Rate of change in rivers classified as less than good as a percentage of the total river classified. Data shown is for different types of classification scheme, by country

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 29 Nov 2012, 11:39 AM
Different types of schemes cannot really be compared hence the graph is divided into the classification types used (biological, physico-chemical, combined)


European data


Additional information

Some countries have more than 1 national classification scheme and so results for each scheme are shown separately e.g. England and Wales has a chemical scheme and a biological scheme. This separation into types of scheme also illustrates that whilst one scheme may show an improvement in quality, another may show a deterioration e.g. The Northern Ireland chemical scheme showed an improvement whilst the biological scheme showed a deterioration.

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