CBSE - IX - Biology - Natural Resources
what is the main causes of floods ?
- The major cause of flood is heavy rainfall in the catchment areas of rivers and in the poorly drained areas. When the level of water rises above the river banks or dams, the water starts overflowing. The water overflows to the areas adjoining to the rivers, lakes or dams, causing floods or deluge.
- Floods are also caused due to heavy snow melting, caused by global warming. The rising temperature makes the snow caps melt faster. Continuous and fast melting snow raises the level of oceanic water, which consequently raises the level of water in rivers, leading to floods.
- Floods also occur more in the coastal regions. Floods, in the coastal regions, are caused due to high tides, storms, cyclones, hurricanes, or tsunamis. When the level of water rises above the sea level, it causes floods in coastal areas or coastal lowlands.
- There are also several human causes of floods. Deforestation is one of the major causes of floods. Sometimes floods are caused due to poor dams that can not hold great volume of water and they give up causing floods in adjoining areas.
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