Yellow River at Zhengzhou
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The river is extremely prone to flooding. It has flooded 1,593 times in the last 3,000–4,000 years, while its main course changed 12 times, with at least 5 large-scale changes from 602 BC to present. These course changes are due to the large amount of loess carried by the river and continuously deposited along the bottom of the river's canal. This sedimentation causes a natural dam to slowly accrue. Eventually, the enormous amount of waters have to find a new way to the sea, causing a flood in a new valley. Flooding was unpredictable, causing difficulty to farmers. (Wikipedia)
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