Land Hazards

This page contains information about coastal and urban land hazards to assist those who are planning property development in the district.

Land hazards are risks from natural hazards including land instability, flooding, coastal hazards and fire.

Land hazard maps 

Our Geographical Information System (GIS) mapping system displays comprehensive land hazard maps for the Kaipara district.

Maps contained in the research reports on land instability and coastal hazards listed in the table at the bottom of this page are separate from the GIS.

Using the GIS maps

In the GIS, select the module named 'Hazards' and search for the address or select an area from the locations box. A map of that area or street will display which includes any hazards which may have been identified for that area. The maps can be magnified to see closer details.

Click on the 'Layers' tab as well to filter the hazard types and make your search more specific.

Land instability

Geological characteristics and soil types in the district mean that some areas are unsuitable for development. Inappropriate earthwork activities and / or the removal of vegetative cover also contribute to land instability.

Coastal instability

Coastal hazards pose a significant threat to a high number of communities in the district.

Coastal hazards

Erosion, landslips and sea water flooding are the dominant natural coastal hazards along the district's coastline.

Coastal erosion is either a long-term trend or a significant short-term shoreline fluctuation, especially on sand dune-backed coasts. Landslip is directly associated with coastal erosion where the geology is relatively weak and prone to slope failure. (Mapping still to be completed)

Severe coastal storms or tsunami produce waves which can temporarily flood low-lying coastal areas. The effects of climate change are likely to increase hazards in the coastal zone.

Flooding

Tropical storms and high rainfall intensities expose many areas to flooding. There are obvious floodway areas plus areas that are susceptible to ponding.

A Flood Susceptibility Report was undertaken and included in the District Plan whilst the Regional Council has undertaken the Priority Rivers Project which shows flooding areas

Our GIS maps are used where specific property information is requested and in assessing building consents.

Contaminants in soil

The National Environmental Standard for Assessing and Managing Contaminants in Soil to Protect Human Health (the NES) ensures that land proposed for development is assessed for soil contamination.