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The Chinese have long sought to control the Huang He by building dikes and overflow channels. Silt deposition, the principal cause of flooding, has elevated the riverbed; in places the river flows 60 to 70 ft (18-21 m) above the surrounding plains. During the summer high-water period, water pressure against the dikes can break through the retaining walls to cause devastating floods, which have led the Huang He to be called "China's Sorrow." ...
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