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fall structure with a fixed chamber in which the water level changes

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About lock

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 chamber in a permanently fixed position in which the water level can be varied. In a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself that rises and falls.

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Facts from Wikidata (CC0). Image by Biberbaer via Wikimedia Commons (CC BY-SA 3.0).

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