Life on the earth needs water. Water is an essential need for life and particularly human beings. It is not astonishing that our ancestors developed works for supplying drinkable water and then for agricultural purposes in thousands of years. In China and in Babylonian regions, reservoirs have been built from the antiquity along with the development of agriculture. This need is still vital today. Hydroelectric schemes give access to drinkable water, lands irrigation, production of mechanical and electrical energy, participation to transport of people and goods and so on.

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