More than 130 property owners in Christchurch's Port Hills are to fight the red and green zoning of their land.
The Canterbury Earthquake Recovery Authority (Cera) said that 133 applications for a zoning review had been received by the deadline on Friday night.
The review does not apply to those properties subject to Christchurch City Council section 124 notices, which bar owners from entering because of damage caused by Canterbury's two big earthquakes.
Cera on Friday also released the findings of a geotechnical study on rockfall hazards in the Port Hills.
The report by Australasian geotechnical firm Geovert using 3D modelling showed barriers could protect 95 per cent of Port Hills properties from falling rocks.
Cera chief executive Roger Sutton said the report was used alongside other investigations and work commissioned by the city council to give the government the best advice for zoning decisions.
Around 30 kilometres of barriers could be built at a minimum height of 3m within 30 months, the report said.
"Based on Geovert's extensive experience both locally and international as a specialist in this area of construction we are very confident the programme provided is realistic and achievable," Geovert said in the report.
Earth bunds were also feasible but needed easy access and flatter land and another option of trying to shift or stabilise the rocks would be expensive and difficult.
The cost of bunds and barriers was calculated but not made public as the information was commercially sensitive.
Cera said property owners seeking a zoning review would have until November 16 to include any relevant information from the rockfall report.Results of the review are expected in December.
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