Heather Downs Detention Pond Retrofit

Contact Information
Ken Srilofung, P.E.
Surface Water Engineer
Renton, WA 98057

This project includes the design and construction needed to convert the existing Heather Downs Detention Pond located at Union Avenue SE and SE 4th Street into a combined detention and wet pond facility. The completion of this project will reduce peak flow to the outfall system and erosion and gully downstream of the pond. Other benefits will include help protecting and restoring water quality in Lake Washington by reducing stormwater impacts from existing infrastructure and development.  
The city was awarded grants from the Washington State Department of Ecology Stormwater Financial Assistance program and the King County Waterworks program for this project. Project planning and design will be completed in 2020 with construction planned for summer 2021.

Contract Award Information

The Surface Water Utility solicited qualifications from consultants in accordance with City policy 250-02. Six responses were received and evaluated.  Louis Berger U.S., Inc. ranked the highest and was selected to perform this work.

Council awarded the contract to Louis Berger U.S., Inc. in the amount of $111,600, for engineering design services, at its regular meeting on January 7, 2019.

The design phase (February 2019 – December 2020) is partially funded by a grant from the Washington State Department of Ecology 2017 Water Quality Combined Financial Assistance program.  The construction phase (summer 2021) is partially funded by a grant from the King County Waterworks program.

Project Description

Stormwater runoff from approximately 30 acres of predominately impervious area including driveways, streets, buildings, and other impervious areas collects in catch basins and pipes and flows to the Heather Downs Detention Pond, where it currently provides no treatment runoff. The pond runoff discharges to Maplewood Creek, a tributary to the Cedar River, and ultimately to Lake Washington.   

The project will retrofit a city-owned detention facility in the Heather Downs residential development to be a combined detention and water quality treatment facility. This stormwater facility will provide flow control and additional basic water quality treatment to remove pollutants from streets and other pollution generating surfaces within a 30-acre drainage basin.

Project Update

The engineering design phase of this project includes:

  • Review of existing data.
  • Survey and base mapping.
  • Water quality pond sizing analysis and conceptual design.
  • Geotechnical investigation and analysis.
  • Environmental permitting assistance.
  • Development of design report, construction plans and specifications.

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