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

 


New Liquefaction Report Will Help With The Rebuild


January 31, 2013

MEDIA STATEMENT
New Liquefaction Report Will Help With The Rebuild

Environment Canterbury today released a review of liquefaction information for Christchurch and neighbouring districts outside the green and red zones.

The review report maps areas where building projects will no longer need expensive 15-metre deep ground tests and other areas where these tests will still be required.

The report covers 20 years of liquefaction studies and draws on the experience of the 2010 and 2011 Canterbury earthquakes. Environment Canterbury Commissioner Donald Couch says the report provides an up-to-date assessment of the need for geotechnical investigation of liquefaction-susceptible ground in eastern Canterbury.

“This comprehensive piece of work gives our communities better information for those considering building outside areas already zoned by the Canterbury Earthquake Recovery Authority,” Mr Couch said.

The main purpose of the report is to provide territorial authorities and communities 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 covers the Christchurch City Council area, including Banks Peninsula, and eastern parts of the Waimakariri, Selwyn and Hurunui districts, but does not include other parts of Canterbury or land that has already been zoned by CERA,” Mr Couch said.

“A map in the report shows areas of solid ground where damaging liquefaction is unlikely and areas of more variable ground quality where liquefaction assessment is needed during site investigations.”

This means that for many areas of Canterbury, fewer deep geotechnical investigations will be required than at present, while those that are carried out will be better targeted.
“You might still need a shallower geotechnical investigation for other hazards though – for example, for susceptibility to flooding or land subsidence,” Mr Couch said.

Kelvin Berryman of GNS Science says his organisation, and the Natural Hazards Research Platform he chairs, were pleased to be involved in co-ordinating and funding the report. “I am sure the results of this collaborative effort will be very helpful for the Christchurch rebuild and appropriate building work throughout Canterbury,” Dr Berryman said.

Environment Canterbury has been liaising closely with territorial authorities, CERA and the Ministry of Business, Innovation and Employment to help inform their natural hazards and building consenting activities.

“It is pleasing that this collaborative work is resulting in the development of consistent processes through MBIE’s Building & Housing Guidelines, which now include a section on liquefaction testing specifically taking account of this report,” Donald Couch said.

“The practical effect of this is that costly investigations will no longer be done 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 in helping make sure our buildings are as safe as possible for the future of Canterbury.”

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

For the revised Building & Housing Guidelines, go to (16.2)
http://www.dbh.govt.nz/UserFiles/File/Publications/Building/Guidance-information/pdf/canterbury-technical-guidance-subdivisions-part-d.pdf

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.

The area where future “design-level” earthquakes (http://ecan.govt.nz/advice/emergencies-and-hazard/earthquakes/Pages/liquefaction-faqs.aspx#seven) are unlikely to cause land damage from liquefaction includes the western part of the project area and most of Banks Peninsula.

The area where future design-level earthquakes may cause ground damage from liquefaction (and the effects may be complex and damaging to ground, buildings and infrastructure) includes the eastern part of the project area and some low-lying areas of Banks Peninsula.

The Natural Hazards Research Platform is the funding body that co-ordinates central government natural hazards research funding. It includes GNS Science, NIWA and tertiary sector organisations.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

 

PARLIAMENT TODAY:

Labour: Cash For Charter Schools, Mould For State Schools

“Recently released financial statements show the Whangarei charter school He Puna Marama received $3.9 million in government funding to the end of last year. Yet their audited accounts show they only spent $1.4 million on education, leaving almost $2.5 million over two years unaccounted for." More>>

ALSO:

Kiwirail Plans Shift From Electric: National Urged Not To Take Backwards Step

The National Government shouldn’t drag New Zealand backwards by replacing its climate friendly electric trains with carbon-polluting diesel trains, the Green Party said today. More>>

ALSO:

Capital Connection:

Harmful Digital Communication Bill Passes: Focus Must Be On Education

InternetNZ acknowledges the passage of the Harmful Digital Communications Bill into law this afternoon, and says that the sooner the education efforts at the heart of the legislation start, the better... More>>

ALSO:

3-Year Transport Plan: No Plans On Six Northland-Election Bridges

The Transport Authority’s decision to fund only four of the 10 bridges promised in National’s shameless Northland by-election bribe is a huge embarrassment for Transport Minister Simon Bridges, Labour’s Transport spokesperson Phil Twyford says. More>>

ALSO:

Gaza Blockade: Māori TV Crew Returning Safely From Israel

A Māori Television crew will be flown back from Israel after their boat was detained by the Israeli Navy while attempting to break the Gaza blockade. More>>

ALSO:

Family Violence: Increasing Reporting But Fewer Resolutions

“We are aware the Police have embarked on a significant programme of change in how they respond to family violence. The data suggests that adequate resourcing including investing in staff training, support and culture change will be required for this to be effective.” More>>

ALSO:

Health: NZ Children Still Suffer Rickets From Lack Of Vitamin D

Vitamin D deficiency continues to cause rickets in young New Zealanders, new University of Otago research has found. The researchers say that their finding suggests that at-risk mothers and children should be better targeted for Vitamin D supplementation. More>>

Also GPs, Housing, Milk: PM Press Conference On The UN Security Council

In a press conference today the Prime Minister discussed the upcoming appointment of New Zealand to chair the UN Security Council. He said they would put pressure Asad in Syria and attempt to “jump start” negotiations between Israel and Palestine. More>>

ALSO:

Housing: State Houses Could Sell To Overseas Groups

Bill English’s admission that he would sell hundreds of New Zealand’s state houses to the Australians is the latest lurch in the Government’s stumbling, half-baked housing policy, Labour’s housing spokesperson Phil Twyford says. More>>

ALSO:

AND:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news