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A jetty is a man-made structure that protrudes from land out into water. A jetty may serve as a breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French word jetée, , signifying something thrown out.

For regulating rivers

Wing dams

Jetties of one form, wing dams, are extended out, opposite one another, from each bank of a

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