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Local Area Plan (closes 20 December 2024) Napier and Hastings Future Development Strategy (closes 23 December 2024)

Havelock North dams and streams – post-Cyclone Gabrielle

This page provides information on the streams and dams of Havelock North with particular focus on the Mangarau Stream and dam, their performance during Cyclone Gabrielle, and what work Council is doing for future resilience.

You can find newsletters that have been sent to residents, historic and current reports, related information, and Council contact details if you have questions.

Residents’ updates

Enter your email to receive updates

Follow this link if the form fails to load. online form.

Streams

There are five naturally occurring streams, Herehere, Mangarau, Te Kahika, School and Karituwhenua, which take water from the surrounding hills, and flow through the correspondingly named dams.

SEE A MAP OF THE STREAMS HERE

Responsibility for the management of the streams sat with Hawke’s Bay Regional Council until the early 2000s. A governance agreement moved responsibility to Hastings District Council in 2003.

Cyclone Gabrielle

Cyclone Gabrielle was estimated to be a 1 In 250-year event.

The Cyclone Gabrielle flood flow calculation for the Havelock North flood detention dams’ report by Stantec outlines how the five dams performed during Cyclone Gabrielle The report found that:

  • Despite the level of rainfall, a post-cyclone report on the dams’ performance found they worked as designed. None of the dams reached full capacity, however the Mangarau Dam did begin to release water via its spillway.
  • The Mangarau Dam performed satisfactorily (as designed) and did not breach the dam walls Itt released flood waters, via the spillway designed to control flow, into the Mangarau Stream
  • The main contributor to the heightened water flows from the Mangarau Dam was the sheer amount of rain that fell over the 24 hours, with water in the 12.5m deep dam reaching 11.2m. Earlier data from the dam gauge (2007 to 2022) shows the Mangarau Dam did not, over that time period, exceed a water-depth of 5.5m.

The Government has been working on new regulations (PIC) for dams since 2019. They will come into force in 2024. The regulations are designed to ensure dams are well operated, maintained, property and the environment is cared for. More information is available here.

What Council is working on

Council is working on two key programmes for the Havelock North streams and dams following Cyclone Gabrielle:

  1. A Mangarau Stream Project Plan to enable the recatgeorisation of affected properties from 2c to 1 by Hawke’s Bay Regional Council

    View information on the 2c recategorisation programme here.

  2. A Havelock North streams management strategy to improve maintenance and increase the level of flood protection

Strategy development

The Havelock North Streams Management Strategy will set the direction for the future management of the streams.

Workstreams cover maintenance (including access to enable maintenance work to be carried out), bank stabilisation, modelling, review of telemetry and monitoring, dam safety improvements (including Emergency Action Plan), and landowner/Council understanding of responsibilities.

Read the draft of the strategy.

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