Geeez, more flooding concerns. I was just wondering how the levees were holding up.
[size=83]Event: Flash Flood Watch
Alert: ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING...
The Flash Flood Watch continues for
A portion of northern California…including the following area…Carquinez Strait and Delta.
Through Saturday morning
River levels in the delta continue to be elevated due to in
coming flood flows and reservoir releases from upstream rivers.
The flood flows from Don Pedro Reservior are expected to be
arriving in the south Delta Wednesday evening.
Previously identified concern areas on local levees will see
increased river levels over the next week. As a precaution,
San Joaquin County officials and the National Weather Service
are encouraging local residents to be prepared to take action
in the event that levee conditions were to deteriorate.
[/size]
[size=83]Event: Flash Flood Watch
Alert: ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY MORNING FOR THE
LEVEES ALONG THE LOWER SAN JOAQUIN RIVER AND IN THE DELTA OF
NORTHWESTERN STANISLAUS AND SOUTHERN SAN JOAUQIN COUNTIES...
The National Weather Service in Sacramento has expanded the
Flash Flood Watch to include a portion of northern
California…including the following area…Northern San
Joaquin Valley.
Through Saturday morning
Don Pedro and other local dams are making large reservoir
releases that are raising river levels along the Lower San
Joaquin River north of Grayson. These elevated levels are
causing flooding in the low lying bottom areas along the river
and increasing concerns on the levees of the area.
We can see now how it was put together, definitely no rebar, just a bunch slabs put together and they thought that would take care of it. I heard a price tag of $700 million just to rebuild it.
Yeah, pitiful, even driveways have rebar :roll: The amount of rubble in the river in the second video is impressive, it’s no wonder they can’t run the power plant with all that blocking the outflow.
Agreed, they’ve must have emptied out every heavy equipment rental yard on the west coast. Good to see that can come up with a disaster response like that in earthquake country
Oroville is asking for disaster $ to repair the roads leading to the dam that have been torn up by all the trucks.
Buildquality, any? :lol:
Those slabs looks quite thin for that purpose.
Seems you have quite bad quality rock too if it gets like that just from some water…
True! Back in 2005(?) when the Sierra club etc. were making a fuss about the emergency spillway the Water admin claimed it was on solid bedrock, but as you’ve observed it’s actually “schist” which fragments very easily. There’s speculation that the breakdown of the concrete was hastened by cavitation, apparently other spillways are designed to minimize that - but not this one.
Saw a report this morning that the rapid fall of the river level, from shutting down the output from the dam, is causing river banks to collapse down stream. The fun never ends…
A quick update for those who followed the Oroville Dam spillway collapse in this thread earlier this year.
Our guesses about the failure have been confirmed in several expert analyses, concrete was too thin, no re-bar (there were short dowels of rebar between the slabs but that’s all). What we didn’t know is that the concrete was poured on a foundation of fragmented rock and worse so once water started passing under it, from the side or through cracks, the thin concrete lost support and failure was inevitable.
The repair work is underway now. All the old concrete is out, much of it blown up (boys will have their fun ). They are cleaning up rock and debris, and pumping concrete in where necessary to form a solid new foundation. This Sacramento Bee page has several videos.
The repair contract with Kiewit is for $275 million over two years (expect the final cost to be higher with incentives and changes etc.), and the total including the emergency fixes will be well over $500 million. The state is hoping that the feds will pick up a large part of the cost :-"
So proof once again that a government entity either got hosed by the original contractor, or they agreed to built it “just good enough” like so many government projects. Then it bites the tax payers on the azz years down the road.
Heaven forbid do it right the first time.