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Tag: River

Water supply per river basin in 1995 and 2025
Although the absolute quantities of freshwater on earth have always remained approximately the same, the uneven distribution of water and human settlement continues to create growing problems freshwater availability and ...
26 Jan 2009 - by Philippe Rekacewicz,February 2006
Freshwater alkalinity: 1976-2008
Alkalinity is commonly used to indicate a water body’s capacity to buffer against acidity; that is, the ability to resist, or dampen, changes in pH. Thus, alkaline compounds in water, such as bicarbonates, carbonates, an...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
World's surface water: evaporation and runoff
Because much of the world’s surface water is far from concentrations of human settlements, not all of it is readily usable. Some facts concerning global freshwater concentrations: - It is estimated that the freshwater ...
26 Jan 2009 - by Phillippe Rekacewicz (Le Monde diplomatique), February 2006
The Mekong River - survival for millions
The Mekong River - survival for millions Following the course of the Mekong River helps to understand the human/river hydrological interdependence. From its source on the Tibetan Plateau it drops 5,000 metres and flows a...
26 Jan 2009 - by Philippe Rekacewicz
Africa’s rivers and lake basins cross many borders
The below shows the locations of 13 major river basins in Africa.
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), 2007
Renewable surface water produced internally
It is difficult to determine the amount of renewable water produced internally from the total renewable water resources (external and internal). However the FAO gives a rather precise definition of this indicator. Intern...
26 Jan 2009 - by GRID-Arendal
Main world’s river basins
Reservoirs are artificial lakes, produced by constructing physical barriers across flowing rivers, which allow the water to pool and be used for various purposes. The volume of water stored in reservoirs worldwide is est...
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
Freshwater resources: volume by continent
Glaciers and ice caps cover about 10% of the world’s landmass. These are concentrated in Greenland and Antarctica and contain 70% of the world’s freshwater. Unfortunately, most of these resources are located far from hum...
01 Oct 2009 - by Philippe Rekacewicz (Le Monde diplomatique)
Damming the world
The construction of large dams - defined as those with walls at least 15 metres high - has increased significantly over the past 50 years. The average height of new dams, estimated at 30-34 m from 1940-1990, increased to...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Industrial areas and seasonal zones of oxygen depleted waters
This graphic illustrates the strong link between areas with high densities of industrial activity and zones of seasonally oxygen-depleted waters. There is a strong link between areas with high densities of industrial ac...
26 Jan 2009 - by Phillipe Rekacewicz, (Le Monde diplomatique) February 2008
Seasonal patterns of precipitation and runoff
The infuence of glaciers on seasonal distribution of river fow is strongly dependent on annual temperature and precipitation cycles, and the proportion of the catchment occupied by glacier ice. Figure 4 compares precip...
06 Dec 2010 - by Riccardo Pravettoni
Salzach river discharge, Austrian Alps
Simulated contributions of glacier melt (frn/ice melt) to annual total runoff were calculated between 1 and 4%. In the period 1999–2000, when the glacier mass balance of Goldbergkees and Stubacher Sonnblickkees have been...
06 Dec 2010 - by Riccardo Pravettoni
Glacier shrinkage in hypothetical river basins
Downstream variation in the impact of glacier recession is illustrated in Figure 5, which shows modelled river fows for idealized catchments under climates representative of the western and eastern Himalaya and a 0....
06 Dec 2010 - by Riccardo Pravettoni
Areas that qualify for protection under Indonesian law
Under Indonesian law, areas that qualify for protection are based on slope (>40%), sensitive soil types, elevation (above 2000m), and peat land (>3m), thereby preventing any man-made development within most of the Sumatr...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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