I stay on top of this story quite a bit.It's easily one of the biggest engineering and construction jobs in the country@ the moment.
months ago I was highly critical of the continued use of the main spillway. I wanted to see it scrapped and replaced with modern tech ( vs 1960's)
in this recent video you can see the current progress including the drainage system upgrades and the use of several types of concrete being used. it's 20 minutes but I love this sort of thing
https://www.youtube.com/watch?v=537ZMvix1Pg
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