Un-Dammed


(YouTube link)

On October 26th, explosives opened the Condit Dam in Washington State to allow the free flow of the White Salmon River after 98 years. The reservoir took about two hours to drain, shown here in time-lapse. Read about the dam dismantling project at National Geographic. Link -via the Presurfer


Neat! When I was a kid, we lived next to a lake whose dam broke in the middle of the night. It took about a week for the lake bed to be dry enough to walk on but it was great fun after that. We found all kinds of interesting things that had been lost in the lake over the years, including watches and old LPs. Much to our parents regret, we had epic mud wars. Much more fun than the lake ever had been.

Eventually it dryed up and started to look like the surface of Mars. The soil was incredible for growing crops. It's been over thirty years and last time I looked, you couldn't tell there was ever a lake there. It's filled with trees and bushes. A stream flowing through the middle is all that is left of the old lake.
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Look how silted up that lake was. Reservoirs need to be drained regularly for that reason and others. If they are not their capacity is reduced over time.

@Jon A. since it clearly wasn't a disaster why would you say that?
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Bill, the Wikipedia page about the dam, and the restoration project, says that there was debate about gradual vs. quick draining, and the conclusion was that quick draining would have less overall impact.
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