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Wow. I suspect that road will need some work after they are done... I hope we don't have to start another thread.... (my golf course opens tomorrow in Surrey BC) :)

Another facebook live stream was recorded today. Some good shots of the debris island and of the gorge. See screenshot and link. I know I need to get my eyeglass prescription checked, but that gorge is looking pretty deep to me, and the debris has to be coming from somewhere. **cleaned up...

No I don't disagree with what you are saying. However, for emphasis, there is pressure on the drain pipes (backpressure / friction loss causing visible jets at the operating drain discharges), and if the drains go thru voids, or get broken creating voids, they can empty into the voids, and...

Just listening to the recording, and one thing was not clear. They plan on going dry in the main spillway for a period of time, and currently the powerplant is not passing water. Do they have a bypass tunnel/channel somewhere to prevent the river drying up? Or will they maintain a small flow...

Thanks! I wonder what the river level is at the powerhouse is today? A few days back I saw a post indicating that they had 8' of freeboard, before "flooding" the powerhouse (whatever that means). The debris island certainly appears to be larger than that we saw three days ago, but I recognize...

Thanks. Those are good photos. Agreed the ridge is holding at the road. But, unless my eyes are playing tricks with me, it looks like the gorge is now much deeper in the areas annotated green and further downstream. The photo on the right shows much more flow, yet more rock is exposed to the...

Thanks Sean. I agree that the water in the gorge doesn't appear to be carrying much sediment today (perhaps we are down to stable bedrock?). I wonder what the flow is in the spillway? I am a bit puzzled though on the extent of the erosion on the gorge (right hand fan). To me, the gorge likely...

So were the drains vitrified clay right up to the discharge on the wall? If so, it takes corrosion out of the equation, but it allows flow, both into and out of the drainage system. It is difficult to ensure integrity for obvious reasons (brittle, joints,etc) . If a drain is pressurized, the...

I didn't listen to the press conference, but I suspect they call it "low flow" because the design flow thru the power station is much lower than that over the spillways. I don't have the number handy. They want to clear a trench to bypass the debris and drain the pool, but as you allude to...

Thanks Sean. My "techie" days have long since passed...

Thanks for this. The new low flow channel makes sense, although it might be difficult to implement if the debris comes in faster than they can dig it out. Also ramping the main spillway back up to "exceed" 100,000 cfs could prove interesting. This animal is not the same animal it was a few...

I don't think the live feed is "live" anymore. It seems to be just replaying what was "live" earlier.

Thanks for your response and for the video. Looking again at the live facebook feed, the left hand deck is almost gone adjacent to the "hole" at the bottom of the chute. Effectively, as far as directing flow, the deck is already gone. To me it will take an extremely large flow to ever really...

I have annotated a photo showing the "nose" that I was referring to.

Thanks for the link Anna. I noticed something on the live video that I hadn't seen or appreciated before in the static pictures. There is a large "nose" in the cliffs on the right stream that is currently taking a real pounding. This could be an area that breaks off, unless there is a lot of...

Thanks. I agree, not really relevant to the integrity of the spillways (lower portions) and to the dam, but more debris in the river (worst known case is bounded by the new left hand side ravine discovered a few days ago) means more risk of flooding the power plant.

Thanks for your response. I think the tail end of the spillway is now trying to put the brakes on the straight downstream path, and encouraging diversion right (more than before). See the attached photo with green annotations (I am getting better at this!). The slab is lifting on the exposed...

Agreed. But does this mean that when they ramp up the spillway flow again, that the majority of the flow will now take the right hand channel, bringing new conditions to the ravine and to the cliff? It seems today's path of least resistance is different permanently than what is was before...

try this (breathes a huge sigh of relief...)....

I'm having trouble annotating the photo, but will keep on trying (senior moment(s)). In the interim, let me try and paraphrase. It appears to me, and my eyes might just be playing games (different location than previous photos, etc), that the right side ravine that is carrying most of the flow...