floods intro,causes ,preventive measures class 9
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intro - in plain English, a flood is an excess of water or mud on land that is normally dry. A flood is a condition that occurs when water overflows the artificial or natural boundaries of a stream, river, or other body of water onto normally dry land. Floods often happen due to heavy rainfall or thawing snow.
causes - Massive Rainfall.
Overflowing of the Rivers. ...
Collapsed Dams. ...
Snowmelt. ...
Deforestation. ...
Climate change. ...
Emission of Greenhouse Gases. ...
preventive measures - Embankments, flood walls, sea walls.
Dams and reservoirs.
Natural detention basins.
Channel improvement.
Drainage improvement.
Diversion of flood waters.
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