Login | Register

Rockaholic Adventures

Rockaholic Adventures is the place for conversation and discussion about outdoor excursions. You'll also read reviews written from the perspective of today's technologically-advanced outdoorsman – one with a background in engineering and geology. Here, you'll find everything from discussions about geology-related engineering disasters to insights about how advances in technology have transformed modern-day extreme sports.

Rockaholic Adventures also covers topics such as urban planning and other anthro-induced changes to the access and preservation of natural areas. The blog's owner, Shawn, holds an A.S. from Hudson Valley Community College (HVCC) with a concentration in science and engineering, and a B.S. from the State University of New York (SUNY) at Albany with a major in geology.

  Next in Blog: New Orleans: ‘Til the Levee Breaks
Close

Comments Format:






Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







3 comments

Remembering the Vaiont Dam Disaster

Posted March 06, 2008 9:52 AM by Shawn
Pathfinder Tags: dam slope failure

The Vaiont Dam was built in 1961 in northeastern Italy. Two years later, a massive rock slide produced a 200-ft wall of water that spilled over the top of the dam and drowned over 2,000 people. The Vaiont Dam Disaster was not due to a poor foundation or other structural flaw. The problem was that geologists and engineers underestimated the probability of a slope failure.

Two years after the Vaiont Dam was built, its reservoir was nearing capacity and raised the surrounding water table. This change, when coupled with heavy rainfall, contributed to increased pressure between consolidated sediments. Tragically, a slope failure occurred, sending millions of cubic meters of land mass into the Vaiont Dam's reservoir. The resulting wave spilled over the top of the Vaiont Dam. Although the 860-ft high structure survived, the surrounding villages were swept away.

The ecological impact of placing a dam in an ocean-bound river is significant, of course, but there are other geologic considerations that are just as important when building such a structure. The geology of the Hoover Dam near Las Vegas, Nevada was studied extensively before construction began. The drilling of bedrock and an investigation of the stability of neighboring sediments was of key interest. The builders needed a solid foundation that would stand the test of time before the river evolved and eroded a spillway underneath the dam, which may still happen some several hundred years from now.

Tragically, the builders of the Vaiont Dam believed that a catastrophic failure of the valley side was unlikely. Understanding the importance of building any structure on a solid foundation and understanding its impact on the local environment has resulted in many guidelines and regulations. Today, these guidelines seem over taxing to some people, yet we still watch houses on the U.S. West Coast fall into the Pacific Ocean as million-dollar mansions suffer the same fate as the mountainside upstream from the Vaiont Dam.

Reference:

http://www.geocities.com/geogsoc2000/Vaiont1.htm

http://www.answers.com/topic/vajont-dam?cat=travel


Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Power-User

Join Date: Mar 2008
Posts: 345
Good Answers: 1
#1

Re: Remembering the Vaiont Dam Disaster

04/01/2008 11:39 AM

Yeah... I know what you mean. It's not an easy scenario been around one of those huge Dam with mountains and lakes in top of that. A lot of times we see how many communities are let being forced to build their "Housing" nearby these conditions because they can't afford to live anywhere else having to conform with are the available living space for their budgets. life is to fragile specially when in poor budgeting circumstances, I know...

I wish to see the goverment and the UN or whoever in that power to do make out a survey of those populations and communities around the planet living day by day under such poor living risky scenarios dealing and playing an accident waiting to happen. It's a shame.

Allset folks watch out and thanks a lot for the good feedback here about such issues. Have a nice one now. GOD BLESS..!

Respectfuly,

MC

Guest
#2

Re: Remembering the Vaiont Dam Disaster

10/12/2008 6:51 PM

Dams are high maintence dangerous items of infrastructure - we think in the west that due to good design and planning we are immune to dam failure and loss of life.

I have concerns that Australias water infrastructure managers may not be up to the responsibilities involved.
By this I mean the states, water corporations like Wide Bay Water and local governments.

This is what the public discovered in Hervey Bay QLD Australia at Lenthalls Dam when the crestgates designed by flowgate projects failed to lower as designed and the public were put at risk.

I have concerns that Australias water infrastructure managers may not be up to the responsibilities involved.
By this I mean the states, water corporations like Wide Bay Water and local governments.

Our own experience of dam gate failure at Lenthalls Dam on the Burrum River is a telling - it is indicative of an inability to understand risk and manage public saftey issues


You would imagine that Dam infrastructure in Australia is safe - however our experience on the Burrum River in QLD shows just how easy it is to become a fatality when Dam Infrastructure fails.

Gates constructed in December 2007 at Lenthalls Dam on the heavily impounded Burrum River failed to lower to release flood water as designed in Febuary 2008.
Wide Bay Water was the constructing authority and responsible for the design and operation of the dam gate infrastructure.
Our upstream farm house, where the tributaries join the dam proper was cut of when flood water continued to back up much higher than the constructing authority Wide Bay Water had predicted the water levels would ever go.
Three family members were stuck at our farm house. The emergency evacuation plan found in the Lenthalls Dam Emergency Action Plan called for evacuation after water levels reached RL26.91 - water levels reached 27.4 at the dam wall flowing over the blocked gates and backed up to RL28.5 at our house. No one evacuated the famuily members stranded in rising water.
No one from the constructing authority Wide Bay Water contacted us to undertake evacuation or explain the risk we faced due to Crest Gate Failure.
We believe the CEO Tim Waldron was overseas at conference when the event happed. The Operations manuals for the dam place responsibilty with the CEO as does the action plan. He has not been called to account for his failure to take responsible action to ensure an evacuation would occur in his abscence if required.

If the rain event had not stopped the three people cut off at our flood impacted farm house would have been inundated by metres of water.

We heard about the dam failure from other locals close to the dam wall who had heard the gates have failed - we now have full evidence to verify the dam gate failure.

What our situation highlights is that while most fatalities from failed dams and failed dam infrastructure have occurred in the countries of the south ie third world the west is not imune from dam infrastructure failure.

The capacity of first world dam operators to manage infrastructure/ risk and operational and human failure is not consistent.
We were very lucky the rain event that caused the flooding to back up over the failed dam gate, stopped.
It is however only a matter of time before a dam infrastructure failure in the first world causes fatalities.
We feel that maybe operational and human failures that have occured without fatality have been coverd up and are not generally reported or researched.
It is likely constructing authorities keep these instances quiet.
Please see the small news article that did report the event ( not comprehensively).

See the article:
Resident fears dam gates risk flooding
Posted Wed May 21, 2008 8:26am AEST
Updated Wed May 21, 2008 8:25am AEST
• Map: Hervey Bay 4655
A land-holder upstream of a major dam south-west of Hervey Bay says multi-million dollar barriers on the storage are broken, putting her family at risk of flooding.
Queensland Deputy Premier Paul Lucas will officially open the $16 million project at Lenthalls Dam, which is designed to more than double the storage's capacity.
In what is claimed to be an Australian first, the two metre high crest gates sink when the dam reaches capacity to prevent flooding upstream and provide for environmental flows.
But Esther Allan says in February the gates jammed, causing water to back up onto her property.
"This is an extremely expensive piece of infrastructure. Ratepayers paid for this and their expectation would be that it would be operable," she said.
"If it wasn't, we need to know why - not only because our family's safety was put at risk, but because ratepayers expect to get a result from the infrastructure they pay for."
The local government corporation that runs Lenthalls Dam says the gates do not work, but it was monitoring the rising water.
Wide Bay Water general manager David Wiskar says adjustments were needed during the dam's commissioning and are continuing.
"The gates were all needing some fine-tuning. At the moment we were able to complete that tuning on three of the gates," he said.
"There's two that remain to be done, but we're waiting until the level in the dam falls to an adequate level to [do] those final two."
The Lenthalls Dam Gates are still not fully operational today September 2008 and heading into the QLD summer flood season.

We can evidence what we are saying.
We dont have too much faith that any government authority will maintain our saftey, and our economy is currently healthy and well economically resourced.

Infrastructure once built needs to be operable ongoing through good economic times and bad. Infrastructure needs to be able to operate as designed in all conditions.

Climate Change will continue to place increased pressure on infrastructure in Australia the frequency of extreme storm and weather events will be a counterpoint to extreme drought.

If the infrastructure cannot be managed safely now - those who live in areas affected by damming have much to worry about. Climate change will increase the risks posed by failed infrastructure.

The risks remain for all of those who live on dammed river systems.

The public must be vigiliant and Engineers designers dam operators and those responsible for dam saftey must know that even though there has not recently been a loss of life - the risk is ever present.

In Australia we need transparency in the Emergency Action Plans and better published dam failure flood mapping. For additional information please contact Peter Allen Director Dam Saftey Department of Natural Resources and Water QLD state govt Australia ( they have a web site). Going into the storm season, the matter is still under investigation and upstream residents have not been relocated out of the flood path. The gates still do not work as designed

Active Contributor

Join Date: Apr 2009
Location: Australia
Posts: 18
#3
In reply to #2

Re: Remembering the Vaiont Dam Disaster

06/04/2009 6:40 AM

Yes, you are right Mr/Mrs Guest: dams are damned dangerous and you have much to worry about. By hey, we need water to drink don't we? Sorry to hear you and your family almost drowned. Engineers are not perfect, administrators and legislators aren't either.

Maybe you should have evacuated before the water rose too high?

Cheers,

Frank

__________________
Frankston
3 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Copy to Clipboard

Users who posted comments:

Frankston (1), Guest (1), magwer (1)

  Next in Blog: New Orleans: ‘Til the Levee Breaks
You might be interested in: Line Drivers, Transistors, All Types, Water Control Gates