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Figure Areas of seasonal hypoxia (oxygen deficiency) and anoxia (no oxygen) in the
Located in Data and maps Maps and graphs
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.
Located in Data and maps Interactive maps
Figure Concentrations of total ammonium, biochemical oxygen demand, nitrate and orthophosphate in European rivers between 1992 and 2002
Concentrations are average of the annual average concentrations per year
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Figure Development of aquatic community and oxygen concentration of the Rhine at Bimmen
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Figure Reference Waterbase - Monitoring stations for rivers and lakes
Water quality monitoring stations in rivers and lakes
Located in Data and maps Maps and graphs
Figure Reference Waterbase - Monitoring stations for rivers and lakes
Water quality monitoring stations in rivers and lakes
Located in Data and maps Maps and graphs
Figure Reference Waterbase - Monitoring stations for rivers and lakes
Water quality monitoring stations in rivers and lakes
Located in Data and maps Maps and graphs
Figure Trend in total ammonium (NH4) concentrations and BOD5 in selected WCE rivers (1992-2004)
Numbers of river monitoring stations in brackets
Located in Data and maps Maps and graphs
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100