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Providing 

Innovative Solutions 

for Our Clients 

since 1965

 

Brightwater Marine Outfall   King County, Washington State, U.S.A.
 

 

Winner of   Award of Excellence 2009

CEBC - Consulting Engineers of British Columbia, Canada;

 

Winner of   Local Civil Engineering Achievement Honor Award 2009

ASCE - American Society of Civil Engineers;

 

Winner of   2009 Project of the Year - Environment Category

APWA - American Public Works Association, Washington State Chapter;  

 

 

Pictures from CEBC:

 

Pictures from ASCE:

 

Pictures from APWA:

 


Project High Lights:

Summary:

  • Part of $1.6 Billion Wastewater Treatment System.


  • Discharge Depth 200m.


  • 120m of 2100mm Diameter Steel Pipe.


  • 1650m Long.


  • 1530m of Twin 1600mm Diameter High Density Polyethylene (HDPE) Pipe.


  • Extreme loading requirements during deployment and during a seismic event.


  • Largest diameter HDPE pipe in North America.


  • Deepest municipal outfall in North America.

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Challenges:

  • Sensitive marine areas with environmental sustainability permitting requirements and tight scheduling.


  • 25% to 30% offshore slopes with soils sensitive to liquefaction and sliding.


  • Critical hydraulic design requirements for head losses, and effluent dispersion.

  • All pipes and connections required to be installed with divers or remote operating vehicles (ROV).


  • Four ballast weight designs were required to control loading.


  • All ports and access hatches are designed for high pressures and opening at 200m depth

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Achievements:

  • A tough, durable outfall has been provided at the required location and depth.

  • The strict environmental sustainability permit conditions and construction site disturbance conditions were met.


  • A program for hydraulic analysis of the outfall and the diffuser was developed.


  • A complex weighting system and a seismic anchor were developed to address the soil liquefaction and sliding concerns.


  • An ROV compatible opening system for the ports and hatches was developed that did not result in undue risk during the high stresses of deployment.

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