Drainage is the process in which water leaches downward from the upper soil layers to lower layers, or how surface water is removed. In geomorphology, a drainage system is the pattern formed by the streams rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, weather a particular region is dominated by hard or soft rocks, and the gradient of the land. Geomorphologists and
hydrologists often you streams as begin part of drainage basins.
A drainage basin is the topographic region from which a stream receives runoff, through flow, and groundwater flow. Drainage basins are divided from each other by topographic barriers called a watershed. A watershed represents on of the streams tributaries that flow to some location along the stream channel. The number, size, and shape of drainage basins found in an area varies and the larger the topographic map, the more information on the drainage basin is available.
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