A regional view
We have assessed that for a 1% AEP (annual exceedance probability event*) that;
- Approximately 77,000 commercial and residential buildings are vulnerable to flood impacts. This includes 4,000 commercial buildings and 73,000 residential buildings which represents approximately 31% of all commercial and residential buildings in the region
- Approximately 197,000 people are exposed to flooding, this is also around 31% of our current population
- By 2110 across the Greater Wellington Region, a 1% AEP undefended event will impact 17% more people, that is 230,000 people.
*What is a 1% AEP event? Why use this event? A 1% AEP event is a flood event that has a 1% or one in 100 chance of occurring in any given year. This is sometimes referred to as a 1-in-100-year flood. We use this event for our flood hazard mapping as it is industry standard best practice.
Regional flood model
Regional Flood Exposure Model Viewer
More information if you are in a flood zone
If you live, work or play in a flood zone and are looking for more information on what this means for you and what actions you can take, visit:
Get in touch
- Phone:
- 0800 496 734
- Email:
- info@gw.govt.nz