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Types of Drought

There are three types of drought

  • Meteorological Drought describes a situation where there is a reduction in rainfall for a specific period (days, months, season or years) below a specific amount (long term average for a specific time).
  • Hydrological Drought involves a reduction in water resources (stream flow, lake level, ground water, underground aquifers) below a specified level for a given period of time
  • Agricultural Drought is the impact of meteorological/hydrological drought on crop yield.


Rainfall


The Indian subcontinent experiences an average rainfall of around 1200 mm and as such its water resources are enormous and are well comparable to any other country of its size and magnitude. However the problem lies in its distribution across the country, ranging from over 10,000 mm at cherrapunji and 8500 mm in parts of western Ghats at one end to around 200-350 mm in parts of western Rajasthan and Gujarat at the other. Because of the erratic behavior of the rainfall, even the medium rainfall region is vulnerable to drought conditions. Consequently, 68% or roughly 2/3 of the country's arable area is at one time or the other susceptible to drought. Most of the major states have both drought as well as high rainfall areas and these are situations in states like Bihar, where while the northern part is reeling under floods, some of the southern districts falling in the rain shadow are simultaneously under drought. The drought of 1987, caused by the failure of the southwest monsoon over large parts of India, was one of worst in the century. Only 14 out of the 35 meteorological sub-divisions of the country received normal or excess rainfall: 18 sub -divisions received deficient and 3 received scanty rainfall. Approximately 37 percent of the geographical area of the country received normal rainfall, leading to an overall deficiency of (-19 percent) The delayed monsoon affected agricultural operations in 43 percent of the cropped area, with Rajasthan and Gujarat being the worst affected states. The Prime Minister set up Cabinet Committee on Drought (CCD), which formulated an action plan and closely monitored its implementation. By adopting an effective agricultural contingency plan incorporating optimum use of water resources, the loss in production could be minimised .The Action Plan emphasized on a) Employment Generation, b) Provision of drinking water, c) Fodder availability, d) Supply of essential commodities and e) Drought Proofing as drought mitigation measures.




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