Leith Flood Protection Scheme

Otago Regional Council

Dunedin, New Zealand

Widening the Leith Channel is a flagship project for Otago Regional Council as it will ensure protection against once in 200-year flood events and reduce the impact on nearby infrastructure and properties.

Calibre Consulting provided the structural and civil design works, involving a four metre extension to the historic pedestrian bridge and a new water main pipe bridge spanning 16 metres across the waterway.

To enable the river widening excavation works to take place, Calibre Consulting worked closely with the client to organise the multitude of in-ground services. This included a 600mm sewer, 450mm water main, stormwater systems, high voltage cables, data and telecommunications cables to be redirected and moved without any interruption to the essential and complex university data and power networks.

As the water main was one of the Dunedin City Council’s key water distribution pipes our team had to work within a limited shutdown timeframe to change over to the new pipe. We developed a construction methodology to minimise the amount of work required on site, ensuring the pipe could be commissioned for service immediately after the construction was complete.

Leith Flood Protection Scheme


Chris Wrathall

Regional Leader – Southern | Sector Leader – Water

+64 3 371 0556
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