“Floods are New Zealand’s number one hazard in terms of frequency, losses and declared civil defence emergencies” – National Emergency Management Agency.

With events like we’ve seen in Canterbury, and just last week in Marlborough and the West Coast, this rings true more than ever.  Floods can impact networks, assets, teams and customers.  By understanding likely impacts in advance of a weather event, you can be best prepared to get services and customers back up and running, as well as mitigate risk to your crews.

NZ FloodMap 

NZ FloodMap offers a consistent spatial view of flood risk throughout New Zealand. Its high resolution and precision map layers contain inundation risk for different event probabilities, enabling detailed analysis of flood risk anywhere in New Zealand, down to property level. NZ FloodMap offers:

  • A consistent spatial view of flood risk throughout New Zealand
  • A granular view down to 5m resolution in urban areas
  • A full range of return periods for all major flooding sources 
  • Global best practice modelling methodology, using local data and science
  • The option to overlay with other data, including your own, or with CoreLogic BaseMaps to visualise real-world impact 
  • The perfect companion to NZ FloodScore, which is built using the same data and allocates a single risk ‘score’ to properties

We’ve recently also completed a data update using more granular and comprehensive inputs.  This means that NZ FloodMap now also provides: 

  • 100% coverage of NZ properties- over 100k additional properties now included
  • 70% of properties at 5m Urban resolution 
  • Flood Defense data for over 35k properties 

 

Comparison of actual footage of the Canterbury floods and NZ FloodMap data

Manse Bridge, Temuka (looking south east) - 31 May 2021
Manse Bridge, Temuka (looking south east) - 31 May 2021. Source: John Bisset/Stuff
CoreLogic NZ FloodMap - Manse Bridge
NZ FloodMap aerial view of Manse Bridge with 1in20yr fluvial layer

 

 Near Lake Ellesmere 1 June 2021
Near Lake Ellesmere 1 June 2021. Source: Jacinda Ardern/Instagram
Aerial view of the same area as above
NZ FloodMap aerial view of the same area as above

 

Ashley River in flood - 31 May 2021
Ashley river 31 May 2021. Source: NZ Herald

 River flows for the Ashley Gorge were over double that expected in a 1 in 100 year flood.  However this was the highest recorded in the available telemetry scores; many locations were well below the threshold.

NZ FloodMap Ashley river
NZ FloodMap aerial image of same area as above