Is my property affected?

The Council commissioned engineering and environmental consultancy firm Tonkin and Taylor Ltd to carry out a coastal hazards assessment report for Christchurch and Banks Peninsula.

Affected areas

View the maps showing the areas that the Coastal Hazard Assessment Report identified as potentially affected by coastal erosion or inundation.

Property Search

Use the individual property search to find out if your property falls within the coastal hazard zones.

Assessment zones

The report defines four coastal hazard erosion and inundation zones - two for erosion and two for inundation: 

  • Coastal Erosion Hazard Zone 1 - Areas likely to be susceptible to coastal erosion over a 50 year timeframe
  • Coastal Erosion Hazard Zone 2 - Areas potentially susceptible to coastal erosion over a 100 year timeframe
  • Coastal Inundation Hazard Zone 1 - Areas assessed to be susceptible to coastal inundation in a 1-in-50 year storm event, taking into account predicted sea-level rise in the next 50 years
  • Coastal Inundation Hazard Zone 2 - Areas assessed to be susceptible to coastal inundation in a 1-in-100 year storm event, based on a longer-term prediction on sea-level rise for the next 100 years.

A 1-in-100 year storm event is a significant flood that has a one per cent probability of occurring, or being exceeded, in any one year. A 1-in-50 year storm event has a two per cent probability of occurring, or being exceeded, in any one year. These are major storm events which take predicted sea-level rise into account.

Impacts of coastal hazards

Being able to identify properties within predicted coastal hazard areas allows us to make informed planning decisions for the future. These issues are not unique to Christchurch. Around the world, coastal inundation and erosion is expected to increase as sea levels continue to rise.

Communities and authorities need to work together to proactively plan and look at how we want to respond to the risks from these hazards.

More information about the need for future planning.