Water on Earth moves continuously followed a cycle of evaporation and transpiration vapor (evaporation of evacuation). Condensate Precipitation and flow through Usually go to the sea. Evaporation and transpiration to precipitation down to the ground.Safe drinking water is essential for human beings and other creatures, even if there is no water, the calories or nutrients as any organic compounds. Access to clean drinking water has changed over the centuries in almost every part of the world, an estimated 1 billion people still lack safe drinking water and 2.5 billion people lack adequate sanitation [7]. With water clean and value GDP per person [8]. However, the The observer, some people estimate that in the years 2025, more than half the world's population will suffer the problem of water-related risks [9]. The latest report in November 2009, reports that in the year 2030 in developing countries area, there will be a demand for water will increase the amount of water that has more than 50% [10] water plays an important role in the world economy, because water is a solvent for various types of chemicals and facilities providing cooling in industry and transport; About 70% of the fresh water humans use goes to agriculture [11].
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