double gates, separating the upper and lower Miraflores locks of the Panama Canal, closing

The double gates, separating the upper and lower Miraflores locks, closing. Water pressure, caused by differential levels between the locks, forces the gates shut and seals them. It is impossible to open a lock gate as long as the upper lock has a higher water level. The entire system is run by gravity and water displacement. Although the gates are immensely heavy, and they hold back a couple hundred-thousand tons of water, they require less than 25 hp to open and close because they are actually floating.

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