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District Plan Review - Draft Plan Change 53

Natural Hazards

We are required to manage activities, including development, in areas subject to natural hazards. The natural hazards in rural areas of our District are flooding, earthquakes, landslides, coastal erosion and deposition, wildfire and tsunamis. The risk associated with any one of these depends on its location.

What work has been done?

We consulted on natural hazard issues and options in May-July 2015. We incorporated feedback into a report that describes the nature of local hazard, the information available and the legal requirements for managing them. The report recommended options for managing the effects of natural hazards through the new District Plan. This report and its recommendations have formed the basis for the development of the proposed natural hazard provisions.

What are the proposed changes?

New resource management objectives and policies are proposed to be introduced to ensure:

  • New subdivision and development avoids or mitigates the adverse effects of natural hazards on people, property, infrastructure and the well-being of the community.
  • Activities and development do not reduce the effectiveness of flood control infrastructure.
  • The community is better informed about the potential risks of natural hazards.

It is also proposed to identify flooding and tsunami hazard areas in the district planning maps and manage specific activities within these areas, through the use of rules. For the other natural hazards there is either not enough information on them or there are other methods (i.e. the Building Act) for managing land use in areas subject to natural hazards.

Flood hazards

The flood hazard area is defined as land known, through flood modelling and/or observations of previous flood events, to be at risk from a 0.5% Annual Exceedence Period (1 in 200 year) flood event. Parts of the existing flood hazard areas have been revised with the latest flood modelling information from Horizons Regional Council. This modelling has resulting in a revised flood hazard layer in some parts of the District. The flood hazard area is also proposed to be split into two areas depending on the nature of the hazard. The two flood areas are proposed as follows:

  • Flood Hazard Area 1 - Land that could be subject to deeper and/or high velocity floodwater. This includes flood-ways such as the Reids Line, Taonui basin and Kopane and land adjacent to water ways.
  • Flood Hazard Area 2 - Land that could be subject to inundation and water ponding in a flood event. This includes low-lying areas known to be subject to flooding based on modelling and previously recorded events. It also includes areas adjacent to drains and waterways.

Most activities in the flood hazard areas will continue to be permitted. It is proposed resource consent will be required for:

  • Occupied structures such as houses and places of work
  • Critical infrastructure such as wastewater pipes and power lines
Coastal hazards

Land adjacent to the coast can be affected by a range of coastal specific hazards, including erosion, flooding and tsunami. Horizons has mapped areas (evacuation purposes) susceptible to tsunami. Council has used this data to add a Tsunami Hazard Area to the District Planning maps. It is proposed that resource consent will be required for the following activities in the Tsunami Hazard Area:

  • New occupied structures and extensions to existing ones
  • Critical infrastructure

What areas are affected by the changes?

The map in Figure 1 shows the extent of the updated Flood hazard areas and the new Tsunami hazard area.

Want to know more?

Click the following links to view the proposed changes to the District Plan:

To discuss how the Draft Plan Change 53 - Natural Hazards may affect you, contact: Cynthia Ward, Senior Policy Planner - E: cynthia.ward@mdc.govt.nz - P: 06 323 0000

Submissions are now closed