How might a dam across a river be effective in reducing floods, and how might that effectiveness be reduced if the dam was also designed and operated to generate electricity?
Answer:
A dam can be used to moderate the flow on the stream below if water is released during dry periods and then held back during very wet periods. If the dam is also used to produce energy the operator may choose to let as much water flow as possible when the demand is high, and this could compromise the flood-control function of the dam.
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