what is river basin and water divide?
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Answer:
A drainage basin is a region of land where water from rain or snowmelt drains downhill into a body of water, such as a river, lake, dam, estuary, wetland, sea or ocean. ... Each drainage basin is separated topographically from adjacent basins by a ridge, hill or mountain, which is known as a water divide or a watershed.
A drainage basin is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water. The drainage basin includes all the surface water from rain runoff, snowmelt, hail, sleet and nearby streams that run downslope towards the shared outlet, as well as the groundwater underneath the earth's surface.[1] Drainage basins connect into other drainage basins at lower elevations in a hierarchical pattern, with smaller sub-drainage basins, which in turn drain into another common outlet.[2]
Illustration of a drainage basin. The dashed line is the main water divide of the hydrographic basin.
Digital terrain map of the Latorița River's drainage basin in Romania
Digital terrain model of the Latorița River's drainage basin in Romania
Other terms for drainage basin are catchment area, catchment basin, drainage area, river basin, water basin,[3] [4] and impluvium.[5][6][7] In North America, the term watershed is commonly used to mean a drainage basin, though in other English-speaking countries, it is used only in its original sense, that of a drainage divide
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