Oroville Spillway is failing with enough rain dam may break - Page 2 - Mountain Buzz
 

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Old 02-10-2017   #11
 
cedar city, Utah
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Some of the photos emerging from the last 36 hours are just frightening. Such a rapid increase in erosion.
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Old 02-11-2017   #12
Misspellingintothefuture!
 
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Tabernash, Colorado
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Oh Wow!!
"When trying to control the most powerful force on the planet goes wrong"?!?!?
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Old 02-12-2017   #13
 
Golden, Colorado
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Quote:
Originally Posted by restrac2000 View Post
Why are spillways so prone to this sort of damage? Isn't their primary purpose to be used in moments like this, ie shouldn't design incorporate these types of forces? Or are they assumed to perform well enough and repairs just assumed to be part and parcel?
Cavitation is a likely cause for these types of failures. A lot of these large dams were designed and constructed back in the 1950s or 60s or earlier, before engineers had a good understanding of cavitation and how to prevent it. Spillways can probably be retrofitted to prevent this, but it requires some infrastructure spending. Spending on such infrastructure has largely dwindled since these dams were built. For what money is spent on dam upgrades, my guess is that the Army Corps and other agencies that manage dams prioritize their projects based on risk. Overall, Army Corps is addressing some serious risks (e.g. seismic, flood, stability, etc.) at other dams and I don't know where spillways fall in the priority list.
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Old 02-12-2017   #14
 
Alberta, Alberta
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Evacuation order issued

Just reading on the CBC (Canadian) website that an evacuation order has been issued downstream of the Oroville due to believed imminent failure of the spillway. Stay safe folks if your in the area.
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Old 02-12-2017   #15
 
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Lakewood, Colorado
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They are saying the Emergency spillway is on the brink of failing. Its not the main one shown in the pictures above. The report I read says they are gonna put more water down the main spillway so that less goes down the emergency one but its still pretty tenuous. Damage to the main spillway is still a worry and with more water will be accelerated.

It will be interesting to see what happens with it. I'm glad they are evacuating so that less people are at risk if/when it fails.
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Old 02-12-2017   #16
over the horizon
 
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Carbondale, Colorado
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Here's some local news for a live feed:




This is gut wrenching.
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Old 02-12-2017   #17
over the horizon
 
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Carbondale, Colorado
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Another news link:

Watch KCRA Nowcast Newscasts Live and On Demand
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Old 02-13-2017   #18
 
cedar city, Utah
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I hope any MB folks in the area are safe. Its tough to know how timely the news alerts remain but it sounds like the evacuation orders are creating some chaos.

They are saying 100,000 cfs is going down the main spillway. Sounds like they are trying to shore up the breaches on the emergency spillway.

Sounds absolutely frightening.

Phillip
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Old 02-13-2017   #19
 
Conejos Canyon & Houston, CO & TX
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they should have just put up plywood like at glen canyon in '83...
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Old 02-13-2017   #20
 
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Hi,

It does look like they could have gone to school on Glen Canyon '83 when it comes to learning how to retrofit a smooth concrete surface to resist cavitation.

FWIW.

Rich Phillips
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