|"Hydrology is the science which deals with the waters of the earth, their occurrence, circulation and distribution on the planet, their physical and chemical properties and their interactions with the physical and biological environment, including their responses to human activity." (UNESCO,1964)|
A Water cycle in nature is called "the Hydrologic Cycle". Hydrology is the
study of this water cycle on the earth.
Hydrology treats precipitation, snow, ice, evapotranspiration, surface flow, erosion and acuumulation, water quality, and systems of water resources and their interactions.
Precipitation and evapotranspiration have been a main topics of meteology, and now they are also included in the subjects of hydrology as important processes of water cycle.
Hydrology and Water resource engineering relate to various branches of learning.
Olmost everything conserned with water are treated in Hydrology, not only