Stormwater Utility

Redmond Stormwater Technical Notebook Update (2022)

Redmond Stormwater Technical Notebook Update (2022)

The 2022 Redmond Stormwater Technical Notebook (STN) is now available on the City’s website. The 2022 Redmond Stormwater Technical Notebook applies to all complete development applications submitted to the City:

  • On or after July 1, 2022.
  • Prior to January 1, 2017 that have not started construction by July 1, 2022.
  • Prior to July 1, 2022 that have not started construction by July 1, 2027.  

The STN lays out stormwater management requirements for new construction and redevelopment and the edits ensure compliance with the 2019 Stormwater Management Manual for Western Washington. 

Stormwater Technical Notebook  2022

  1. Stormwater Technical Notebook/Issue9-2022(PDF)

StormwaterThe City of Redmond, through its NPDES Municipal Permit, is responsible for ensuring proper maintenance and operation of all public and private stormwater systems within the City. These include 363 miles of pipes, 23,500 catch basins and manholes, 940 vaults, 304 bioswales, 68 miles of streams, and 328 ponds throughout the City.

The Stormwater Utility: 

  • Ensures that public and private stormwater systems are planned, developed and maintained to prevent flooding, protect water quality and preserve natural stormwater systems
  • Monitors water quality and provides leadership and focus for community efforts working toward improved stormwater management
  • Identifies needs for capital improvement of the stormwater systems including streams and habitat, prioritizes, selects, and constructs those improvements
  • Ensures that City construction and maintenance projects are planned and implemented to cause as little short term and long term harm as possible to the environment

Managed by the Public Works Department, Environmental and Utility Services division, the Stormwater Utility funds support engineers, scientists, technicians, inspectors, project managers, and administrative specialists in several divisions within the City's Public Works Department. 

The City is addressing Stormwater Management in 3 phases:

Planning

Development

  • Building & maintaining regional facilities
  • Low Impact Development (LID)
  • Stormwater Technical Notebook
  • Standard specifications & details

Maintenance

  • Building and maintaining stormwater ponds
  • Private drainage inspections
  • Spill Response (IDDE)
  • Maintenance and operations of public systems
  1. What is stormwater?
  2. How does stormwater affect pollution?
  3. How does stormwater increase flooding?
  4. What are ways to help prevent stormwater flooding and pollution?
  5. What is a Media Filter?
  6. What is a Stormwater Treatment Wetland?
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