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RegGuheert
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Oroville Dam Spillway Damage

Sun Feb 12, 2017 7:32 pm

Officials are evacuating below the Oroville dam because the first use of the emergency spillway in the life of the dam (it is over 50 years old) has lead to excessive erosion and the possibility of imminent failure.
RegGuheert
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RegGuheert
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 4:06 am

RegGuheert wrote:Officials are evacuating below the Oroville dam because the first use of the emergency spillway in the life of the dam (it is over 50 years old) has lead to excessive erosion and the possibility of imminent failure.
188,000 residents were evacuated overnight. Fortunately, the level of the lake has been reduced below the lip of the emergency spillway. Officials are hoping to drop the level of the lake by 50 feet in order to prepare for the weather coming later this week.
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RegGuheert
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 5:48 am

It appears that the civil engineers responsible for maintenance at the Oroville Dam were not able to properly identify the catastrophic condition of the main spillway when they inspected/repaired problems with it in 2013:
The Sacramento Bee wrote:“There wasn’t any evidence that anything more needed to be done,” said Dossey, “repairs were smooth and looked like they were good and secure.”
It seems CA needs to hire civil engineers who can tell the difference between a catastrophically-damaged spillway and one which will work as designed.
RegGuheert
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lorenfb
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 9:49 am

RegGuheert wrote:It appears that the civil engineers responsible for maintenance at the Oroville Dam were not able to properly identify the catastrophic condition of the main spillway when they inspected/repaired problems with it in 2013:
The Sacramento Bee wrote:“There wasn’t any evidence that anything more needed to be done,” said Dossey, “repairs were smooth and looked like they were good and secure.”
It seems CA needs to hire civil engineers who can tell the difference between a catastrophically-damaged spillway and one which will work as designed.


And you'd have thought that this state, given the periodic droughts, would've provisioned for a rainy season
like this year, e.g. all that wasted water. Bring on the future CA droughts and water rationing! But again, can CA
really expect more from whom it elects.

downeykp
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 10:07 am

lorenfb wrote:
RegGuheert wrote:It appears that the civil engineers responsible for maintenance at the Oroville Dam were not able to properly identify the catastrophic condition of the main spillway when they inspected/repaired problems with it in 2013:
The Sacramento Bee wrote:“There wasn’t any evidence that anything more needed to be done,” said Dossey, “repairs were smooth and looked like they were good and secure.”
It seems CA needs to hire civil engineers who can tell the difference between a catastrophically-damaged spillway and one which will work as designed.


And you'd have thought that this state, given the periodic droughts, would've provisioned for a rainy season
like this year, e.g. all that wasted water. Bring on the future CA droughts and water rationing! But again, can CA
really expect more from whom it elects.


Oh and your perfect. How does one plan for biblical floods? These rains are unprecedented. People in CA have been trying to expand the reservoir system for years, but no one wanted to pay for it. There are many proposals including raising some dams like Shasta, but again money always seems to get in the way.
The Governator did nothing to make this situation better and from your comment above he was on your team.
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philip
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 5:02 pm

downeykp wrote:People in CA have been trying to expand the reservoir system for years, but no one wanted to pay for it. There are many proposals including raising some dams like Shasta, but again money always seems to get in the way. .


Nope, 2.7 billion was approved for water projects, and raising Shasta dam was one of the proposed projects.

Apparently raising this dam would cause too much of an impact to endangered Salmon and the U.S. Fish and Wildlife Service did not like the mitigation that was proposed.
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edatoakrun
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 5:21 pm

Best news coverage is from the Sac Bee..

Check out the inundation map, showing the Sutter buttes potential as an island, here:

http://www.sacbee.com/news/state/califo ... 05739.html


downeykp wrote:... How does one plan for biblical floods? These rains are unprecedented...

Actually, not an extraordinarily wet winter, yet.

If we have severe storms in the Feather watershed over the next few months, it will take a lot of luck to avoid major flooding over a huge area of the Sacramento Valley.

="downeykp"...People in CA have been trying to expand the reservoir system for years, but no one wanted to pay for it. There are many proposals including raising some dams like Shasta...

The real tragedy is that billions (?) of dollars of economic losses could probably have been avoided by some fairly cheap engineering, planning, and maintenance.

An emergency spillway design that failed within hours of its first use?
no condition is permanent

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Marktm
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Re: Oroville Dam Spillway Damage

Mon Feb 13, 2017 6:12 pm

Had an analogous failure in Texas in a major CORP OF ENGINEER'S lake. The overflow spillway was severely eroded and formed a new mini Grand Canyon for miles! This exposed really nice archaeological structures - the state is making money with tours in the canyon. Man is no match for catastrophic natural events.
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jhm614
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Re: Oroville Dam Spillway Damage

Mon Feb 13, 2017 6:34 pm

Marktm wrote:Had an analogous failure in Texas in a major CORP OF ENGINEER'S lake. The overflow spillway was severely eroded and formed a new mini Grand Canyon for miles! This exposed really nice archaeological structures - the state is making money with tours in the canyon. Man is no match for catastrophic natural events.

Interesting! When and where did this happen?
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edatoakrun
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Re: Western USA drought worst in modern era

Mon Feb 13, 2017 7:10 pm

edatoakrun wrote:Best news coverage is from the Sac Bee..

An emergency spillway design that failed within hours of its first use?

Engineers have known for decades that Oroville’s backup spillway was unreliable

...In 2003 through 2005, three environmental groups – Friends of the River, the South Yuba Citizens League and the Sierra Club – urged the federal government to require the lining of the auxiliary spillway as part of the dam’s licensing process.

“At present, the ungated spillway at Oroville Dam consists of a spillway lip only – and utilizes a hillside as the project spillway,” the groups wrote in 2003 to the Federal Energy Regulatory Commission. “Utilizing such a spillway has the potential to cause severe damage to the downstream hillside, project facilities and downstream environments located in the path of the flood release.”

Despite such concerns, FERC ultimately decided not to require lining of the spillway, as the San Jose Mercury News reported Sunday. A senior engineer told his manager that it would take a “rare event” to utilize the emergency spillway and that using it “would not affect reservoir control or endanger the dam.”

Late last week, engineers discovered a gaping hole in the concrete of Oroville’s main spillway, following heavy releases from the reservoir. To stem the damage, they reduced flows going down the spillway, allowing the reservoir level to rise and spill over the auxiliary spillway for the first time in the dam’s 48-year history.

The result was severe erosion at the base of the spillway, along with “severe damage to the downstream hillside” – just as the three environmental groups had predicted...

Oroville provides water to the State Water Contractors, which includes the powerful Metropolitan Water District of Southern California, as well as water districts in Silicon Valley and Kern County. Documents from 2006 show that lawyers for the State Water Contractors downplayed the risk of the unlined spillway, and argued that relicensing was the wrong forum to address such issues...

http://www.sacbee.com/latest-news/article132528514.html
no condition is permanent

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