ABSTRACT
Although, three-quarters of earth is covered with water, not all of it is available for human consumption. Ninety seven percent of water is in oceans and seas and only 3% is freshwater. Of this 3% of freshwater 77.6% is frozen polar ice, 21.8% is groundwater, part of which is too deep, only fraction of the water (0.6%) is available surface water (rivers, lakes representing 0.34% of the planets atmosphere) in atmosphere, soil or aquifers.
