How we reduce natural hazard impacts

climate change, rising sea levels, erosion, landslips, flooding, earthquakes, resilience

What’s it all about

This is about how we handle the variety of natural hazard risks facing Porirua, such as tsunami, landslips, coastal erosion, flooding and earthquakes. 

To do this we need to identify and understand the natural hazards that affect the city and how we can work with and around them. 

It’s about allowing for growth in the city, while managing the risks posed by natural hazards.

Issues

We want to enable growth in the city while managing the risk from natural hazards to keep our community safe. This means having a good understanding of the risks and then guiding development in hazard areas to minimise them, such as requiring higher floor levels on buildings in flood areas.

To do this we propose to:

  • restrict or prevent certain development in high hazard areas
  • enable work that reduces the risk of some hazards 
  • look at allowing for higher densities on properties that are not in hazard zones
  • enable development in low hazard areas where the design reduces the risk
  • require the development of road, and sewage and water systems (infrastructure)  to address any natural hazard risk, and ensure it is designed to continue operating after a natural hazard
  • encourage self-reliance and resilience, such as provision of onsite water supply/rain tanks

We need to consider climate change and how rising sea levels will affect our communities. We have existing properties, roads and pipes, and new development in vulnerable coastal areas. While these are desirable living environments, development in coastal areas is not always appropriate. We need to understand how sea level rise will affect our coastal communities over time and identify a long term response to it.

To do this we propose to:

  • identify the sea level rise predicted to affect Porirua over the next 100 years and work with communities to manage, control, or limit development in areas that could be affected to reduce the risk to existing and future development, and infrastructure. 
  • restrict or prevent development in high hazard areas and allow this space to be retired or used for public good such as open space.
  • identify and manage development and activities within communities that are at risk from flood hazards