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GIS Map Application BOD in rivers
The map shows the mean annual value of BOD observed in river monitoring stations since 1993, reported by EEA member countries via WISE. BOD (Biological Oxygen Demand or Biochemical Oxygen Demand) is the amount of dissolved oxygen, expressed in milligrams of oxygen per litre of water, consumed by micro-organisms to decompose the organic matter present in water. BOD is commonly reported as BOD5, the amount of oxygen consumed over a 5-day period of incubation. Some countries report BOD7, the amount of oxygen consumed over a 7-day period. For comparability, the values of BOD7 are converted to BOD5 (BOD7 = 1.16 BOD5). Large quantities of organic matter (microbes and decaying organic waste) in water are a potential risk to aquatic ecosystems and human health. The reduction in the amount of dissolved oxygen as a result of the decomposition of organic matter can endanger aquatic life through asphyxiation and disrupt the ecological balance of the water. Organic matter can also pollute drinking water and bathing water. High levels of BOD can indicate such organic pollution. The purpose of the map is to provide an overview of the mean annual value of BOD in rivers across Europe and to enable the user to compare values per country, River Basin District (RBD) or individual monitoring station, depending on the scale of visualisation. Historical data since 1992 can be displayed using the time slider.
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Figure BOD5 and total ammonium concentrations in rivers between 1992 and 2005
Number of river monitoring stations included in analysis noted in brackets
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Figure BOD5 concentrations in rivers between 2001 and 2006 in European countries
Number of river monitoring stations included in analysis noted in brackets
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Figure BOD5 concentrations in rivers between 1992 and 2009 draining to different sea regions of Europe
Geographical coverage: Baltic Sea, Black Sea, Celtic Seas, Bay of Biscay, Iberian Cost, Greater North Sea, Mediterranean Sea.
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Figure BOD5 concentrations in rivers between 1992 and 2011 draining to different sea regions of Europe
The sea region data series are calculated as the average of annual mean data from river monitoring stations in each sea region. The data thus represents rivers or river basins draining into that particular sea. Only complete series after inter/extrapolation are included (see indicator specification). The number of river monitoring stations included per sea region is given in parentheses. There were no stations with consistent data series on BOD7 in rivers draining to the Arctic Ocean. BOD7 data has been recalculated into BOD5 data.
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Figure BOD5 concentrations in rivers between 1992 and 2010 draining to different sea regions of Europe
The sea region data series are calculated as the average of annual mean data from river monitoring stations in each sea region. The data thus represents rivers or river basins draining into that particular sea. Only complete series after inter/extrapolation are included (see indicator specification). The number of river monitoring stations included per sea region is given in parentheses. There were no stations with consistent data series on BOD7 in rivers draining to the Arctic Ocean. BOD7 data has been recalculated into BOD5 data.
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Figure BOD5 concentrations in rivers between 1992 and 2005 in different regions of Europe
Number of river monitoring stations included in analysis noted in brackets
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Figure BOD5 concentrations in rivers between 1992 and 2006 in different regions of Europe
Number of river monitoring stations included in analysis noted in brackets
Located in Data and maps Maps and graphs
Figure BOD5 concentrations in rivers between 1992 and 2010 in different geographical regions of Europe
The data series per region are calculated as the average of the annual mean for river monitoring stations in the region. Only complete series after inter/extrapolation are included (see indicator specification). The number of river monitoring stations included per geographical region is given in parentheses. BOD7 data has been recalculated into BOD5 data.
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Figure BOD5 concentrations in rivers between 1992 and 2008 in different sea regions of Europe
Geographical coverage: Atlantic Ocean, Baltic Sea, Black Sea, Mediterranean Sea and the North Sea.
Located in Data and maps Maps and graphs
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100