Reading: kouzuii
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Flooding indicates a significant increase in the level or volume of water in a river. Factors that increase the volume of water include heavy rainfall and snowmelt. A flood also occurs when the flow from upstream to the dam lake is higher than usual, even if the river is not overflowing.
In the case of weather forecasts, when the water level gauge of a river exceeds the warning level, it is called a flood and is the basis for issuing a flood warning.
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