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Hydrology is the science which studies the water cycle as a whole, hence the water exchanges between soil and atmosphere (precipitation and evaporation) but also between the soil and sub ground (groundwater). Switzerland has a varied and complex hydrological system. The climate gives precipitation under the form of snow and rain and is also responsible for the evaporation of water into the atmosphere. The altitude and climate allow the formation and maintenance of many glaciers that feed rivers from five major European river catchments, through which water leaves the country and joins the sea. Switzerland is sometimes called the "water tower of Europe".〔( Eine grosse Verantwortung für das "Wasserschloss Europas" ) bafu.admin.ch. Retrieved 2011-04-12〕 ==Surface water== Surface water flows through a network of nearly 65,000 km of rivers, shared between the basins of five European rivers: the Rhine, the Rhone, the Po, the Danube and the Adige. Thus, the hydrological network of Switzerland brings feeds the North Sea, the Mediterranean Sea, the Adriatic Sea and the Black Sea. Among these five rivers, two have their source in Switzerland, the Rhine and the Rhone. The other three rivers have tributaries that originate in Switzerland. All major lakes of Switzerland are located in the Rhine, Rhone and Po basins. Lakes in the Danube and Adige basins are less than 5 km². 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「Hydrology of Switzerland」の詳細全文を読む スポンサード リンク
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