Definition: Hydrology is the scientific study of water systems; its objects are rivers, lakes, wetlands, soil, groundwater, and surface waters. It includes the theory that explains how water moves between bodies of water and land. The term "hydrological" comes from the Greek words hydro means "water" and logia (from Greek -logos) which means study or knowledge. The word is used to refer to a system's processes related to water flow.
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