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rick sumner
Trad climber
reno, nevada/ wasilla alaska
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Feb 13, 2017 - 04:56pm PT
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Right Tami, but if they had a series of dams (well designed, we'll built, we'll maintained) up the Feather River it would reduce the chance of over capacity and failure. Not to mention renewable energy and water storage for thirsty residents.
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Gary
Social climber
Desolation Basin, Calif.
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Feb 13, 2017 - 05:41pm PT
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Anyone know why they aren't letting people return home?
Maybe we learned something from the St. Francis Dam?
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WBraun
climber
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Feb 13, 2017 - 05:56pm PT
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Whoa !!!!
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Caveman
climber
Cumberland Plateau
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Feb 13, 2017 - 06:05pm PT
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Can't be good! That is one big pile of fill! Surely there is some rock in it?
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ladyscarlett
Trad climber
SF Bay Area, California
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Feb 13, 2017 - 06:30pm PT
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The damage if an earthquake hit sometime in the next week to 10 days would be huge.
The current batch of newb Kali transplants haven't seen a solid act of California water nature in a bit. Might do 'em good to see the meaning of the Real California Obsession.
Like DMT, it cracks me up that So cal is more aware of this situation than SF, because...water is life.
Cheers
LS
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Charlie D.
Trad climber
Western Slope, Tahoe Sierra
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Feb 13, 2017 - 06:32pm PT
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The water coming out of the power plant race is muddy and has been for a couple of days.
Interesting observation, DMT you know why? Maybe the power plant is releasing more water than ever and eroding the old river channel???
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John M
climber
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Feb 13, 2017 - 06:44pm PT
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Edit: DMT was posting as I was looking for this article.
The hydroelectric plant is closed. There is no water flowing through it as far as I understand. So that muddy water could just be water from the main spillway that is filling back up river because there is so much volume.
https://ww2.kqed.org/news/2017/02/07/engineers-assess-spillway-problem-at-oroville-dam/
One of the biggest challenges engineers and work crews face is how to clear the Thermalito Diversion Pool immediately below the wrecked spillway of a large volume of concrete debris and sediment that have dammed the waterway and forced closure of the hydroelectric plant at the base of Oroville Dam.
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rockermike
Trad climber
Berkeley
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Feb 13, 2017 - 06:44pm PT
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I read / heard they closed down the generator pipes to protect equipment from damage. Which means even more water has to pass over the top.
(Ops: my internet is on slow... someone else already mentioned...)
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Edge
Trad climber
Betwixt and Between Nederland & Boulder, CO
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Feb 13, 2017 - 06:45pm PT
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If the power plant is off line, is the flow of water under the dam also shut down? Then wouldn't the backwash of muddy sediment from the main spillway migrate to the base of the dam?
Just guessing (with much concern) from the safety of 8100'.
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Charlie D.
Trad climber
Western Slope, Tahoe Sierra
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Feb 13, 2017 - 06:54pm PT
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Why would it be muddy?
I had heard a part of the release strategy is the power house which is maxing out on its release.
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Reilly
Mountain climber
The Other Monrovia- CA
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Feb 13, 2017 - 07:52pm PT
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There's nothing dumber than a news outlet
Boy, howdy! Saw CNN's correspondent tonight report on the
"100,000 cubic square inches of water."
You can't make that sh!t up! Dude needs to go back and get his GED. Woot!
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healyje
Trad climber
Portland, Oregon
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Feb 13, 2017 - 08:01pm PT
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The muddy water is sediment from the erosion of the spillway.
This. When the spillway water and sediments hit the river it's pressure and head are pushing the water in both directions - downriver and upriver towards the dam. So long as they're running high flows over the spillway there will be a back pressure towards the dam. If they are running the turbines then the turbine effluent is coming out below the brown sediment-laden water and mixing with the sediment load fast enough to not see any clear water (but in the picture it doesn't look like they are running water through the turbines).
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Kalimon
Social climber
Ridgway, CO
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Feb 13, 2017 - 08:56pm PT
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Is the main spillway down to bedrock yet? Is there any bedrock below the emergency spillway?
Great image DMT.
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healyje
Trad climber
Portland, Oregon
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Feb 13, 2017 - 09:15pm PT
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Is the main spillway down to bedrock yet? Is there any bedrock below the emergency spillway?
Doesn't look like it or it has a ways to go yet.
A bad situation all the way around as they try to stay ahead of the next couple of months' rain. If they get behind at any point then they'll be overtopping the auxiliary spillway again. Going to be an expensive affair putting humpty-dumpty back together again no matter what.
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BLUEBLOCR
Social climber
joshua tree
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Feb 13, 2017 - 09:18pm PT
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Obliviously this is one of Browns manuvers.
That bullet train rehersal would'a fix this sh#t.
Happie sez he needs to get a multimeter😀
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tuolumne_tradster
Trad climber
Leading Edge of North American Plate
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Feb 13, 2017 - 10:32pm PT
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Is the main spillway down to bedrock yet? Is there any bedrock below the emergency spillway?
Here are some closeup photos that show the bedrock beneath the spillway which is Jurassic age greenschist facies meta volcanic rocks of the Smartville Ophiolite complex. Note that the dam is not located on relatively solid granitic rocks but heterogenous, highly fractured and sheared metamorphic rocks similar to the rock units of Mt Dana. This complex fracture network represents planes of weakness along which the bedrock is susceptible to erosion and possibly catastrophic failure.
More info can be found on this blogsite...
https://www.metabunk.org/oroville-dam-spillway-failure.t8381/page-10
Here is the geologic map of the Oroville Dam area...
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Reilly
Mountain climber
The Other Monrovia- CA
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Feb 13, 2017 - 10:40pm PT
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Wait, they didn't put any rebar in that concrete? Was the low bidder from Egypt?
It also shows evidence of not being a continuous pour. WTF?
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john hansen
climber
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Feb 13, 2017 - 10:45pm PT
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It is really surprising that there is no re bar.
EDIT
I see the rebar now,.
Water is incredibly powerful.
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Brandon-
climber
The Granite State.
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Feb 13, 2017 - 10:49pm PT
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In the photo above you can clearly see rebar.
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healyje
Trad climber
Portland, Oregon
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Feb 13, 2017 - 10:52pm PT
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Looks like there's rebar to me, but obviously not enough of it. It's also surprising that they didn't take the entire spillway path down to bedrock and then build it back up. Given that they just poured over earth to the right of that bedrock, you'd have thought they would have at least sunk piers down to bedrock under the siderails.
Maybe it should have been built more like a bridge with side piers to bedrock and connecting beams spanning between the piers under the spillway. Pretty much cutting corners no matter how you look at it.
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