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A drainage basin is a fundamental unit of study in hydrology and water resources management. It refers to an area of land where all surface water from precipitation, streams, and runoff drains into a common outlet such as a river, lake, reservoir, or ocean. It is also known as a catchment area or watershed. The boundary of a drainage basin is defined by elevated landforms called drainage divides or watershed boundaries, which separate one basin from another. The size of drainage basins varies from small local catchments to large river basins covering thousands of square kilometres. A drainage basin consists of several important components, including precipitation, surface runoff, streams, tributaries, groundwater flow, and the main river channel. The hydrological cycle within a basin involves processes such as infiltration, __________ _______ ________ ___ ______ ________ ________ _________ _____ ________ ________ _________.
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