The rock dump is for the ‘mud’ emergency spillway? Not for the 300 foot hole washed out on the main spillway? The video/pictures I have seen appears a mountain of rock/ cement will be required to fill in both spillways? Doesn’t this span over 700 feet up from the base?
I think the “rock dump” is for the emergency spillway, to fill in the gulleys and channels just below the spillway rim. I don’t think they are attending to the main spillway at this time, and are content if it remains stable.
Not sure about “700 feet”. The emergency spillway is 1700 feet long, laterally, and maybe that’s what you refer to. The “height”, by some measure, of the dam is 900 feet, so maybe the main spillway “hole” is 700 feet below the spillway rim. Obviously, I’m not sure where that figure comes from.
I blame the “news” for being mindless in these matters. They just spew out statements of all kinds which seem to be stamped with a confused history of acquistion. “All news is fake news.”