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dam : ウィキペディア英語版
dam

A dam is a barrier that impounds water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for such activities as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions.
The word ''dam'' can be traced back to Middle English,〔http://www.bartleby.com/〕 and before that, from Middle Dutch, as seen in the names of many old cities.〔Source: ''Tijdschrift voor Nederlandse Taal- en Letterkunde'' (''Magazine for Dutch Language and Literature''), 1947. The first known appearance of ''dam'' stems from 1165. However, there is one village, Obdam, that is already mentioned in 1120. The word seems to be related to the Greek word ''taphos'', meaning "grave" or "grave hill". So the word should be understood as "dike from dug out earth". The names of more than 40 places (with minor changes) from the Middle Dutch era (1150–1500 CE) such as Amsterdam (founded as 'Amstelredam' in the late 12th century) and Rotterdam, also bear testimony to the use of the word in Middle Dutch at that time.〕
==History==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「dam」の詳細全文を読む



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