Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Liquefaction report for Timaru released

25 March 2014

Liquefaction report for Timaru released

Environment Canterbury today released a review of liquefaction information for Timaru District, indicating that only small amounts of liquefaction may happen in a large earthquake.

The review report, commissioned by Environment Canterbury and the Timaru District Council and produced by Geotech Consulting Ltd, summarises and updates liquefaction studies from the last 15 years.

Environment Canterbury Commissioner Donald Couch says the review targets areas that have been identified in the past as potentially liquefiable in a big earthquake and offers guidance about appropriate levels of geotechnical investigation at the time of subdivision or development.

“This comprehensive piece of work gives the community better information for those considering building,” Mr Couch said. “It essentially confirms what was already known – there is very limited liquefiable ground in Timaru District, meaning only small pockets of liquefaction are likely.

“It does not tell individual landowners whether there is a risk of liquefaction on their particular property, but there are ways to get information about their properties and it will show them when liquefaction hazard investigation should be included in consent applications. It will also avoid their being asked for liquefaction hazard investigations in areas where potential for damage is low.”

The report includes the results of new geotechnical testing in specific areas of Timaru and Geraldine. It shows that ground that is more susceptible to liquefaction is in low-lying areas close to the coast, and along rivers and floodplains.

“The most susceptible areas are valley bottoms close to the coast in Timaru City, between Washdyke Lagoon and Saltwater Creek. The area subject to river engineering works at Washdyke Creek is not susceptible, however,” Mr Couch said.

“Timaru Port is an area of low susceptibility. Much of Redruth, including the area currently occupied by the landfill, may need further investigation to make sure the liquefaction hazard is appropriately managed.”

The main purpose of the report is to provide Timaru District Council and the community with general guidance on where geotechnical investigation and engineering assessment of liquefaction potential may or may not be required for plan changes, and for subdivision and building consents. It may also be useful for lifeline utility and emergency management planning.

“The report divides the district into four areas of relative liquefaction susceptibility ranging from ‘nil to extremely low’ potential to ‘moderate’ potential,” Mr Couch said. “Liquefaction assessment is needed in two of these areas. Nowhere has been identified where development may lead to unacceptable economic risk.”

The report identifies potential liquefaction hazards in respect of land use planning for general residential and light commercial development. It does not provide information for major infrastructural and critical facilities.

Mr Couch advises potential purchasers in Timaru District and elsewhere always to get a LIM. “You might also need an investigation for hazards other than liquefaction – for example, for susceptibility to land subsidence,” he said.

“This report will help ensure that costly liquefaction investigations will not be required in areas where they are not needed and will be focused on areas where they can ensure appropriate building solutions.

“This is the way it should be towards making sure our buildings are as safe as possible for the future of Canterbury,” Mr Couch concluded.

For more on the report and related information go to www.ecan.govt.nz/liquefaction

Background

The occurrence of liquefaction depends on whether underlying soils include liquefiable sediments, which have very distinctive characteristics, and whether these sediments are saturated by water (under the water table).

In the report:

• Zone 1 land (“moderate potential”), which covers a very small part of the district, has the highest liquefaction susceptibility and all new development should have appropriate site investigations and liquefaction assessment by a suitably qualified geotechnical engineer or engineering geologist.
• Zone 2 land (“low potential”) may contain areas of liquefiable ground, and liquefaction assessments should be carried out for new subdivisions at consent stage.
• The geological nature of the ground in zones 3 and 4 (“very low” and “nil to extremely low” potential) is such that future earthquakes are unlikely to cause land damage from liquefaction.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

"New Faces, Wise Heads": Andrew Little Announces New Labour Line Up

Labour Leader Andrew Little today announced a bold new caucus line up which brings forward new talent and draws on the party’s depth of experience.

“Labour has many new and highly capable MPs who will have the opportunity to prove their ability. At the same time our senior hands will be on deck to take the fight to the National-led Government and support our upcoming stars,” Andrew Little says.

“I am pleased to announce Annette King will be my deputy for the coming year. In recent weeks she has shown how crucial her wisdom and strength is to Labour. More>>

 

Parliament Today:

Passport Cancellation, Surveillance: Draft 'Foreign Fighters Legislation' Released

The final draft of the Countering Terrorist Fighters Legislation Bill contains proposals previously announced by Mr Key in a major national security speech earlier this month. More>>

ALSO:

Related

Joint Statement: Establishment Of NZ-China Strategic Partnership

At the invitation of Governor-General Lt Gen The Rt Hon Sir Jerry Mateparae and Prime Minister The Rt Hon John Key of New Zealand, President Xi Jinping of the People’s Republic of China made a state visit to New Zealand from 19 to 21 November 2014... More>>

ALSO:


Savings Targets: Health Procurement Plan Changes Direction

Next steps in implementing DHB shared services programme Health Minister Jonathan Coleman says the Government has agreed to explore a proposal put forward by DHBs to move implementation of the shared services programme to a DHB-owned vehicle. More>>

ALSO:

More on Health Policy:

Auckland Unification: 'No IT Cost Blowout' (Just More Expensive)

Following discussion of an update on Auckland Council’s Information Services Transformational Programme at today’s Finance and Performance Committee, council has released the report publicly. More>>

ALSO:

Other Expensive Things:

Gordon Campbell: On The SAS Role Against Islamic State, And Podemos

Only 25% of the US bombing runs are even managing to locate IS targets worth bombing. As the NYT explains at length, this underlines the need for better on-the-ground intelligence to direct the air campaign to where the bad guys have holed up... More>>

ALSO:

Public Service: Commission Calls For Answers On Handling Of CERA Harassment

EEO Commissioner Dr Jackie Blue is deeply concerned about the way in which the State Services Commission has handled sexual allegations made against CERA chief executive Roger Sutton this week and is calling for answers. More>>

ALSO:

Gordon Campbell:
On Andrew Little’s Victory

So Andrew Little has won the leadership – by the narrowest possible margin – from Grant Robertson, and has already been depicted by commentators as being simultaneously (a) the creature of the trade unions and (b) the most centrist of the four candidates, which would be an interesting trick to see someone try in a game of Twister. More>>

ALSO:

China President Wishlists: Greens Welcome Xi, But Human Rights Need To Be On Agenda

“President Xi has made some progress on climate change, but he must also lift the Chinese government’s game on human rights issues,” Green Party Co-leader Dr Russel Norman said... It is important that our Government continues to urge the Chinese government to show restraint and respect human rights in both Tibet and the Xinjiang province.” More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news