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Tag: Surface water

Surface circulation in the Mediterranean Sea
The large-scale circulation of the Mediterranean Sea has been described as sub-basin-scale and mesoscale gyres interconnected and bounded by currents and jets with strong seasonal and inter-annual variability (Millot a...
19 Nov 2013 - by GRID-Arendal
Groundwater contamination from canals - Hat Yai, Thailand
In areas where surface water is not readily available (located far away from areas where it is needed), groundwater is the primary water source. This graphic shows the chloride concentration and the potassium concentrati...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
Unsustainable water withdrawals for irrigation
The imbalance in long-term water budgets necessitates diversion of surface water or the tapping of groundwater resources. The areas shown with moderate-to-high levels of unsustainable use occur over each continent and ar...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Many of the largest rivers in the Himalayas Hindu Kush region are strongly dependent upon snow and glacial melt for waterflow
Except for the fact that glaciers are melting rapidly in many places, we do not have adequate data to more accurately project when and where water scarcity will affect irrigation schemes in full. Making accurate projecti...
02 Feb 2009 - by Ieva Rucevska, UNEP/GRID-Arendal
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
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