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Geography Optional 300+ Score Pack · Model answer

Comment on the criteria of identifying Drought Prone Areas in India.

  • UPSC 2014
  • Regional Development and Planning

The moisture-deficiency criterion. The climatic core is the moisture index of Charles Warren Thornthwaite — water surplus minus deficit as a percentage of potential evapotranspiration; -20 to -40 is semi-arid, -40 to -60 arid, and the semi-arid band carries almost the whole Indian drought-prone tract.

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