February 14, 2007: Big-ass drain hole

Elspode · 02-15-2007, 09:06 AM

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.

xoxoxoBruce · 02-15-2007, 12:10 PM

Quote:

Originally Posted by Elspode

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.

02-15-2007, 09:06 AM	#1
Elspode When Do I Get Virtual Unreality? Join Date: Dec 2002 Location: Raytown, Missouri Posts: 12,719	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. __________________ "To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog

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