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Tag: Water quality

Population using improved water sources in Tanzania
The proportion of people in urban areas who use drinking water from improved sources has increased to 83 per cent in 2008, from 68 per cent in 1990 (Government of Tanzania 2008). While more than 80 per cent of people liv...
14 Oct 2013 - by GRID-Arendal
Water quality in Macedonia
Shows various levels of water quality in the major rivers of Macedonia. If we analyze natural conditions in the country, we shall conclude that Macedonia is a semi-dry area (the area of Ovce Pole is the driest one in the...
11 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Potential impact of sea level rise: Nile Delta
Rising sea level would destroy weak parts of the sand belt, which is essential for the protection of lagoons and the low-lying reclaimed lands in the Nile delta of Egypt (Mediterranean Sea). The impacts would be very ser...
17 May 2005 - by Otto Simonett, UNEP/GRID-Arendal
Discharge of selected pollutants
Nitrogen and phosphorous represents nutrients that can be seen as pollutants, as large concentations of those increase eutrophication. Nutrients are present in primarily commercial fertilisers and in sewage. A measure of...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Nile Delta: Potential Impact of Sea Level Rise
The potential impacts of sea level rise on the Nile Delta are expected to include a decline in water quality that would affect freshwater fish, the flooding of agricultural land and damage to infrastructure. This graphic...
12 Feb 2006 - by Otto Simonett, UNEP/GRID-Arendal
Water issues in the Ferghana Valley
Water is a basic production resource for agriculture. Competition for scarce water resources has been recognized as a potential source of international conflict. In the case of the Ferghana Valley, despite the very local...
16 Mar 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Nile Delta: Potential Impact of Sea Level Rise
The potential impacts of sea level rise on the Nile Delta are expected to include a decline in water quality that would affect freshwater fish, the flooding of agricultural land and damage to infrastructure. This graphic...
17 May 2005 - by Otto Simonett, UNEP/GRID-Arendal
Biological oxygen demand - BOD: 1976-2008
The availability of oxygen is one of the most important indicators of the condition of a water body, because dissolved oxygen, or DO, (the amount of oxygen dissolved in water) is necessary for most aquatic organisms, inc...
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
Access to sanitation in Yaoundè
Proper disposal of sewage is essential for urban water quality, and in Yaoundè the treatment of wastewater, excreta, and sewage can be classified into two categories – individual wastewater systems (septic tanks and latr...
18 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal