World's Largest Drain Hole.

Fogonazos has a neat story about the largest drainhole in the world: a spillway at the Monticello Dam in northern California. Link

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It just drains out the other side of the dam. Follow the link and you'll see people using the horizontal part as a skate board park during the dry season.

Now that I think of it, my neighbor's man made swimming pond operates on a similar, albeit many times smaller, principle.
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Excuse my ignorance on the subject but where does it drain into?
Its been unusually wet over here (in Soggy Scotland) this year so I may have answered my own question.
Perhaps there is a subterranean continent which has also experienced the worst flooding in memory.
Could'nt you Americans with all your technology send a probe, with camera to investigate?
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I've stood next to the one at Harriman Dam in Vermont. It was very scarry. I can imagine how a spider feels getting washed down the tub drain.
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