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What are the major causes of floods in Bihar?
A. Increased conversion of forests to agricultural and pastoral land in the middle of the hills in Nepal.
B.Increase in the annual rainfall in the annual runoff of Sapt-Kosi river.
C.The flow of Sapt-Kosi river has grown by 2.5 times.
D.All of the above.

Answer
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Hint: The most flood prone state in India is Bihar. Almost 16.5% of India’s flood prone areas are in Bihar. The Bihar flood in 2013 affected 5.8 million people.

Complete answer: In the North of Bihar lies Nepal, West Bengal is in the east,Uttar Pradesh in the west and Jharkhand in the South.Bihar receives heavy rainfall from June to October. It must be noted that some of the major causes of floods in Bihar are the increased conversion of forests to agricultural and pastoral land in the middle of the hills in Nepal, increase in the annual rainfall in the annual runoff of sapt-Kosi river, the flow of the sapt-kosi has grown by 2.5 times. Looking at the history of floods in Bihar,the state has been facing extensive floods for a long period of time. In recent years the condition has only degraded. In 1914 both Bengal and Bihar faced floods. Bihar was hit by an earthquake in 1934, followed by floods.Lakhs of people lost their lives and properties were destroyed. People lost their homes.
Option D is the right answer.

Note: In 2008, Bihar witnessed one of its worst floods. After this flood Bihar witnessed two years of droughts. The main river for these floods have been caused by the Kosi river. The following steps can be taken in order to control the floods:
1. Building embankments
2.Detention basins
3.Channel improvement.