Evacuations ordered due to Oroville Dam

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Evacuations ordered due to Oroville Dam

Post by TacAir » Sun Feb 12, 2017 8:26 pm

Fearing collapse of emergency spillway at Oroville Dam, Oroville evacuated

The Butte County Sheriff’ Office released the following statement on Facebook:

This is an evacuation order.

Immediate evacuation from the low levels of Oroville and areas downstream is ordered.

A hazardous situation is developing with the Oroville Dam auxiliary spillway. Operation of the auxiliary spillway has lead to severe erosion that could lead to a failure of the structure. Failure of the auxiliary spillway structure will result in an uncontrolled release of flood waters from Lake Oroville. In response to this developing situation, DWR is increasing water releases to 100,000 cubic feet per second.

Immediate evacuation from the low levels of Oroville and areas downstream is ordered.

This in NOT A Drill. This in NOT A Drill.

http://www.sacbee.com/news/state/califo ... rylink=cpy

Didn't see this posted anywhere else.
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Sun Feb 12, 2017 9:31 pm

I just rec'd the word. From the CBC & AP:
Thousands told to flee California town as nearby dam faces emergency spillway failure
Heavy rainfall caused water to flow over emergency spillway at tallest dam in the U.S.
The Associated Press Posted: Feb 12, 2017 8:52 PM ET Last Updated: Feb 12, 2017 8:57 PM ET

Officials have ordered residents near one of the nation's biggest dams in Northern California to evacuate the area, saying a "hazardous situation is developing" after an emergency spillway severely eroded.

The emergency spillway of the Oroville Dam could fail within an hour, unleashing uncontrolled flood waters from Lake Oroville, the California Department of Water Resources said on Sunday afternoon.

People in downstream areas need to leave the area immediately, the department said.

Residents of Oroville, a town of 16,000 people, should head north toward Chico, and other cities should follow orders from their local law enforcement agencies, the Butte County Sheriff's office said.


After heavy rainful, water began flowing over the emergency spillway at the dam on Saturday for the first time in its nearly 50-year history.

Water will continue to flow over an emergency spillway at the nation's tallest dam for another day or so, officials said earlier Sunday.

In addition to the emergency spillway, water also flowed through the main spillway, which was significantly damaged from erosion. Officials said they'll assess the damage starting Monday.

Damage Dam
Water began flowing over the emergency spillway at the Oroville Dam in Northern California on Saturday for the first time in its nearly 50-year history after heavy rainfall. (Rich Pedroncelli/Associated Press)

Unexpected erosion chewed through the main spillway earlier this week, sending chunks of concrete flying and creating a 61-metre-long, 9-metres-deep hole that continues growing.

Engineers don't know what caused the cave-in, but Chris Orrock, a spokesman for the state Department of Water Resources, said it appears the dam's main spillway has stopped crumbling even though it's being used for water releases.

About 240 kilometres northeast of San Francisco, Lake Oroville is one of California's largest man-made lakes, and the 235-metres-tall Oroville Dam is the nation's tallest. The lake is a central piece of California's government-run water delivery network, supplying water for agriculture in the Central Valley and residents and businesses in Southern California.

© The Associated Press, 2017
The Canadian Press
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Re: Evacuations ordered due to Oroville Dam

Post by doitnstyle1 » Sun Feb 12, 2017 10:35 pm

Roads jammed as residents evacuate below endangered dam spillway

http://www.usatoday.com/story/news/2017 ... /97834632/

A little known fact of any metropolitan area in the middle of a crisis. Bugging out now may be a little too late.
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Sun Feb 12, 2017 11:10 pm

BREAKING: At least 130,000 people asked to evacuate over concerns California's Oroville Dam's emergency spillway could fail.
That is a lot of people to move on a no-notice order.
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Re: Evacuations ordered due to Oroville Dam

Post by Anianna » Sun Feb 12, 2017 11:13 pm

That escalated quickly. I don't recall if it was Friday or Saturday, but the news reported they were releasing water into the spillway on purpose to relieve pressure and there was "no risk to residents downstream". I wonder if they actually knew the danger at that point. If they hadn't needed to use the spillway since the dam's construction, I wonder if they just stopped maintaining it thinking they would never need it.
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Sun Feb 12, 2017 11:24 pm

NPR just tweeted: http://www.npr.org/2017/02/12/514903927 ... t=20170212

Can someone tell me how clean up these URLs? Thanks!
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Re: Evacuations ordered due to Oroville Dam

Post by Anianna » Sun Feb 12, 2017 11:31 pm

MPMalloy wrote: NPR just tweeted

Can someone tell me how clean up these URLs? Thanks!
Press quote on this to see. Is that what you're looking for?
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Sun Feb 12, 2017 11:42 pm

I am following this situation closely on Twitter. Apparently, the dam its self is sound. It is the auxiliary/emergency spillway that is failing due to erosion. If the auxiliary/emergency spillway fails, the release of water will be uncontrolled and about 350,000 cubic feet/second. The auxiliary/emergency spillway IS EXPECTED TO FAIL!, providing that the information that I am receiving on Twitter is correct. If anyone can verify any information, please post.

Thank you.

ETA: The dam its self is 20 higher than the auxiliary/emergency spillway. The a/e spillway will go first & than will take pressure off the dam.
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Re: Evacuations ordered due to Oroville Dam

Post by doitnstyle1 » Mon Feb 13, 2017 1:56 am

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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Mon Feb 13, 2017 4:42 am

From Twitter: Evacuation orders now apply to 188,000 people.
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Re: Evacuations ordered due to Oroville Dam

Post by NamelessStain » Mon Feb 13, 2017 7:34 am

If anyone is in the area they are evacuating, please go. Property can be replaced, you can't.

Stay safe people.
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Re: Evacuations ordered due to Oroville Dam

Post by TacAir » Mon Feb 13, 2017 11:21 am

https://weather.com/weather/tenday/l/Or ... 95966:4:US

More rain in forecast - for several days no less.
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Re: Evacuations ordered due to Oroville Dam

Post by teotwaki » Mon Feb 13, 2017 11:22 am

Image

When the dam became too full they started dumping water over the permanent concrete spillway. It suffered severe erosion as seen in this photo.

Image

The damage to the concrete spillway has forced the release of water over the emergency spillway and into the earthen embankment.

"Officials feared a failure of the emergency spillway would lead to huge amounts of water to hit the Feather River and other waterways. The increase of water could result in flooding and levee failures miles south of the dam."

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Re: Evacuations ordered due to Oroville Dam

Post by teotwaki » Mon Feb 13, 2017 11:24 am



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Re: Evacuations ordered due to Oroville Dam

Post by TacAir » Mon Feb 13, 2017 1:26 pm

Click to see image
http://i.imgur.com/bY5ydpY.jpg

FYI - the dam isn't the issue -- hillside erosion of the emergency spillway is...
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Mon Feb 13, 2017 3:29 pm

From Reuters via Twitter:
JUST IN: Evacuation near California's Oroville Dam still in effect, but officials working on plan to allow citizens back home: sheriff
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Re: Evacuations ordered due to Oroville Dam

Post by teotwaki » Mon Feb 13, 2017 3:48 pm

MPMalloy wrote:From Reuters via Twitter:
JUST IN: Evacuation near California's Oroville Dam still in effect, but officials working on plan to allow citizens back home: sheriff

Apparently the water level has dropped significantly and they plan to release as much water as possible before the next series of storms roll in
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Mon Feb 13, 2017 3:49 pm

teotwaki wrote:
MPMalloy wrote:From Reuters via Twitter:
JUST IN: Evacuation near California's Oroville Dam still in effect, but officials working on plan to allow citizens back home: sheriff
Apparently the water level has dropped significantly and they plan to release as much water as possible before the next series of storms roll in
Sounds like more that just a good idea.
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Re: Evacuations ordered due to Oroville Dam

Post by Anianna » Mon Feb 13, 2017 4:52 pm

They thought there was no danger to the downstream population Friday and Saturday, then said "oh shit" on Sunday, and now they think they can make it safe enough for people to come home despite incoming storms? Sounds like a bunch of ambulant poultry are running this shindig. :?
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Re: Evacuations ordered due to Oroville Dam

Post by MPMalloy » Mon Feb 13, 2017 5:30 pm

Anianna wrote:They thought there was no danger to the downstream population Friday and Saturday, then said "oh shit" on Sunday, and now they think they can make it safe enough for people to come home despite incoming storms? Sounds like a bunch of ambulant poultry are running this shindig. :?
Yup.
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Re: Evacuations ordered due to Oroville Dam

Post by TacAir » Mon Feb 13, 2017 6:38 pm

MPMalloy wrote:
Anianna wrote:They thought there was no danger to the downstream population Friday and Saturday, then said "oh shit" on Sunday, and now they think they can make it safe enough for people to come home despite incoming storms? Sounds like a bunch of ambulant poultry are running this shindig. :?
Yup.
Saw something like this in the RK Riots. Politics vs engineers (professionals)

"You forced me to leave home because (something the State did). Lost time at work, kids missed skool, ya da yada yada. I'M Gonna SUE!!!!!!

Politicians seem to be less worried about possible loss of life vs losing a major or class-action lawsuit.

Bah!
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Re: Evacuations ordered due to Oroville Dam

Post by Evan the Diplomat » Mon Feb 13, 2017 10:17 pm

I will not be second-guessing the engineers from across the country. However, this is an excellent opportunity to reviews the fundamentals of preparedness.

I wonder how many people put the possibility of a dam failure or flood in their risk matrix.

This kind of situation speaks to the fundamentals of Zombie Squad. A prepared bag, prepared food to take, no MREs required. Important documents already scanned and uploaded to the cloud or stored on a thumb drive. Cash on hand and a 3/4 tank of gas. A plan for their pets or livestock. How many people had a planned destination and multiple routes to get there. Did they find hotels or friends or relatives outside of the valley that they could go to.

I guess the point I'm trying to make, and I'm preaching to the choir here, is that so many new members come on board introduce themselves, their arsenal, or asked for recommendations on what type of firearm to buy. I'm not against any weapons for hunting or self-defense but this is a classic case of low-cost, low-tech preparations being the most effective.
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Re: Evacuations ordered due to Oroville Dam

Post by teotwaki » Tue Feb 14, 2017 9:28 am

Tuesday February 14

6am PST update: All Butte County schools, except for Chico Unified and Paradise Unified school districts, will remain closed through Friday February 17.

Butte Education Office says the schools will remain closed due to the “mandatory evacuation and the uncertain timeframe for the return of evacuees”.

Yuba and Sutter County schools are also closed today (February 14), except for Camptonville, because evacuation orders remain in place.

5.45am PST update - The Salvation Army Sata Rosa Corp said volunteers are helping to prepare breakfast for evacuees after another night in the shelters.

3am PST update: The flash flood warning for the "potential failure" of the emergency spillway will remain in place until 4.15pm PST on Tuesday.

The National Weather Service in Sacramento warned: "The situation remains potentially dangerous and local evacuation orders have not been lifted."

It said that water is no longer flowing over the emergency spillway but dam operators are releasing water out of the dam to lower lake levels.

12am PST update: Butte County has confirmed that evacuees have to spend another night in shelters and cannot go home yet as dam engineers work to fix the spillway.

It said: “County offices in Oroville, Gridley and Biggs are closed on Tuesday, February 14th, due to the Immediate Evacuation Order in place.”

Work to repair the spillway has slowed overnight after helicopters and trucks brought in rocks and slurry to fix the hole in the damaged spillway yesterday.

DWR spokesman Chris Orrock said: “You're putting rocks in a hole. Then you're putting slurry in to solidify it. When water comes down, it will hit that patch and roll off."
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Re: Evacuations ordered due to Oroville Dam

Post by teotwaki » Tue Feb 14, 2017 9:33 am

Evan the Diplomat wrote:---------
I wonder how many people put the possibility of a dam failure or flood in their risk matrix.-----------
I did! I did! :mrgreen:

Page 3 of my thread on gathering intel about my local area does include examining a large dam not too far from me

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