An overtopping device harnesses the power of waves by creating a small barrier for the waves, which flood over the wall into a reservoir. The water then flows through turbines, similar to those of hydro dams, and them back out into the ocean. Overtopping devices also require a large amount of space to be built due to the minimum capacity that the reservoir requires function; nevertheless, the structure can be floating or built on land.
(Aquaret, http://www.aquaret.com/index.php?option=com_content&view=article&id=137&Itemid=280&lang=en)
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