Kaipara Hill Country Erosion Project

What is the Kaipara Hill Country Erosion Project?

Sedimentation of the Kaipara Harbour is a long-standing issue with the state of the harbour’s physical and ecological values declining, partly because of increased sediment loads entering the harbour from its surrounding catchment. The Kaipara Hill Country Erosion Project is a four-year, $3.5 million land-based initiative (comprising central government, Northland Regional Council and land owners’ contributions) aimed directly at reducing sedimentation of the Kaipara Harbour.

Hill slope erosion is a major problem within the Kaipara catchment, with 23% of the catchment’s land area identified and mapped as high erosion risk hill country (based on land use capability, slope and vegetation - see the map below). These high-risk erosion areas occupy more than 102,000ha of the catchment and are modelled to account for approximately 72% of annual sediment loads entering the harbour. Allocating resources into these areas can make a noticeable impact on reducing this hillslope erosion and sedimentation.

If your property is in a high erosion risk area and you’d like some advice on soil erosion issues, our land management advisors are keen to work with you. We can help you with tailored plans and conservation techniques to enhance the productive capability of your land and at the same time reduce soil erosion and the rate of sedimentation in the Kaipara Harbour. Contact us at the regional council on 0800 002 004.

Map displaying areas of high erosion risk in hill country environments within the Kaipara catchment.Areas of high erosion risk in hill country environments within the Kaipara catchment.

Soil Conservation: past, present and future

Soil erosion control schemes were first introduced to Northland in the 1960s, with more than 300 farms actively managing soil erosion since then. Revisiting these historic schemes and assessing both the successes and failures of applied conservation methods has played a huge role in progressing the Kaipara Hill Country Erosion Project, with current conservation recommendations influenced by what we have learnt.

Soil conservation is constantly evolving, changing with our altering landscape and environment. As part of the Kaipara Hill Country Erosion Project, the regional council is funding soil conservation trials and research to further progress soil conservation within the Kaipara catchment and across Northland. A short video highlighting the history, present day issues and future potential of conservation poplar within Northland follows.

Poplar trees for soil conservation | Northland's story

Watch the video about using poplar trees for soil conservation in Northland

Free soil conservation poplar and willows

Poplar and willow play a huge role in the fight against hill country erosion and the regional council actively promotes the use of both trees. We can provide free poplar and willow poles to land owners who need them for soil conservation purposes within the Kaipara catchment. Numbers are limited, so please contact one of the regional council's land management advisors on 0800 002 004 regarding supply.

Find out more about poplars and willows for erosion control

Poplar poles planted for erosion control.