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Old 02-15-2007, 12:10 PM   #32
xoxoxoBruce
The future is unwritten
 
Join Date: Oct 2002
Posts: 62,967
Quote:
Originally Posted by Elspode View Post
I guess the spillway shaft itself is just a tunnel drilled through solid rock? I'd like to the see profile of that...I mean, it has 770' of drop, and has to make a bend from vertical to horizontal at some point. The water pressure at that bend must be tres' impressivo.
Pretty sure it's concrete all the way, constructed integral with the dam. Hoover/Boulder Dam, however, uses bypass tunnels through the rock that are fed by a spillway channel. I've seen that setup and those tunnels must be 50 feet in diameter.
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