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Our Reviews of the Wairoa Flood Event - June 2024

Following the June 2024 flooding in Wairoa, we commissioned three independent investigations. On this page are the three reviews and information about the reviewers.

The Hawke's Bay Regional Council (HBRC) has released findings from three independent reviews into the June 2024 flooding in Wairoa. These reviews, commissioned by the Council, aim to understand the event's impacts and identify crucial measures to develop Wairoa’s flood resilience.  

These expert reviews supplement the findings of a Government-commissioned review – lead by Mike Bush – into the wider framework for HBRC’s management of the Wairoa River mouth.

We commissioned three independent reviewers:

  • Graeme Campbell, Strategic Advisor Flood Resilience, Te Uru Kahika – Regional and Unitary Councils Aotearoa, undertook a brief review of the procedures we used and the actions we took about the opening of the Wairoa River Mouth over the period 21 -30 June 2024.
    Download this review here

  • Tonkin + Taylor, an environmental and engineering consultancy, undertook a technical analysis of the flooding event.
    Download this report here

  • Kyle Christensen, an Independent Consultant with over 20 years’ experience in river and stormwater engineering, undertook a review of the management of the Wairoa River mouth in the lead up to the weather event of 26 June 2024 and the decisions made by us about whether the bar should be mechanically opened and, if so, when.
    Download this report here

Hawke's Bay Regional Council Chair Hinewai Ormsby said, "We’ve witnessed the incredible strength, resilience, and unity of the Wairoa community during and after this unprecedented event and following what occurred during Cyclone Gabrielle. We are deeply committed to standing by you every step of the way as we work together to make Wairoa safer and stronger.”

Chair Ormsby said, “these reports, together with the recommendations of the Hawke’s Bay Independent Flood Review mean the Council has clear recommendations for action. These reports confirm that there is no simple solution. There are interim steps that we need to act on immediately to change now we manage the Wairoa river mouth, while the more comprehensive measures will take more time to put in place.”

Hawke’s Bay Regional Council Chief Executive, Dr. Nic Peet said one of the key purposes of these reviews was to understand what occurred during this event so that the risk can be managed into the future.

“The reviews are clear that the flooding in June was the result of high rainfall, rising river levels, spring tides, storm surge as well as the position of the bar. These factors coincided to create 1-in-250-year event. We heard from residents that this type of flooding had not been experienced in living memory, and this is why.

“Even if the bar could have been opened, the flooding may not of have been prevented. However, all reports also indicate that there are things that HBRC can improve with regard to its management of the Wairoa River mouth.”

You can read the full media advisory here

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