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another good, and current, resource https://blogs.agu.org/landslideblog/

The Ituango Dam in Colombia, still under construction, seems in imminent danger of collapse, possible affecting hundreds of thousands of people. https://en.wikipedia.org/wiki/Ituango_Dam Previous to the incident, there were three tunnels with the purpose of rerouting the Cauca river's flow...

I find it at http://www.water.ca.gov/oroville-spillway/pdf/2017/BOC_memo4.pdf linked from http://www.water.ca.gov/oroville-spillway/bocreports2.cfm

That explains the delay. Thanks for the summarization!

I too have been tracking the spillway here since very early on, and agree that part of the referenced document are familiar. One image however which I do not recall from here (doesn't mean it isn't here) is this one. indicating structural layers and the probability of water beneath the slab...

Extensive photo documentation (annotated) of FCS in this document by retired UC Berkeley civil engineering professor, R.G. Bea, published by latimes. http://documents.latimes.com/report-finds-serious-design-construction-and-maintenance-defects-oroville-dam-emergency-spillway/

Not that it's a wrong thing to do, but they sure are spending a lot of expense and effort to shore up an emergency spillway which they are determined to never use. It feels like their investigations haven't increased confidence in the original weir stability.

Anchors, which DO require surface exposure, explained in video after 17min. Source: https://www.youtube.com/watch?v=c16dr9qzlZY

Yes, I saw the briefing. Note also that they went to quite a bit of effort to seal every crack they could find in the upper spillway, and it would be relatively trivial to bolt at least flush (not sure of the bolting detail), and patch, unless perchance there is an intent to grab and remove the...

Anchors (which would not require surface exposure) or sub-surface Instrumentation (which would likely require surface access) ??? Source: mng-chico.smugmug.com/Spillway-gates-open-3-17-2017/i-GtZHn66/O (a healthy repository of additional photos this day)

Work in this area beneath the emergency weir nearest to the FCS hasn't been publicly shared in a long time. Here's an aerial image, snipped from a large composite which runs all the way down the FSC. Additional new aerial coverage at youtube.com/watch?v=qIwzJ0Dnz9E&t=613s provides very good...

Slope of the spillway should be a matter of record; and applicable to the top of the sidewall, to preclude the need to estimate the horizontal in post#180.

pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/I0000Ug.1nsIk42E/KG-oroville-repair-16624-jpg Looks to me as a drilling or coring operation.

Wow. Twice a day! modelling at CDWR per www.water.ca.gov/news/newsreleases/2017/030817_dwr_news_release2.pdf Lake level may increase to a forecasted level of 865 feet during this period. This forecasted lake level is based on twice-a-day modeling that considers lake inflows and Hyatt Powerplant...

Here are the new numbers for March: cdec.water.ca.gov/cgi-progs/iodir?s=b120 Oct Water 80% WY thru Feb Mar Apr May Jun Jul Aug Sep Year Probability % Jan Range Avg Feather, Oroville 2756 2920 1025 1030 1035 540 225 130 114...

or to secure additional scaffolding, or other process infrastructure.

also showing yellow iron on the pile. Source: www.youtube.com/watch?v=E3gtNUljcN0 We'll see if they store it on site for reconstruction fill.

For those of us looking at inflow projections, CDWR publishes a monthly long term outlook, from which the 1 February report (issued on the 8th?) shows the following, inserted here now so that we can also compare it to the forthcoming March outlook. [or the actual Feb inflows, if somebody wants...

KCRA filming the flow reduction live on 2/27: https://www.facebook.com/KCRA3/videos/10155073025346514/ Slower flows kicking up a lot more sediment at the first plunge pool. Infuriating that they waste so much time on the gate area. At around 38m; another at 58m; good close-up footage of...

That IS the easiest and most direct and most precise way possible :) No complexity whatsoever. Flow rates are more complicated.