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Kaiaua township experiences regular flooding from the Hauarahi Stream during major rainfall.

We’ve been working with Waikato Regional Council and the community on some options to help reduce the impact of flooding by improving the flow of the Hauarahi stream. The work will help manage the effects of storm water, but it won’t prevent flooding altogether, or address coastal hazards.

We’ve allocated $100,000 for the Hauarahi stream work, including:

  • Rock protection of high erosion areas and earthworks
  • Stream clearing and blockage removal

The work would be done over a two‐year period, with the cost recovered via a targeted rate over five years.

Stage One complete

Covid-19 pushed pause on the Hauarahi Stream project during Level 3 and 4, but once work started again, we made good progress clearing blockages upstream of East Coast Road Bridge. We’ve also put in high flow benches (areas along the river, usually on bends, where a flat bench is dug into the bank, making the river wider. When the river flows over the bench, it can spread out but stay contained within the riverbanks). Flow benches are about 20 to 30 metres long. Rock riprap (large boulders put in place to protect shorelines against scour and water erosion) are also being added. Ripraps are built in 50-metre sections.

By working closely with the adjoining land owner and Waikato Regional Council (WRC), Stage One works are now complete. We were advised that the works would need to be spread over two construction seasons, so construction of the next 50 metre section of riprap will start in May 2021. This gives the river and river life chance to recuperate after this year’s works.

Kaiaua Coast 2120 - Looking Ahead

The Hauarahi Stream work is in addition to other work the council is doing to find a long term solution to managing coastal hazard risks in the area, including sea level rise. 

The council has appointed environmental management experts, Traverse Environmental Ltd, to work alongside the relevant councils and with the affected communities, iwi and other stakeholders, to develop a strategy for how we will respond to coastal hazard risks in the future.

The community is participating in a separate community planning process that will look at a wide range of issues around the coast and how we can provide for a resilient and prosperous future over the next 100 years.

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Timeline

Mar 2019 - Community consultation

Sep 2019 - $100,00 allocated to the project

Early 2020 - Work begins

2022 - Expected completion

View the maps

Map of proposed works (jpg, 351KB)

Map of area of benefit (jpg, 88KB)

Kaiaua Coast 2120 - Looking Ahead

The community is participating in a separate community planning process that will look at a wide range of issues around the coast.