construction, maintenance, administration, and operation of all city storm and surface water facilities, as well as establishing standards for design, construction, and maintenance of improvements on private property where these may affect storm and surface water management. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 1409 § 1 (part), 1988).

13.18.020 Administrator of utility.

The Director of Public Works shall be ex officio administrator of the utility. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 1409 § 1 (part), 1988).

13.18.030 Ownership of city stormwater facilities and assets.

Title and all other incidents of ownership of the following assets are vested in the utility: All properties, interests, and physical and intangible rights of every nature owned or held by the city, however acquired, insofar as they relate to or concern storm or surface water sewage, further including, without limitation, all properties, interests, and rights acquired by adverse possession or by prescription, directly or through another, in and to the drainage or storage, or both, of storm or surface waters, or both, through, under, or over lands, watercourses, sloughs, streams, ponds, lakes, and swamps, all beginning in each instance, at a point where storm or surface waters first enter the storm and surface water system of the city and ending in each instance at a point where the storm or surface waters exit from the storm and surface water system of the city, and in width to the full extent of inundation caused by storm or flood conditions, together with all funds on deposit in the city storm drainage construction fund and future revenues of said fund. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 1409 § 1 (part), 1988)

13.18.040 Rates and charges – Definitions.

As used in this chapter, the following terms have the meanings set forth below:

(A) “Developed parcel” means a parcel of real property which has been altered by grading or filling of the ground surface, or by construction of any improvement or other impervious surface area which affects the hydraulic properties of the parcel.

(B) “Impervious surface” means those hard surfaced areas which either prevent or retard the entry of water into the soil in the manner that such water entered the soil under natural conditions preexisting any development on the property, and/or those hard surfaced areas which cause water to run off the surface in greater quantities or at an increased rate of flow from that present under natural conditions preexisting any development on the property, including, but not limited to, such surfaces as rooftops, ‘green roofs’, asphalt or concrete sidewalks, paving, driveways, parking lots, walkways, patio areas, storage areas, and gravel, oiled macadam, pervious asphalt or concrete, or other surfaces which similarly affect the natural infiltration or runoff patterns existing prior to development.

(C) “Impervious unit” means a configuration or conglomeration of impervious surface estimated to contribute an amount of runoff to the city’s stormwater management system which is approximately equal to that created by the average single-family residential parcel. One impervious unit (IU) is equivalent to two thousand square feet of impervious surface area. For purposes of computation of rates and charges, impervious units are truncated to the nearest tenth.

(D) “Parcel” means the smallest separately segregated unit or plot of land having an identified owner, boundaries and surface area which constitutes a separate lot or tract capable of being conveyed without further subdivision.

(E) “Single-family parcel” means a parcel which has been actually developed with a single-family residence.

(F) “Undeveloped parcel” means any parcel of real property which has not been altered by grading or filling of the ground surface, or by construction of any improvement or other impervious surface area which affects the hydraulic properties of the parcel.

(G) Repealed by Ord. 2864.

(H) “Other developed parcel” means any developed parcel not defined as a single-family parcel in subsection (E) of this section, including duplexes and rights-of- way. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 1823 § 1, 1995; Ord. 1433 § 1, 1988: Ord. 1409 § 1 (part), 1988).

13.18.050 System of charges.

The following monthly service charges are established for all parcels of real property within the boundaries of the city, as they now exist or as they may be hereafter amended, for the purpose of carrying on the responsibilities of the stormwater management utility:

(A) Undeveloped Parcels. Undeveloped parcels shall not be charged.

(B) Single-Family Parcels. The monthly service charge for each single-family parcel shall be $16.56 per month, which shall hereafter be referred to as the “base rate.”

(C) Other Developed Parcels. The monthly service charge for all other developed parcels, including city-owned properties and rights-of-way, shall be computed by multiplying the base rate times the number of impervious units applicable to the parcel times the rate adjustment for the parcel as determined under Section 13.18.060. This formula is expressed mathematically as follows:

Charge

=

Base Rate X IUs X Rate Adjustment

(D) Minimum Charge. Notwithstanding the number of impervious units applicable to any individual property, there shall be a minimum monthly service charge for all developed properties equal to the base rate. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 2320 § 1, 2006; Ord. 2237 § 1, 2004; Ord. 2040 § 1, 1999; Ord. 1727 § 1, 1993; Ord. 1433 § 2 (part), 1988).

13.18.060 Rate adjustment.

(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 non-pollution generating surfaces.

Infiltration of non-pollution 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 stormwater 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).

13.18.070 Authority to promulgate rules.

The administrator of the utility is authorized to promulgate rules and regulations governing the proration or other adaptation of rates to particular site circumstances and any other matters necessary to calculate or impose the service charges provided for in this chapter. (Ord. 2864 § 2 (part), 2016: Ord. 2464 § 3 (part), 2009: Ord. 1433 § 2 (part), 1988).

13.18.080 Billing and collection.

Repealed by Ord. 2464. (Ord. 1682 § 8, 1992: Ord. 1433 § 2 (part), 1988).