Like air water is one of the basic materials which is of prime importance for the preservation of life on this earth. All are aware of the uses of water drinking, cooking, bathing and farming etc. , but few know the importance of water as an engineering material. As an engineering material water is used to produce steam in boilers to generate hydro electric power, furnishing steam for engines, for refrigeration and air conditioning, for construction of concrete structures for manufacturing purposes and as a solvent in chemical process. Hence an engineer should posses knowledge regarding the composition, troubles that arise due to composition of water and prevention of these troubles.
Water is widely distributed in nature. It has been estimated that about 75% matter on earth’s surface consists of water. Besides visible water on earth, there is a large amount of water under earth to an average
SOURCES OF WATER :
THE MAIN SOURCES OF NATRAL WATER ARE FOLLOWING :