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3.1.3. Confidence in classification of ecological status or potential in different countries
Most member states have classified all their water bodies (figure 3.3), although a few countries have a substantial proportion of water bodies that are delineated, but not classified. At the EU level 86% of a total of 103663 river and lake water bodies are classified, while 76% of a total of 3764 transitional and coastal water bodies are classified. The member states with a substantial proportion of unclassified water bodies for rivers and lakes are Poland (79%), Finland (54%), Italy (48%), Hungary (39%), Greece (38%), Cyprus (23%) and Spain (22%), while for transitional and coastal waters only three countries have a substantial proportion of unclassified water bodies: Italy (90%), Ireland (66%) and the Netherlands (25%).
The reasons for not classifying all water bodies are unclear, but may be related to low confidence or gaps in assessment systems for certain quality elements or certain types of water bodies.
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For Poland the reason was that only monitored WB had been classified (i.e. no extrapolation and no expert judgement had been used).
Slovenia
Confidence level of the ecological status (rivers and lakes)
Biological quality elements and general physico-chemical parameters
The criteria for the confidence level are divided into basic and additional. The basic criteria are mutually equivalent, additional criteria may have reduced the confidence level, determined using basic criteria.
For all biological elements the criteria for determining confidentiality levels were the same. The basic criteria were: intercalibration of classification methods, the number of samples and the range of ecological quality conditions within a given water body. On the basis of additional criteria, the level of confidence, e.g. decreased if the calculated value of the ecological quality ratio (EQR) deviated from the ecological quality class boundary ≤ 0.05.
The most important criteria for determining the confidence level for supportive general physico-chemical elements of the rivers were the number and considered collecting period of the data and analythical uncertainty. In lakes, the general physico-chemical parameter (the oxygen concentration in the hypolimnion) as a criterion based solely on the number of data.
(gorazd.urbanic@izvrs.si)