Glory Hole

Glory Hole
Peculiarities of human nature that intentionally created man-made or otherwise, the next is glory hole.
This hole is the largest spillway in the world.
According to information I can from the internet and television,

These holes are used when the water already exceeds the capacity of the reservoir and should be reduced in volume.

By this measure makes it possible to consume 14,400 cubic of water every second.
Hole locations are located in Monticello Dam, California, USA.

source: http://unique.shootrun.net