Design maximises gravity

Five years of post monitoring has confirmed the success of this outfall at integrating effluent into the predominant offshore seawater current.

Following two years of current and density stratification studies the project team identified the Five Finger Island site as the location to integrate effluent into the Strait of Georgia from the Greater Nanaimo area on Vancouver Island.

The pipeline is a 900mm welded steel pipe with coal tar enamel coating and lining. The coating is protected with wood lagging. The outfall extends 200m from shore to terminate in 70m of water. Twin diffuser arms, each with 53-75mm ports, integrate primary effluent into the seawater mass.

Five years of post monitoring has confirmed the success of the outfall at integrating effluent into the predominant offshore seawater current.