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Tag: River

Major River Systems in the Arctic
The Arctic has several of the world’s largest rivers.This graphic shows the major river systems of the Arctic and their annual discharges in cubic kilometres, and the catchment area of the Arctic Ocean. The major river s...
28 Sep 2005 - by CAFF (Conservation of Arctic Flora and Fauna); see source field
Major River Systems in the Arctic
The Arctic has several of the world’s largest rivers.This graphic shows the major river systems of the Arctic and their annual discharges in cubic kilometres, and the catchment area of the Arctic Ocean. The major river s...
28 Sep 2005 - by CAFF (Conservation of Arctic Flora and Fauna); see source field
Trends in continental river discharge
River flow is cyclical in nature, with alternating cycles of wet and dry years. This graphic uses bar graphs to show the average annual volumes of river runoff in cubic kilometres for each continent from 1921 to 1985. Ov...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Trends in continental river discharge
River flow is cyclical in nature, with alternating cycles of wet and dry years. This graphic uses bar graphs to show the average annual volumes of river runoff in cubic kilometres for each continent from 1921 to 1985. Ov...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Renewable freshwater supplies, per river basin
Freshwater represents a crucial sort for human development, for nature and for ecosystem services. This graphic compares freshwater supplies in cubic metres per capita, per river basin in 1995 with a projection of freshw...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Renewable freshwater supplies, per river basin
Freshwater represents a crucial sort for human development, for nature and for ecosystem services. This graphic compares freshwater supplies in cubic metres per capita, per river basin in 1995 with a projection of freshw...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Freshwater availability: groundwater and river flow
This graphic shows the availability of freshwater through average river flows and groundwater recharge, in cubic metres per capita per year, at the national level in the year 2000. The graphic highlights the countries wi...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Freshwater availability: groundwater and river flow
This graphic shows the availability of freshwater through average river flows and groundwater recharge, in cubic metres per capita per year, at the national level in the year 2000. The graphic highlights the countries wi...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Phosphate levels in major basins
A comparison of the major watersheds between the two decades showed that Northern Europe and North America had lower phosphate concentrations, while the Ganges and Brahmaputra watersheds in South Central Asia had higher ...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Phosphate levels in major basins
A comparison of the major watersheds between the two decades showed that Northern Europe and North America had lower phosphate concentrations, while the Ganges and Brahmaputra watersheds in South Central Asia had higher ...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
World's water cycle: schematic and residence time
The water cycle consists of precipitation, evaporation, evapotranspiration and runoff. This graphic explains the global water cycle, showing how nearly 577 000 km3 of water circulates through the cycle each year. A table...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
World's water cycle: schematic and residence time
The water cycle consists of precipitation, evaporation, evapotranspiration and runoff. This graphic explains the global water cycle, showing how nearly 577 000 km3 of water circulates through the cycle each year. A table...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Major river basins of Africa
This map shows the locations of 13 major river basins in Africa: the Senegal, Volta, Niger, Lake Chad, Nile, Lake Turkana, Juba Shibeli, Ogooue, Congo, Zambezi, Okavango, Limpopo and Orange river basins.
17 May 2005 - by Philippe Rekacewicz, Delphine Digout, UNEP/GRID-Arendal
Major river basins of Africa
This map shows the locations of 13 major river basins in Africa: the Senegal, Volta, Niger, Lake Chad, Nile, Lake Turkana, Juba Shibeli, Ogooue, Congo, Zambezi, Okavango, Limpopo and Orange river basins.
17 May 2005 - by Philippe Rekacewicz, Delphine Digout, UNEP/GRID-Arendal
Alkalinity in major rivers
This graphic shows the average bicarbonate concentrations, in milligrams per litre, at major river mouths for the time periods 1976 to 1990 and 1991 to 2000. The graphic also shows the changes in average bicarbonate leve...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Alkalinity in major rivers
This graphic shows the average bicarbonate concentrations, in milligrams per litre, at major river mouths for the time periods 1976 to 1990 and 1991 to 2000. The graphic also shows the changes in average bicarbonate leve...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
From wetlands to dry lands: the destruction of the Mesopotamian marshlands
The Mesopotamian marshlands in the Tigris and Euphrates river basins were devastated by damming and river channelisation during the late 1980s. This graphic illustrates the decline in the area's marshlands by comparing t...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
From wetlands to dry lands: the destruction of the Mesopotamian marshlands
The Mesopotamian marshlands in the Tigris and Euphrates river basins were devastated by damming and river channelisation during the late 1980s. This graphic illustrates the decline in the area's marshlands by comparing t...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Long-term variations in river flow, by continent
River runoff is cyclical in nature, with alternating cycles of wet and dry years. Significant deviations from average values differ in duration and magnitude. For example, 1940-44, 1965-68 and 1977-79 are clearly low per...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Long-term variations in river flow, by continent
River runoff is cyclical in nature, with alternating cycles of wet and dry years. Significant deviations from average values differ in duration and magnitude. For example, 1940-44, 1965-68 and 1977-79 are clearly low per...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
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