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Consider the following statements about the drainage system in India 1. The Bay of Bengal drainage system consists of nearly 60% while the Arabian Sea drainage system consists of nearly 40% of drainage in India. 2. The catchment of small rivers is known as Basins while of large rivers is known as a watershed.  Which of the statements given above is/are correct?    

Consider the following statements about the drainage system in India 1. The Bay of Bengal drainage system consists of nearly 60% while the Arabian Sea drainage system consists of nearly 40% of drainage in India. 2. The catchment of small rivers is known as Basins while of large rivers is known as a watershed.  Which of the statements given above is/are correct?     Correct Answer Neither 1 nor 2

The correct answer is Neither 1 nor 2.

Key Points

  • A river drains the water collected from a specific area, which is called its ‘catchment area’.
  • An area drained by a river and its tributaries is called a drainage basin. The boundary line separating one drainage basin from the other is known as the watershed. Hence statement 2 is incorrect. 
  • The catchments of large rivers are called river basins while those of small rivulets and rills are often referred to as watersheds. There is, however, a slight difference between a river basin and a watershed. Watersheds are small in the area while the basins cover larger areas.
  • The Indian drainage systems may be divided on various bases. On the basis of discharge of water, it may be grouped into
    • The Arabian Sea drainage
    • The Bay of Bengal drainage
  • They are separated from each other through the Delhi ridge, the Aravalis and the Sahyadris.
    • Nearly 77 per cent of the drainage area consisting of the Ganga, the Brahmaputra, the Mahanadi, the Krishna etc. is oriented towards the Bay of Bengal while 23 per cent comprising the Indus, the Narmada, the Tapi, the Mahi and the Periyar systems discharge their waters in the Arabian Sea. Hence statement 1 is incorrect.

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