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Help us finalise flood hazard maps for Upper Hutt
Flooding impacts more people, more often than any other natural hazard in the Wellington region. Understanding flood risk in our communities is more important than ever with the increase in large-scale weather events.
Greater Wellington and Wellington Water have both modelled the impacts of flooding in Upper Hutt. Greater Wellington has modelled the impacts of heavy rainfall on Te Awa Kairangi/Hutt River, while Wellington Water has modelled the impacts on the stormwater network and runoff on behalf of Upper Hutt City Council. Together, these maps will inform district planning, infrastructure investment, and emergency management planning.
By working with communities to understand flood risks, we can help minimise the impacts on people, businesses, and critical infrastructure.
Why this matters.
Flooding is the most frequent natural hazard in our region. Understanding where flooding could happen helps councils, communities, and landowners to:
Plan emergency responses
Protect people, property, and infrastructure
Make informed land use and development decisions
Greater Wellington and Wellington Water are engaging with the community together to keep things simple. We are hosting combined drop-in sessions so you only need to come to one event to discuss flooding affecting your property or neighborhood.
The maps.
Te Awa Kairangi / Hutt River flood modelling Greater Wellington has updated three draft flood maps showing the impacts of:
1900 cumec flood event – the 1% AEP (sometimes referred to as a 1‑in‑100‑year event) in the current climate
2300 cumec flood event – the 1% AEP including climate change
2800 cumec flood event – as agreed with the community in the Floodplain Management Plan
AEP is the Annual Exceedence Probability, or a chance of a flood event of that size occurring in any given year.
These maps show the modelled water depth of major flood events on Te Awa Kairangi / Hutt River. There are some properties that are within the updated flood hazard maps that weren’t in the previous maps. We are working closely with those property owners to ensure they are aware of the flood risk and planned flood protection measures, as well as how they and their community can be prepared.
Stormwater flood modelling Wellington Water has generated two stormwater flood maps on behalf of Upper Hutt City Council:
10% AEP flood map – (sometimes referred to as a 1‑in‑10‑year flood)
1% AEP flood map – (sometimes referred to as a 1‑in‑100‑year flood)
To ensure accuracy, Wellington Water would like to confirm whether these maps match your lived experience of flooding in your neighborhood, your property, street, or wider area.
These maps are your opportunity to share any differences or questions that you may have following your lived experience in this area. You can do this by sharing flooding photos, stories, or observations. Community feedback is openfromMonday 3 November toFriday 12 December 2025.
How to have your say
Explore the maps by clicking between them on the map tool.
Use the tool to leave comments and give feedback.
You can also upload photos and videos to add more detail.
Your feedback will help us ensure these maps accurately reflect local conditions before they’re finalised.
Need more information or to talk to someone?
If you’d prefer to talk with a Greater Wellington staff member to share your experiences, please email us at floods@gw.govt.nz.
Or join us at one of our drop-in sessions to view the maps and share your recollections:
Brewtown Farmers’ Market
Sunday, 16 November
9am – 12pm
Upper Hutt Library
Saturday, 22 November
10am – 12pm
Brewtown Farmers’ Market
Sunday, 30 November
9am – 12 pm
Upper Hutt Library
Wednesday 3 December
4pm – 6pm
For advice on how to prepare for floods, or information about our wider flood protection work, please visit www.gw.govt.nz/flood-protection.
How we’ll use your information
Please be aware that any feedback you share on the maps below will be visible to all visitors to the page. However, your personal details will be kept private.
We use this information to refine our flood hazard model maps for Upper Hutt. We may also use your information to contact you to discuss your information in further detail or clarify things further with you. Your information is held securely by Greater Wellington, find out more in the Privacy Statement to the right.
Help us finalise flood hazard maps for Upper Hutt
Flooding impacts more people, more often than any other natural hazard in the Wellington region. Understanding flood risk in our communities is more important than ever with the increase in large-scale weather events.
Greater Wellington and Wellington Water have both modelled the impacts of flooding in Upper Hutt. Greater Wellington has modelled the impacts of heavy rainfall on Te Awa Kairangi/Hutt River, while Wellington Water has modelled the impacts on the stormwater network and runoff on behalf of Upper Hutt City Council. Together, these maps will inform district planning, infrastructure investment, and emergency management planning.
By working with communities to understand flood risks, we can help minimise the impacts on people, businesses, and critical infrastructure.
Why this matters.
Flooding is the most frequent natural hazard in our region. Understanding where flooding could happen helps councils, communities, and landowners to:
Plan emergency responses
Protect people, property, and infrastructure
Make informed land use and development decisions
Greater Wellington and Wellington Water are engaging with the community together to keep things simple. We are hosting combined drop-in sessions so you only need to come to one event to discuss flooding affecting your property or neighborhood.
The maps.
Te Awa Kairangi / Hutt River flood modelling Greater Wellington has updated three draft flood maps showing the impacts of:
1900 cumec flood event – the 1% AEP (sometimes referred to as a 1‑in‑100‑year event) in the current climate
2300 cumec flood event – the 1% AEP including climate change
2800 cumec flood event – as agreed with the community in the Floodplain Management Plan
AEP is the Annual Exceedence Probability, or a chance of a flood event of that size occurring in any given year.
These maps show the modelled water depth of major flood events on Te Awa Kairangi / Hutt River. There are some properties that are within the updated flood hazard maps that weren’t in the previous maps. We are working closely with those property owners to ensure they are aware of the flood risk and planned flood protection measures, as well as how they and their community can be prepared.
Stormwater flood modelling Wellington Water has generated two stormwater flood maps on behalf of Upper Hutt City Council:
10% AEP flood map – (sometimes referred to as a 1‑in‑10‑year flood)
1% AEP flood map – (sometimes referred to as a 1‑in‑100‑year flood)
To ensure accuracy, Wellington Water would like to confirm whether these maps match your lived experience of flooding in your neighborhood, your property, street, or wider area.
These maps are your opportunity to share any differences or questions that you may have following your lived experience in this area. You can do this by sharing flooding photos, stories, or observations. Community feedback is openfromMonday 3 November toFriday 12 December 2025.
How to have your say
Explore the maps by clicking between them on the map tool.
Use the tool to leave comments and give feedback.
You can also upload photos and videos to add more detail.
Your feedback will help us ensure these maps accurately reflect local conditions before they’re finalised.
Need more information or to talk to someone?
If you’d prefer to talk with a Greater Wellington staff member to share your experiences, please email us at floods@gw.govt.nz.
Or join us at one of our drop-in sessions to view the maps and share your recollections:
Brewtown Farmers’ Market
Sunday, 16 November
9am – 12pm
Upper Hutt Library
Saturday, 22 November
10am – 12pm
Brewtown Farmers’ Market
Sunday, 30 November
9am – 12 pm
Upper Hutt Library
Wednesday 3 December
4pm – 6pm
For advice on how to prepare for floods, or information about our wider flood protection work, please visit www.gw.govt.nz/flood-protection.
How we’ll use your information
Please be aware that any feedback you share on the maps below will be visible to all visitors to the page. However, your personal details will be kept private.
We use this information to refine our flood hazard model maps for Upper Hutt. We may also use your information to contact you to discuss your information in further detail or clarify things further with you. Your information is held securely by Greater Wellington, find out more in the Privacy Statement to the right.
