Good video. Yeah, there is plenty of debris at the bottom again, but nothing like it was. Still, seeing gray rock is not as positive as it could be, but given the enormous turbulence that takes place as the water tumbles down the ravine, I would expect that it would break off a lot of the looser stuff that is jutting out.
The part of the video at around 4:45 illustrates why I thought that they would build out a hardened ramp from the base of the break-off point sloping downward into the plunge pool. That would allow them to throttle back lower than 40,000 cfs and still not scour up the looser dirt/rock.
If they could find a way to get a steady 10,000-15,000 flow (plus the 11-14000 from the plant) out of the reservoir without using the spillway, that would be great.
Every component of the complex has issues.
The spillways have design/construction issues. The main spillway has operational/maintenance issues.
The dam has operational/maintenance issues at the wet area.
How did water/debris enter the powerhouse? Is there a design deficiency? Or an operational problem?