Total water in the world is estimated as 1.5 billion cu. km. 95% pf this is salty water found in oceans. And this is around 1.4 billion cu. km. Remaining 5% is fresh water i.e. only 75 million cu. km. Out of this 75 million 60 million cu km is frozen polar ice and snow, as only 15 million cu k is as fresh liquid water for living beings need/requirement.
Of 15 million cu km of fresh water 1% is surface water found in lakes, stream and rivers and about 99% is stored as underground at depths. About half of the ground water is stored at depths greater than 1,000 meters and is considered too expensive to pump to surface for uses.So about 7 millions cu km of fresh water at reasonable depth and 1,50,000 cu km of surface water.
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