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In page Geography of China:

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There is a steep drop in the river level in the North China Plain, where the river continues across the delta, it transports a heavy load of sand and mud which is deposited on the flat plain. The flow is aided by manmade embankments. As a result, the river flows on a raised ridge fifty meters above the plain. Waterlogging, floods, and course changes have recurred over the centuries. Traditionally, rulers were judged by their concern for or indifference to preservation of the embankments.[citation needed] In the modern era, China has undertaken extensive flood control and conservation measures.