West Coast land instability risks outlined

Deborah K. Vick


Area with land instability – including Greymouth, pictured, have been identified and hazard plans for each will be incorporated in the draft Te Tai o Poutini Plan.


Space with land instability – such as Greymouth, pictured, have been recognized and hazard options for each will be incorporated in the draft Te Tai o Poutini Prepare.

West Coasters anxious about the hazard of normal activities this kind of as earthquakes, major rain, and landslips impacting their residence can now offer suggestions on a new organic hazards document. Community democracy reporter BRENDON McMAHON experiences.

New rules for new buildings and structures in parts discovered as staying at danger from land instability dangers will apply underneath a proposed new approach.

This signifies the style of action in all those spots will be reliant on assembly discretionary necessities in get to establish.

This will contain offering geotechnical assessments and other proof, such as the proposed building action being secure from slope instability, and will not be probably to consequence in or contribute harm to any adjoining or down slope residence within just the all-natural hazard overlay location. 

The draft Purely natural Dangers Provisions for Coastal and Land Instability document has been formulated using current purely natural hazard reports held by the West Coastline Regional Council, and the erosion susceptible locations determined in the council’s Land and H2o Strategy.

Examine Additional:
* New West Coastline district system goes out for very first search
* Seven thousand Nelson properties additional to ‘slope instability’ record
* 2700 Waimakariri properties at ‘high risk’ of flood in purely natural dangers maps

The guidelines for land instability relate to sensitive activities – these are household houses, customer lodging, community and schooling services and retirement houses – the kinds of pursuits most at threat from land instability hazards

The doc, element of the region’s new Te Tai o Poutini Plan, is offered for public comments at a series of roadshows and general public fall-in meetings across the location this 7 days until Friday.

It includes spots now identified in the Grey, Westland and Buller District Designs as staying topic to sizeable land instability.

Afflicted spots contain:

  • Very little Wanganui
  • Mokihinui to Ngakawau
  • Sections of the Coast Highway (north of Fox River, Maybelle Bay, Fourteen Mile, 10 Mile, Rapahoe Bluff)
  • Greymouth erosion susceptible spot
  • Otira and Knights Position.


The substantial Alpine Fault is due for a different large earthquake and experts have been drawing up a state of affairs of what the devastation would glance like. (To start with posted Might 2018)


A Land Instability Hazard overlay is identified across the hills forming the backdrop of Greymouth – from the Kings Park space higher than the Greymouth CBD and next the coastal strip in direction of Paroa.

This features the Twelve Apostles Assortment and the hills at the rear of Greymouth and Paroa down to Marsden Rd and across in direction of Boddytown and Marsden.

The land instability map handles very a large location, which includes locations zoned for further more advancement of Greymouth.

The draft document says these regions are anticipated to be equipped to be made, but will call for really precise engineering style of foundations to deal with the risks of the sluggish slip erosion occurring there.

Appropriately, a source consent will be essential to help that possibility assessment.

Rockfalls are a risk near Rapahoe and on the Coast Road.


Rockfalls are a danger close to Rapahoe and on the Coast Street.

Rapahoe and Coastline Street rockfalls

The Coast Road is subject matter to land instability from rockfalls at Ten Mile and Rapahoe Bluff, just north of the Rapahoe residential spot.

New delicate activities this sort of as residential or customer lodging will call for a source consent for those regions with a essential danger assessment to identify how the rockfall possibility can be mitigated, this kind of as by specific engineering design and style or defense functions.


Punakaiki township is subject to several dangers which include threats from the coast and also the hills higher than.

Punakaiki is at risk from rockfall and threats from the coast.


Punakaiki is at chance from rockfall and threats from the coast.

The location underneath the cliffs in Punakaiki identified in the land instability overlay has a large threat of rockfall.

In this spot new delicate actions these kinds of as houses and visitor accommodation will require a useful resource consent – with a hazard assessment to show how the building will be secured from the rockfall hazard.

Tiny Wanganui

Very little Wanganui is influenced by the two coastal hazards, and in the subdivision spot, rockfall dangers.

The whole Minimal Wanganui subdivision area is protected by the land instability overlay, owing to the considerable hazards from rockfall.

New properties or baches will call for a useful resource consent, with a in depth rockfall hazard assessment to identify how the threat would be mitigated.

Coastal hazards and rockfall hazards put Little Wanganui at risk.


Coastal dangers and rockfall hazards place Minimal Wanganui at danger.

Present use legal rights

The All-natural Hazards procedures in the Te Tai o Poutini Plan will not affect the potential to continue on existing lawfully established routines.

Where by there are present lawfully proven structures inside a organic hazard (or other) overlay at the time of notification of the program, those will have present use rights under the Source Management Act.

Current use rights mean a specific creating can carry on to be maintained and occupied without the have to have to get a useful resource consent below the plan.

Ought to the constructing be destroyed or damaged, then offered it is replaced in just 5 decades, it can be replaced or reconstructed with a creating of a very similar sizing, place and intent with no any have to have for a resource consent, offered that the substitute building does not enhance the diploma to which the setting up fails to comply with the regulations in Te Tai o Poutini System

The authorized requirement for a substitute is 12 months – this timeframe has been extended under the draft as alternative constructing can acquire considerably extended.

The developing that replaces a wrecked or damaged building does not have to be similar to the authentic constructing, just has to be “the exact or identical in character, intensity and scale”.


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