Water is a clear, colourless, testless and odorless liquid that is essential for life. Water is among the natural resources that occupies 708 of the earth surface (Willy et al, 2008). The human body needs about three to four litres of water per day for its normal functions. Apart form drinking and body functions, man needs water for various purposes including for use in transportation, recreation, water disposal, hydroelectric system (Onyeagba and Isu 2009).
Water is a good solvent and is often reffered to as the universal solvent. It is transparent in the visible electromagnetic spectrum. Aquatic plants can live in water because sunlight can reach them. Ultraviolent and infrared light is strongly absorbed. Chemically, water is made up of two moles of hydrogen and one mole of oxygen in the ratio 2:1 the boiling point of water (and all other liquids) is dependent on the barometric pressure. For example, at the top of mount. Everest water boils at 680C (1540F) compared to 1000C (2120F) at the sea level conversely, water deep in the ocean near geothermal vets can reach temperature of hand reds or degrees and remains liquid.