The last time we worked this subject over was almost exactly ten years ago ("Big-ass drain hole" 2/14/07).
Lake Berryessa is quite near me and I have seen the drain in both conditions.
Flowing, it is indeed awesome.
News articles usually portray it as a "big bathtub drain," which is exactly what it is not.
http://cellar.org/showthread.php?t=1...ght=glory+hole