• 0.6-1.1mprojected sea level rise

Damage to Island Bay Seawall

The sea level is predicted to rise by somewhere between 60 centimetres and 1.1 metres. With it, the underground water table may rise.

Potential impacts include:

  • erosion and inundation of low-lying coastal land
  • damage to infrastructure and building foundations
  • increased flood risks, and
  • increased risks of liquefaction in an earthquake.

A warming climate is also likely to make severe storms more frequent, bringing risks of property and infrastructure damage.

Although a 60 centimetre to 1.1 metre sea level rise would mainly affect only a small number of coastal areas, the impact could still be significant. One of the most important tasks facing the Council is to prepare the city for these impacts. We will have to make decisions, for example, about whether coastal land needs to be protected by sea walls, or if changes are needed to the stormwater system and other infrastructure.

The first step is to understand the possible impacts, and the measures that can be taken to reduce or mitigate them.

Over the next three years, we will:

  • develop a hydraulic model to assess the impact of increased storm intensity and rising sea levels on the stormwater network, so we can make informed decisions about land use, building and infrastructure
  • review District Plan provisions for areas that might be vulnerable to rising sea levels
  • review the Council’s Climate Change Action Plan.

Key projects in our plan