NZ Flood Models 2021 data update: Now providing 100% coverage and greater detail

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.

Complementing NZ FloodMap is NZ FloodScore, which allocates an easy-to-understand relative flood risk score for addresses and locations across New Zealand. This allows for a fast implementation of a flood risk assessment.

Our recent data update means that NZ FloodMap and NZ FloodScore now also provide: 

  • 100% coverage - over 100k additional properties now included
  • 70% of properties at 5m Urban resolution (up from 54%, or from 5% to 12% by area)
  • Flood defence data for over 35k properties (and will continue to grow in future updates)

Coverage updates

Now with 100% coverage, NZ FloodMap really is a one-stop-shop; no need to translate different data sets into one consistent view to understand risk across the whole of NZ.

Edgecumbe flood mapping
Edgecumbe 2020 data (left) vs 2021 data (right)

         Grey dots highlight address points where no data is available.      Coloured address points show risk scores for Edgecumbe properties

 

Wanganui 2020 data
Wanganui 2020 data - showing a blank area of no coverage
Wanganui 2021 data
Wanganui 2021 data - areas at risk of flood are highlighted

More granular view

Recent data updates also mean much greater coverage at 5m urban resolution – now 70% of properties are available in a more detailed view (up from 54% of properties, or from 5% to 12% by land area).  This more granular, detailed data is especially useful in urban areas where property sizes are smaller, and a few metres can make a material difference to risk.

Thames – 2020 data – 8m
Thames – 2020 data – 8m
Thames – 2021: more detailed 5m urban resolution
Thames – 2021: more detailed 5m urban resolution

 


Flood defense data

Flood defenses have also been incorporated in the FloodScores of over 35,000 properties.  Incorporating more real-world elements means a more holistic view of risk.

Hutt Valley – before incorporation of Flood Defense Data
Hutt Valley – before incorporation of Flood Defense Data
Hutt Valley – FloodScores after incorporating impact of flood defenses in the area
Hutt Valley – FloodScores after incorporating impact of flood defenses in the area

 

New Brighton – 2020 data; with no flood defenses considered in FloodScore
New Brighton – 2020 data; with no flood defenses considered in FloodScore
New Brighton – 2021 data; FloodScore takes into account impact of flood defenses
New Brighton – 2021 data; FloodScore takes into account impact of flood defenses