Coastal Hazard Overlay

Coastal hazards occur when a natural process has adverse effects on human safety, property or on objects or areas that are valued by humans, or when human activities generate anomalies in natural processes, causing those processes to act in unforeseen ways. Human responses to such hazards may, in turn, have other adverse effects on the environment and on the economic, social, and cultural well-being and health and safety of people.

The Coastal Environment of the Gisborne District is defined in Part E of the Tairāwhiti Plan and shown on the planning maps. This Coastal Environment is particularly susceptible to a number of coastal hazards because the majority of people in the Gisborne District live close to, or use, the coast. These include: Tsunami, Storm surge inundation, Erosion, River mouth movement and Dune and Coastal Sediment movement. All of these events have occurred in the past within the Gisborne District. The entire Gisborne District coastline is subject to, and is likely to continue to be subject to, adverse effects from one or a combination of the natural hazards of sea and wind erosion, landslip and flooding from the sea and coastal rivers. Natural coastal hazards are an example of an issue which straddles the administrative boundary between the land and sea set up in the RMA. The majority of the coast has undergone an initial assessment of sensitivity to coastal hazards (ASCH). This represents a rapid and less rigorous assessment of the extent to which an area is subject to coastal hazards over a 100 year planning horizon. For areas where there is an identified coastal hazard problem, a rigorous and complete Coastal Hazard Overlay assessment has been undertaken. The assessments are based on an acceptable level of risk, and strike a balance between the expectations of members of the community to be able to use their land against the need to protect life, adjacent property, and values from coastal hazards on the other.

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Maintainer GisborneDistrictCouncil
Source Created 2019-10-01T01:40:41.000Z
Source Modified 2019-11-26T23:22:48.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[177.9372, -38.7706], [178.3567, -38.7706], [178.3567, -38.105], [177.9372, -38.105], [177.9372, -38.7706]]]}
Source Identifier
Dataset metadata created 9 December 2019, last updated 3 March 2020