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Resources of Water

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Rural Technology

70% of earth surface is occupied by water. If we started measuring water on the earth then the figure will be too big even if we measured in cubic kilometers. If all water on earth is imagined to be filled in kerosene bottle (700ml) then available drinkable water will be equal to maximum one tablespoon. Out of which only 7 drops from it will be in the lake and river. Remaining all water is percolated as ground water.

Approximate water in the world 1.36 x109 Km3 100%

Salty water 97%

Drinkable water (Including snow) 3.7 x 107Km3 2.7%

Water in the form of snow 2%

Water in liquid form 9.5 x106 Km3 0.7%

Ground water 8.16 x106 Km3 0.6%

Water in river & lake 1.34 x106 Km3 0.1%


This shows there is more ground water than the water in the river and lake. Ground water means water percolated in the ground through cracks and pores of the sand/soil.

Total water on the earth always remains constant. It never increases or decreases. Water from ocean evaporates. These water vapors form clouds. When clouds get condensed due to low temperature, it rains. Rain water percolate in the ground, flows through the river and at the end goes to the sea. The same water again evaporates to form cloud. In this way same water gets rotated in different form. This is called as hydraulic cycle.




Total water available in the world


World(Km3) India(Km3) 1) Evaporation On the ocean 350,000 On the ground 70,000 2,300 2) Rain, Snow & water On the ocean 320,000 On the ground 100,000 4,000 3) In the Ocean Flowing water Through the river 28,000 1,100 Through the land 600

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