Water moving at 25 mph has the pressure equivalent of wind blowing at 790 mph — greater than the speed of sound. No surprise, then, that a sewer geyser has the power to lift a Ford Focus right off the pavement.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/RcaWRlLw-fM/watch-the-crazy-force-of-a-sewer-geyser-lift-a-car-in-the-air
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