Outfall Construction

The successful delivery of outfall projects requires a high level of engineering expertise, an open mind to potential methodologies and access to specialist equipment and personnel.  We pride ourselves as having core capabilities in these three requirements, and welcome enquiries for involvement in the early stages of outfall project procurement.

Through Smithbridge Australia, Brady Marine & Civil have successfully delivered two outfall projects, each with unique methodologies and project challenges.

The first was a cooling water outfall pipeline for the Kwinana Gas-fired power station south of Perth.  This was constructed using a "dig & lay" methodology working from a 324m long temporary bridge.

Challenges to be overcome included silt containment while working immediately adjacent to the Perth desalination plant intake, extensive stakeholder involvement, geotechnical considerations as well as tight program and budget constraints.

This project was an outstanding success, evidenced by it receiving a state and subsequent National Earth Award (category 3) in 2008.

The second project was a 620m long sewerage outfall pipeline at Christies Beach south of Adelaide for client SA Water.  The project was constructed in Joint Venture with BMD Constructions.

The chosen methodology at Christies Beach was to "bottom pull" a concrete weight-coated steel pipeline, using an onshore winch pulling via an offshore anchor.

Challenges included constructing and excavating a trench through the surf zone, offshore dredging of a shallow trench plus site constraints including limited space onshore within an operational treatment plant.

As for Kwinana, the chosen methodology contributed to it's ultimate success, evidenced by the project being awarded an Earth Award in 2010.