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Water quality. Biological classification of rivers - Guidance on the interpretation of biological quality data from surveys of benthic macroinvertebrates Ingestion-build-59651 which are closely linked to1 Scope This part of ISO 8689 gives guidance on the interpretation of biological quality data relating to running waters from surveys of benthic macroinvertebrates. It is recognized that for a complete assessment of ecological status, other elements of biological quality should be assessed. NOTE Annex A gives guidance on how the comparison of the various classification systems can be made where classifications of the biological quality of running