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Catchment areas may be established for the provision of services. For example, a school catchment area is the geographic area from which students are eligible to attend a local school. When a facility's capacity can only service a specific volume, the catchment may be used to limit a population's ability to access services outside that area. [11]
Hồng (紅) is a Sino-Vietnamese word for "red" or "crimson". The delta has the smallest area but highest population and population density of all regions. The region, measuring some 15,000 square kilometres (6,000 sq mi) is well protected by a network of dikes. It is an agriculturally rich and densely populated area.
The Vietnamese government often groups the various provinces and municipalities into three regions: Northern Vietnam, Central Vietnam, and Southern Vietnam.These regions can be further subdivided into eight subregions: Northeast Vietnam, Northwest Vietnam, the Red River Delta, the North Central Coast, the South Central Coast, the Central Highlands, Southeast Vietnam, and the Mekong River Delta.
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.
The 126,880 hectare Phou Dendin Important Bird Area (IBA) is located within the 222,000 hectare Phou Den Din NBCA. The IBA altitude varies between 500–1,900 metres (1,600–6,200 ft) above sea level. Topographical elements include the Nam Ou River and its catchment, the area at the confluence of the Nam Khang River, mountainous terrain, and ...
The classification of urban areas in Vietnam is based on a series of factors, including population, density, and the proportion of non-agricultural labor. The classification framework is outlined in Resolution No. 1210/2016, [3] which provides the following criteria for each type of urban area:
Regions of Vietnam Topographic map of Vietnam. Vietnam is located on the eastern margin of the Indochinese peninsula and occupies about 331,211.6 square kilometres (127,881.5 sq mi), of which about 25% was under cultivation in 1987.