Christchurch is vulnerable to a range of natural hazards, with the potential for significant harm to people and property. Both the Canterbury Regional Council and the Council have responsibilities for the avoidance or mitigation of natural hazards.
- In 2013 there was around 74,000 people living in areas at risk of flooding, and around 39,000 people living in areas where there is a risk of coastal inundation. This accounts for approximately 21% and 11% of the city's population respectively.
- In 2013 number of households living in areas susceptible to coastal inundation declined from close to 20,000 households around 15,000 households; 32% of these households are living in rental properties.
- Similarly, the number of households living in areas at risk of flooding decreased from 34,000 to around 29,000 in 2013; around 34% of these households live in rental properties.
- The proportion of children living in areas at risk of flooding has remained relatively stable since 2001, sitting at around 18% of the population in 2013. The proportion of children living in areas that are at risk of coastal inundation has declined slightly since 2001, but also accounts for 18% of the population.
- 13% of residents living in areas susceptible to coastal inundation are over the age of 65; this has remained the same since 2001. However the proportion of residents over 65 years in flood zones has seen a small increase, reaching 14% in 2013 compared to 13% in 2001 and 2006.
- Although there was a decline between 2006 and 2013, most people living in flood risk areas have lived there for less than five years (48%). Only 4% of residents in flood risk areas have lived there for 30 years or more.
- 45% of residents living in areas at risk of coastal inundation have lived there for less than 5 years, whilst only 4% have lived there for 30 years or more.
Usually Resident Population Flood Zones
Usually Resident Population Coastal Inundation Zones
Number of Households in Flood Zones
Number of Households in Coastal Inundation Zones
Proportion of Children and Older People in Flood Zones
Proportion of Children and Older People in Coastal Inundation Zones
Years at Usual Residence in Flood Zones
Years at Usual Residence in Coastal Inundation Zones
More detail and information
Coastal Hazards: Around New Zealand, and the world, coastal communities are becoming increasingly aware of coastal hazards, such as coastal inundation (flooding by the sea), coastal erosion and tsunami. It's important we look ahead to ensure we are prepared to deal with the challenges of coastal hazards in the future, creating more resilient communities.
Slope Stability: The Council has released eight GNS Science reports detailing the level of risk from mass movement in eight areas in the Port Hills.
Managing Natural Hazard Risk in New Zealand – towards more resilient communities: (external link) This report reviews current arrangements for managing natural hazards risk in New Zealand.