'Ground-truthing' work at Port Hills begins

Last updated 13:35 28/01/2012

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Work to determine whether rockfall-threatened areas of the Port Hills can be repaired has begun.

Geotechnical engineers this week began "ground- truthing" work as part of the final draft of a GNS Science report on life risk prepared for the Christchurch City Council.

The life-risk model takes into account the location of properties in relation to hazards, physical features such as slope gradients and the likelihood of further quakes. Ground-truthing involves site-specific assessments of hazards identified through the modelling.

About 395 of the 524 properties that were issued section 124 notices under the Building Act, which replaced red stickers, will be covered.

Council regulation and democracy general manager Peter Mitchell said the ground- truthing would identify where any notices could be lifted because the property was not in danger of rockfall, and areas suitable for long-term protective works that would result in notices being lifted.

"Geotechnical engineers may find there are areas or specific properties where the risk of rockfall and boulder roll is extremely high.

"If so, they will inform the council so that action can be taken to keep residents safe. This has been occurring as part of ongoing assessments for the past six months."

The 129 properties issued notices for cliff collapse or other hazards, such as access or retaining walls, are not covered.

Mitchell said no dates for ground-truthing of these other hazards had been agreed with GNS Science as the modelling or reports for these hazards were still in development.

Geotechnical engineers would start where section 124 notices prohibiting entry to buildings had been issued, then move through other areas and suburbs in the hills, he said.

"It is important to note that the methodology that has been developed is a first for New Zealand and as such a calibration exercise must be completed to ensure that the work being undertaken delivers a consistent result for all residents affected," Mitchell said.

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14 comments
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You're wrong Murray   #14   10:34 am Jan 30 2012

You simply cannot compare NZ and Japan. A friend of mine lived in the damaged part and there is a huuuuge difference.....there is NO insurance there for this kind of thing so people have lost their homes and businesses and have no need for "zones" as they wont be getting any help...

We should be grateful for the country we live in that we are prepared for this kind of disaster and our lives are not rruined because of it - yes, we are suffering and yes some peoples lives have been turned upside down, but it is extremely wrong and arrognat to compare the two countries when ours is leaving us so much better off.

Anony Mouse   #13   10:44 pm Jan 29 2012

'Ground-truthing' - what idiot coined that hashed-together word.

Why not say that "we are going to check for loose rocks", and make your house safe if we can.

Let us all hope that the hyphenated flotsam is a'going to vanish from "The Press" lexicon, really soon.

A simple pair of lines of high-strength netting, one below the other, will catch most rockfalls.

Meanwhile, I would never live under those cliffs, knowing that the rock is poorly attached, weaker and weaker as you move eastwards, because of how it solidified...

Kind regards.

Anony Mouse

WJ   #12   08:38 pm Jan 29 2012

I relate to Ms Cynical #5 as we are in exactly the same boat (probably with filled with more people than we will ever know). Ground-truthing - give me a break. Does CERA buy into this? This shouldn't stop the remaining white and orange zone decisions. Along with a lot of people commenting - I have to add that all CERA seem to have done in a year (apart from bus tours) is colour code us all - and now they want to ground truth some - how about actually DOING SOMETHING.

Democracy Manager?!?   #11   07:10 pm Jan 29 2012

Guess Peter Mitchell is having an epic fail managing the Bob and Tony version of "democracy".

Try holding another council election and you'll find out about democracy Peter.

Ed2   #10   02:59 pm Jan 29 2012

I'll give them ground truthing. I got an email from the Port Hills team on Friday telling me that I have to stay away from my home (red stickered) while this 'ground truthing' continues and I still can't believe it as they say that ".... it's complicated....", but "we will give you counselling". COUNSELLING - how absolutely arrogant is that. We are not simply a bunch of cows who can be herded out of one paddock while repairs are carried out in another. We have mortgages to pay just like the rest of you.

Ed2   #9   02:57 pm Jan 29 2012

For goodness sake, it would take one engineer driving around the cliffs of Redcliffs, Sumner, Mount Pleasant and a large number of homes could be turned from white to red. Stop this nonsense now and get people's lives on track.

pw   #8   02:56 pm Jan 29 2012

What about those left in the orange and white zones? It is time for answers CERA. Where is Roger?

Hilary D.   #7   02:55 pm Jan 29 2012

'Ground truthing' - sounds like some engineers are making a lot of money. I'll give them a 'truth'. This is a 'yes' or 'no' answer. If a house has a large boulder sitting above it, the question is - can the boulder be destroyed or diverted? If the answer is "No", the house below should be zoned red and paid out. It's that simple.

jono   #6   11:53 am Jan 29 2012

#2

its amazing how the japs just get on with it, cleaning up and rebuilding... whereas here we just sit back, fill in our EQC forms, and complain bout our sticker colours.

so much red tape its easier to just whine to our councils and their fat salaries

Ms Cynical   #5   10:40 am Jan 29 2012

Does anyone at Democracy Services think of the dislocated people in the orange and white zones? They are going to be the last ones to have a home again. If we are lucky and get zoned in the next couple of months, it will take a minimum 3 years from the 1st quake to get a home again. If we are lucky. In the meantime 3 years of paying mortgage for nothing, rent and 2 rates and relocation costs multiple times, from 1 salary. By now we want to leave but not before we can close the last 30 years of our life here. Mr Mitchell, let us have some closure - ASAP. We are both on anti-anxiety medication now (never before in our life), not from the quakes but from the impossibility of being able to move forward. Did I mention insurance struggles?


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