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We know that water is necessary, both for sustainable human development and for the healthy functioning of the planet’s ecosystem. Availability of freshwater globally however, is limited. Out of the 2.7 per cent of a total amount of 1 400 million km3 of freshwater, the major portion occurs in the form of permanent snow cover or deep aquifers and only a small fraction is available for use.
Although India has to support 16 per cent of the world’s population and 15 per cent of livestock, we have only 2.4 per cent of the land and 4 per cent of the water resources of the world. Out of about 4 000 km3 of precipitation in a year, as much as 3 000 km3 comes as rainfall in a short monsoon period of three to four months from June to September. The distribution of the water thus available is not uniform and is highly uneven in both space and time. The average annual water resource potential of the country is estimated to be 1 869 km3. Due to hydrological, topographical and geological limitations, however, only 690 km3 of surface water can be utilized by conventional storage and diversion structures. The annual recharge of groundwater is 433 km3.
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