In the middle of the Monticello Dam in Lake Berryessa, Northern California, there's a massive drain hole. It's called the Morning Glory Spillway, but has also earned the affectionate nickname "The Glory Hole." At 22 meters in diameter, the hole sucks in water from the dam to prevent flooding at a rate of 1,300 cubic meters per second when it reaches capacity, according to Atlas Obscura. The water is carried through a large concrete pipe and emptied about 210 meters away. Follow us!: Engineering
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