Lock (water navigation)
Device for raising and lowering boats or ships / From Wikipedia, the free encyclopedia
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Not to be confused with Loch.
"Gate (water transport)" redirects here. Not to be confused with Water gate.
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.[1]
Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level.[2] Later canals used more and larger locks to allow a more direct route to be taken.