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




UPDATE: 25-year-old man dies in Benaraby collision, video:

Fatal motorbike accident at Benaraby.Photo Mike Richards / The Observer

Its been confirmed the man who died at the scene of the crash was 25

LETTER: Can’t keep up with in and out phone service, Boyne Valley resident says

FED UP: Boyne Valley residents want answers about the poor phone service. But mostly they want action.

"God help us in another 10 years" Valley resident fed up

UPDATE: Family Pit Bull mysteriously reappears after reported stolen

Kirrily Southall's pet dog stolen from her between hours of Friday night and early Saturday morning. Inset, one of the bones found in her Calliope backyard.

SHE didn't give her dogs bones, so who did? And where is Loki?

Latest deals and offers

Guy Sebastian a hit at Splendour in the Grass

Guy Sebastian performs at Splendour in the Grass with Paces.

REALITY TV judge a hit with festival crowd.

Superheroes of the big screen enjoy sounds of Splendour

CHRIS Hemsworth and his Avengers mates drop by Byron festival.

Indigenous artist shows tourists secrets of Aboriginal painting

Ever thought "I could do that" about Aboriginal art?

Dynamic pics from Splendour Day 1

The Strokes perform at Splendour in the Grass 2016. Photo Marc Stapelberg / The Northern Star

Check out the latest pictures from Splendour in the Grass.

Bindi Irwin: 18 magic photos to mark her 18th birthday

Bindi Irwin with a python.

Photos: Bindi Irwin from babyhood to 18

Aussie director makes his mark on new Roots mini-series

Malachi Kirby as Kunta Kinte in a scene from the TV series Roots.

BRUCE Beresford behind final episode of remake of iconic series.

You can own this Queensland town for just $1

Yelarbon

Unprecedented auction of town's business centre with no reserve

Work starts on $15M Caloundra apartment building

Turning the first sod at the Aqua View Apartments site in Kings Beach are (from left) husband-and-wife developers Alex Yuan and Stella Sun with construction company Tomkins director Mike Tomkins and Councillor Tim Dwyer.

Developers excited about addition to Kings Beach skyline

72-year-old Coast developer set to start new project

GREEN LIGHT: The Cosmopolitan has been approved for development at Cotton Tree.

Meet the Canberran set to deliver another chapter for Coast suburb

Plans revealed for 1500-lot 'master-planned community'

Precinct will be bounded by Boundary St and Shoesmith Rd

Ecco Ripley sales run sparks prime release

MOVING IN: Sekisui House has announced the release of more residential blocks at Ecco Ripley.

Sekisui House is preparing to unveil more land at Ecco Ripley

The climb is slow but property on the way up

Michael Matusik, director of Matusik Property Insights.Photo Allan Reinikka / The Morning Bulletin

The improvement would be mild when compared to past cycles