The total volume of drinking water accounts for approximately 3% of the total volume of water on ground. Indeed, the major part of water is in the oceans and the seas.
The drinking water is essential in the human society for the production of resources through irrigation, the agriculture and the industrial production related to the raw material transformation.




The cycle of water represents the major phenomenon responsible for the transfer of material during erosion and the dislocation of the emerged continents (physical component). It regulates the productivity of the ecosystem and maintains the biodiversity (biological and geochemical component).
The river transport, hydrological stops for the energy production, and human consumption are also dependant on the cycle of water. With a population constantly in growth (6.5 billion human), the drinkable water requirements become paramount. More than 1 billion people do not have access to drinking water (drinkable). Approximately 2.5 billion people is private of medical decent for lack of water and more than 5 thousand people especially of the children die the every day of diarrhea related to the water pollution (source: World Water Assessment Programs, 2003).
The man modifies planetary geology (transport and reconditioning of the ground during constructions), causes the gas emission with greenhouse effect, and of this fact the biosphere modifies. Today, the disappearance of species of animals and plants reach a rate from 100 to 1000 times superior with that of the natural evolution.


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