what we do

Stormwater

Developing best management practices

Stormwater management practices and regulations have advanced rapidly in recent years. To reduce the impact of built areas, Parametrix uses low impact development (LID) principles and practices. Our solutions optimize the use of on-site natural features to improve water quality, protect habitat and wildlife, reduce life-cycle costs, and enhance communities. We apply the latest technologies to provide clients better ways to manage stormwater.

Parametrix Stormwater - SR 520 Bridge Replacement and HOV Program, Seattle to Redmond, Washington
SR 520 Bridge Replacement and HOV Program
​​Seattle to Redmond, Washington
Client: ​WSDOT

Stormwater management has been a critical component of this 13-mile highway and floating bridge improvement project that crosses Lake Washington and several streams. Parametrix has developed several stormwater quantity and quality best management practices for the program including stormwater wetlands, ecology embankments, bioswales, and stormwater vaults. Funded by a FHWA grant, we researched and developed an innovative treatment system for removing dissolved metals, total suspended solids, oil, and grease from roadway runoff. Runoff was modeled using the new WSDOT Hi-Run model which was adapted for discharges to a lake environment or Puget Sound.

 

VIEW OUR STORMWATER PROJECTS

  • Manchester Stormwater Retrofit | Parametrix

    Manchester Stormwater Retrofit

  • NPDES Stormwater Management Program  | Parametrix

    NPDES Stormwater Management Program

  • Surface Water Comprehensive Plan Update | Parametrix

    Surface Water Comprehensive Plan Update

  • Newberg-Dundee Bypass | Parametrix

    Newberg-Dundee Bypass

  • Duwe’ig Stormwater Treatment Wetlands | Parametrix

    Duwe’ig Stormwater Treatment Wetlands

  • Parametrix Stormwater - SR 520 Bridge Replacement and HOV Program, Seattle to Redmond, Washington

    SR 520 Bridge Replacement and HOV Program

Water

"Over the past year I have had the pleasure of working with the Parametrix team on the City's Storm and Surface Water Utility Comprehensive Plan Update. This has truly been a collaborative effort... working alongside city staff from a variety of departments and programs in addressing policy, regulatory and natural resources challenges."

Brian Ward, PE, Utilities Engineer, City of Bellevue, Washington