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GIS technology has allowed for the modeling of catchment areas, and in particular those relating to urban areas. Based on travel time between rural areas and cities of different sizes, the urban–rural catchment areas (URCAs) is a global GIS dataset that allows for comparison across countries, such as the distribution of population along the rural–urban continuum. [8]
The list of drainage basins by area identifies basins (also known as "catchments" or, in North American usage, "watersheds"), sorted by area, which drain to oceans, mediterranean seas, rivers, lakes and other water bodies.
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin. It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, [3] [4] and impluvium. [ 5 ] [ 6 ] [ 7 ] In North America, they are commonly called a watershed , though in other English-speaking places, " watershed " is used only in its original sense, that of the drainage divide line.
Catchment zone in Nattai, Australia containing drinking water. Catchment hydrology is the study of hydrology in drainage basins. Catchments are areas of land where runoff collects to a specific zone. This movement is caused by water moving from areas of high energy to low energy due to the influence of gravity.
Water Management Areas (WMAs) are parts of South Africa that are managed by Catchment Management Agencies (CMAs). A CMA is established in terms of the National Water Act of 1998. A CMA is established in terms of the National Water Act of 1998.
FAO Major Fishing Areas. The defined areas are: [2] Area 18: the Arctic Ocean; Area 21: the Northwestern part of the Atlantic Ocean; Area 27: the Northeastern part of the Atlantic Ocean; Area 31: the Western part of the Atlantic Ocean; Area 34: the Eastern Central part of the Atlantic Ocean; Area 37: the Mediterranean Sea and the Black Sea
The total catchment area of the river is 69,552 km 2 (26,854 sq mi) up to its confluence with the Krishna and it is 28,177 km 2 (10,879 sq mi) up to Tungabhadra Dam. It is influenced chiefly by the South-West monsoon. It is a perennial river, but the summer flows dwindle to as low as 2.83 to 1.42 cumec (100 to 50 cusec). [1]