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Ōtaki to North of Levin Highway Hydrogeological Assessment

Contributing hydrogeological know-how to help futureproof a length of highway suffering from flooding and exacerbated by climate change

  • $1B+

    Construction Cost

  • 24KM

    Highway Length

  • 35

    Exploration Bores

  • Ōtaki, New Zealand

    Ōtaki, New Zealand

Improving a key corridor’s resilience

For over a decade, our team has been supporting Waka Kotahi on the Ōtaki to north of Levin (Ō2NL) transport corridor—a programme of works to improve safety, resilience, and planning to increase transport options for the area’s growing population.

A portion of the services we provided has focused on the hydrogeological elements of the new offline highway. Part of our responsibility was to provide a technical assessment to support the Notice of Requirement and resource consent application. We undertook a comprehensive site investigation including literature and data reviews, borehole installation, field testing and monitoring, and geological and hydrogeological modelling. We also interpreted data to support the assessment of environmental effects (AEE) to determine ecological and water user impacts. The analyses also informed other types of AEEs for the project, including terrestrial and aquatic ecology (wetlands).

The knowledge gained by our assessments was used to help the client, iwi, stakeholders, and community groups understand the hydrogeological aspects of the project and give them the confidence to make informed decisions. By collaborating across our multidisciplinary teams, the hydrogeological work has contributed to ensure that the new highway is much more resilient, thereby ensuring access to communities is retained for the future.

At a Glance

  • Waka Kotahi NZ Transport Agency
  • Jack McConchie (SLR Consulting)
Meet Our Team

Hisham Zarour, Senior Principal Hydrogeologist, Team Leader Geosciences

Out of sight is not out of mind, the groundwater guy says!
Hisham Zarour Senior Principal Hydrogeologist, Team Leader Geosciences Read More

Vanessa Dally, Principal, Hydrogeology

My interest is in how we deal with our groundwater resources, keeping them pristine is so important for now and for the future.

Hisham Zarour

Senior Principal Hydrogeologist, Team Leader Geosciences

Vanessa Dally

Principal, Hydrogeology

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