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Consider the following statements about river systems in India 1. Around 77% of the drainage area of the country is oriented towards the Arabian sea. 2. Over 90% of the water drains into the Bay of Bengal; the rest is drained into the Arabian Sea or forms inland drainage. Which of the above statement is not correct?

Consider the following statements about river systems in India 1. Around 77% of the drainage area of the country is oriented towards the Arabian sea. 2. Over 90% of the water drains into the Bay of Bengal; the rest is drained into the Arabian Sea or forms inland drainage. Which of the above statement is not correct? Correct Answer 1 only

The correct answer is 2 only.

  • Around 23% of the drainage area of the country is oriented towards the Arabian sea. Hence, statement 1 is incorrect.
  • Over 90% of the water drains into the Bay of Bengal; the rest is drained into the Arabian Sea or forms inland drainage. Hence, statement 2 is correct.

Key Points

  • The River system of India can be classified into two groups:
    • The Bay of Bengal drainage (Rivers that drain into the Bay of Bengal) (East flowing rivers)
    • The Arabian sea drainage (Rivers that drain into the Arabian sea) (West flowing rivers)
  • Around 77 percent of the drainage area of the country is oriented towards the Bay of Bengal.
  • The Ganga, the Brahmaputra, the Mahanadi, the Godavari, the Krishna, the Cauvery, the Penneru, the Penneiyar, the Vaigai, etc drain into the Bay of Bengal.
  • The Indus, Narmada, Tapi, Sabarmati, Mahi drain into the Arabian sea.
  • The area covered by The Bay of Bengal drainage and the Arabian Sea drainage is not proportional to the amount of water that drains through them.
  • This lopsided drainage is because of:
    • The Arabian Sea drainage or Western drainage receives less rainfall.
    • The Eastern drainage or the Bay of Bengal drainage receives rainfall from both South-west and northeast monsoons.
    • Most of the Himalayan waters (perennial rivers) flow into eastern drainage.
    • Indian Rivers that flow into the Arabian Sea are seasonal or non-perennial.
    • The occurrence of more cyclonic rainfall in the eastern parts is another major reason.

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