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Southern Corridor Improvement

This project involved the improvements to the section of Auckland motorway between the State Highway 20/State Highway 1 (SH1/20) Interchange and the Papakura Interchange


The Southern Corridor Improvements Project extends for 9.5km over this section of State Highway 1 (SH1).  Ridley Dunphy Environmental Limited (RDE) provided expert advice in drafting the Construction Water Management Report associated with this road widening project.  Not a typical earthworks project, RDE sought innovative ways in addressing erosion and sediment control which involved the use of check dams in permanent swales, utilisation of permanent stormwater features and a cut and cover methodology.  Non-structural measures were also promoted.  The Construction Water Management Report assisted in the successful granting of resource consents and associated conditions.