Oroville Spillways Phase 2 Update Mid-June 2018

YouTube description:

Crews lay roller-compacted concrete (RCC) for the emergency spillway splashpad, completing the northern half of its construction. Meanwhile, workers spray compressed air and water to clean the rock foundation of the upper chute to prepare for structural concrete, while crews continue installing slab anchors in the RCC on the middle chute.
RFlaggsays...

So what if they need to use either spillway before they finish this project? It looks like even the main spillway is a long ways from being complete. While the emergency spillway can probably hold off except for another emergency of course...

I'd imagine if I lived downstream I'd be thinking, a little too late on these repairs, given they were requested a decade ago.

eric3579says...

If you have been following it as i have, you would know the spillway was temporarily finished and usable in Nov, 2017 if need be. This video back from Nov 2017 well explains what's going on, and should answer all your questions. https://youtu.be/pW0y_wkrCwM. If you watch the DWR or blancolirio videos on the spillway you will see it was all planned out and executed amazingly well.

blancolirio: Orville spillway videos https://www.youtube.com/playlist?list=PL6SYmp3qb3uMCqXIp7mYmiAPeEVoazpUE

DWR Orville videos https://www.youtube.com/playlist?list=PLeod6x87Tu6eVFnSyEtQeOVbxvSWywPlx

RFlaggsaid:

So what if they need to use either spillway before they finish this project? It looks like even the main spillway is a long ways from being complete. While the emergency spillway can probably hold off except for another emergency of course...

I'd imagine if I lived downstream I'd be thinking, a little too late on these repairs, given they were requested a decade ago.

oritteroposays...

To add to @eric3579's comment, the work was fairly carefully planned to occur over Summer, and after the water level had been reduced, to minimise the chances that they would get caught out like that. The hydro plant should be able to release more water than required for the duration of the second phase of works.

Their first phase was designed to leave the main spillway usable over winter, so this second phase could commence afterwards. The emergency spillway was designed never to be used, it was more like a fuse to allow evacuation if the dam fails. The revised design, taking into account the fact that the emergency spillway was required, appears to have strengthened it enough to be used as a backup instead.

The repairs would have been a heck of a lot cheaper if they had been conducted a decade ago, although I do wonder if all the flaws would have been obvious at the time.

RFlaggsaid:

So what if they need to use either spillway before they finish this project? It looks like even the main spillway is a long ways from being complete. While the emergency spillway can probably hold off except for another emergency of course...

I'd imagine if I lived downstream I'd be thinking, a little too late on these repairs, given they were requested a decade ago.

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