Barrage

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A barrage is a type of low-head, diversion dam which consists of a number of large gates that can be opened or closed to control the amount of water passing through. This allows the structure to regulate and stabilize river water elevation upstream for use in irrigation and other systems.

Excerpt from the Wikipedia article “Barrage (dam)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bob Tan, CC BY-SA 4.0, via Wikimedia Commons.