A typical waterwheel has a diameter of 16.5 meters. During the flooding season, it would sit on the southern bank of the Yellow River trundled by the flowing river. Other times of the year, water stored in the cofferdam in canals would be used to push the waterwheel. The theory of waterwheel is incredibly simple but smart: a number of water baskets are attached around the outer bound of the waterwheel; the water comes in from one side of the waterwheel.
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