Rivers and lakes
with a poor water quality have a lower species diversity than clean
water courses. The indicator shows how the water quality of water
courses and captive water is developing.
It has deliberately been defined in broad terms to
avoid a commitment to investigating specific parameters.
Since the problematic substances in watercourses will not always
be the same ones, the data that need to be reported for this indicator
can be selected to reflect the potentially hazardous substances
that are currently giving cause for concern. At the moment, for
example, the focus is on all compounds containing nitrogen and phosphorus.
Apart from potentially hazardous substances, the current rise in
the water temperature is a very important aspect.
A reduction in the chemical burden in the water and in the water
temperature must be evaluated as positive.
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