Hydrological Cycle is a continuous water circulatory system. It is present in the world since time immemorial but human being felt its presence later on.
Most of ancient civilization was flourished on the banks of river. This mean civilization flourished where there was assured source of supply of water meeting various demand of human beings. During 2000 B. C. , many ground water developments were made through wells. In early period, Aristotle and Plato put forward the concept of underground sea below the surface of the earth responsible for the arability of ground water. Leonardo Da Vinchi and Bernard Pallissy were among the first to give the physics based theory of infilteration. Hindu scriptures indicate the existence of the knowledge of hydrological cycle in the Vedic period. Chanakya 300 B.C. , in the Arthasastra, describes the first description of the rain-gauge and its use. Most of the present day science of hydrology has been developed since 1930.
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