Justification of a novel pipe-in-tunnel approach to a river crossing

As part of a major pipeline construction project, Laing O'Rourke was required to install a section of pipeline beneath a river estuary. Due to a number of reasons it was not possible to negotiate the crossing using conventional techniques such as horizontal directional drilling (HDD) and an alternate method had to be sought.
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Frankston Drainage Improvement Project

As a low lying area, Frankston on Melbourne's Peninsula is subject to serious flooding during severe wet weather. Tunnelling works are currently underway as part of the $A41 million Frankston Drainage Improvement Project, which is one of Melbourne Water's biggest projects and will provide increased protection from flooding and improve drainage in the area.
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