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美国是世界上岩溶大泉最多的国家之一,它的南部石灰岩分布面积广雨量大,出露有流量大于2.8米~3/秒(100英尺~3/秒)的岩溶大泉40多处。最大的银泉(SILVER SPRING),最枯流量15.3米~3/秒。对这些岩溶大泉做过不少的水文地质工作。1985年
The United States is one of the countries with the largest number of karst springs in the world. Its southern limestone area is characterized by a large amount of rainfall and more than 40 karst springs with a flow rate of more than 2.8 m 3 / s (100 ft 3 / s). The largest Silver Spring (SILVER SPRING), the most flow of 15.3 meters to 3 / second. For these karst springs have done a lot of hydrogeological work. 1985