I think it’s going to take longer than a couple of days to clear out that mess. Maybe they can re-purpose it as aggregate along with boulders and mucho grout somewhere.
Another one of our dams, Fontana - drawings.
It shows an “emergency” spillway, but I am pretty certain that it has never been used.
https://upload.wikimedia.org/wikipedia/commons/5/5b/Fontana-dam-design-tva1.jpg
