Study Material | Test Series | Crash Course
Drishti IAS
call1800-121-6260 / 011-47532596
Drishti The Vision Foundation
(A unit of VDK Eduventures Pvt. Ltd.)
Current Affairs Crash Course Download Player Download Android App
Surplus river basins face drop in rainfall
Aug 10, 2016

A study carried out by a team of researchers from IIT Madras and IIT Bombay has found a decrease in spatial variability of mean monsoon rainfall over major river basins in India.

  • While there is a statistically significant decrease in the monsoon rainfall over major water surplus river basins, there is no statistically significant increase in monsoon rainfall over major water deficit river basins.
  • Major surplus basins such as Mahanadi, Godavari, Brahmani and West Flow River-I are witnessing significant decrease in rainfall. Other surplus basins also exhibited decrease in rainfall but they are not statistically significant
  • The decrease in water yield in recent periods in major surplus basins has been more than 10 per cent in the case of Mahanadi and West Flow River-I. In the case of other surplus basins, the decrease has been within 10 per cent.
  • Ganga, which is a major water deficit basin, has seen significant increase in rainfall, while Yamuna, Krishna and Cauvery river basins exhibit a decrease.
  • There has been an increase in extreme rainfall events in India but this does not play a significant role in water availability as the surplus water gets wasted.
  • Though water yields in major deficit river basins such as Indus, Ganga and East Flow River-II have increased during the period 1976-2000 compared with the previous 25 years (1951-1975), the trend is not statistically significant

Challenge in Interlinking

  • The changes in rainfall pattern over major river basins in India raises concerns regarding the suitability and viability of interlinking major river water basins.
  • The water demand in a surplus basin first needs to be assessed and then met under decreasing water availability scenarios before transferring water to deficit basins. Hence, planning for inter-basin water transfer [in order to supply water from surplus to deficit river basins] necessitates an immediate reassessment with a systematic


Helpline Number : 87501 87501
To Subscribe Newsletter and Get Updates.