News

Gladstone Harbour bund wall a lesson in what not to do

FAILURE to contain dredged spoil material within a designated bund wall in Gladstone Harbour has provided the perfect case study of what not to do.

Senior engineers Bill Service and Warren Hornsey believe the failure of the bund wall at Fishermans Landing in 2011, during the dredging of 25 million cubic metres of sediment to accommodate LNG projects on Curtis Island, could be attributed to a lighter weight geotextile than that designed for the project, and the layering of the protective geotextile cloth on the inside of the bund wall, rather than the outside as originally specified.

Run-off effects were exacerbated through tidal changes causing stress to the protective layer.

A presentation about the bund wall failure was shown to the Great Barrier Reef Marine Park Authority on Friday.

The authority is now asking questions about the scrutiny of future dredging operations in Queensland, and has decided not to give a permit to allow dredging spoil to be dumped in reef waters until further tests are finished in late January.

Brisbane Times reports Mr Service and Mr Hornsey, say the leaking was caused by problems with the lining - which was thinner than originally proposed - and not being placed within the bund wall.

"This resulted in a porous wall, which relied on a geotextile fabric lining material to prevent fine dredged spoil from leaking through the wall," the authors said.

"Unfortunately, problems arose with the lining, resulting in significant leakage of dredged spoil."

"The rising tide caused the geotextile cloth to split horizontally; in some cases the geotextile was not secured at the bottom and simply lifted up; and there were crumpled areas, tears, rips and holes due to the water movements," the report said.

State and federal laws designed to protect marine fauna and flora state the wall must be structurally sound and have minimal impact on nearby seagrass beds.

Permit requirements to proceed stated "contaminants resulting from dredge spoil disposal ... must be released only to surface waters at the north-east corner of the reclamation area".

A concluding comment attributed to Dr JP Giroud provided a sombre reflection, which might indicate Gladstone has earned its place as a dredging dilemma.

"Geotechnical engineers who do not learn from the mistakes made by others, will learn from the mistakes made by themselves."

Topics:  bund wall dredging gbrmpa gladstone harbour



How to survive a bushfire in your car

IT SOUNDS like a nightmare, but it can happen.

Eight reasons to join the RFS

SPREAD across 93% of Queensland, the Rural Fire Service has about 36,000 volunteers. And you could be one of them.

What if my insurer gives me grief?

CLAIMING your insurance cover after a natural disaster can go one of two ways. It can be a breeze, or like pulling teeth.

'He can see!' Mum's tears as boy fights Taipan bite

Eli Campbell, 2, is recovering at Brisbane's Lady Cilento Children's Hospital after he was bitten by a taipan three times at Agnes Water.

Todder bitten by a snake can now see, talk and walk.

LNG giants handed short term lifeline

PRICE SURGE: Oil prices boosted after OPEC agrees to cut production.

LNG shares jump after epic OPEC deal

Local Partners

David Attenborough on facing his mortality

Sir David Attenborough in a scene from the TV special The Death of the Oceans.

Life without Sir David Attenborough is hard to imagine

Goooodbye Hamish and Andy (from our radios)

Hamish and Andy

The pair have been on air since 2006

Saying "I do" changed Shia's outlook on marriage

Shia LaBeouf has a new outlook on marriage since he tied the knot.

Singer tunes in to first movie role

Tori Kelly voices the character Meena in the movie Sing.

Musician Tori Kelly voices Meena the teenage elephant in Sing

Cricketing greats bring Aussie mateship to commentary box

Cricket commentator Adam Gilchrist.

ADAM Gilchrist enjoys the fun of calling the Big Bash League.

The dead help solve the case

Debut novel delivers on wit, violence and shock

Chinese locked out of Australian property market

The rules are different if you're a foreigner

The buyer was from China - the trouble started right there

Morrison signs off on new affordable rental model

Australia's Treasurer Scott Morrison speaks during a press conference after a meeting of the Council of Federal Financial Relations at Parliament House in Canberra, Friday, Dec. 2, 2016.

Scott Morrison signed off on development of a new financing model

Family scoop bargain $160K 'holiday home' in Gladstone

BARGAIN: A Biloela family has purchased 21 Ann St for $160,000. They try to get to Gladstone at least once a month.

ADVERTISED as "renovate or demolish", but snapped up for getaway.

REVEALED: Gladstone property prices hit lowest in downturn

Aerial View overlooking Kin Kora residential area, Gladstone.



Photo Brenda Strong / The Observer

GLADSTONE PROPERTY prices have hit their lowest since the bust.

Coast high-flyer's fight back from bankruptcy, $72m debt

Scott Juniper went from millionaire developer to declaring bankruptcy in2012, now he is back on top of his game again with new developments including this one in Coolum.

'Apocalyptic lending storm' causes financial collapse.

Ready to SELL your property?

Post Your Ad Here!