Brightwater Marine Outfall

$1.7 billion wastewater system for Seattle

Opus was the principal design consultant and provided construction services for the installation of the 1650m long outfall to a depth of 200m.

The outfall includes 120m of 2100mm diameter steel pipe and 1530m of twin 1600mm diameter polyethylene (HDPE) pipe.

We came up with unique solutions to meet a number of challenges:

  • Steep off-shore slopes and deep installation
  • Stresses in the large pipes
  • Seismic loading and soil liquefaction conditions
  • Corrosion control systems
  • Remote operating vehicle (ROV) operation of the 62 ports and gates.

This outfall project received multiple awards including:

  • American Council of Engineering Companies – Gold Award: Water & Wastewater Engineering
  • ASCE Seattle Section – Structural Engineering Honor
  • ACEC Washington – 2010 Engineering Excellence Gold Award for Water & Wastewater Projects
  • ACEC – 2010 National Engineering Excellence Award Finalist
  • CEBC – Engineering Excellence
  • CMAA – CM Project Achievement Award: Infrastructure Under $50 Million
  • ENR Magazine – Best of the Best Projects 2009: Civil/Public Works
  • IRWA Puget Sound Chapter – 2009 Project of the Year Runner-Up
  • Northwest Construction Magazine – Best Heavy Civil Project of 2009
  • NWCCC – 2009 Distinguished Project (Honorable Mention) 
  • Washington State Chapter APWA– Environmental Project of the Year: $25 million -$75 million