Phytoplancon is one of the 4 biological quality elements (BQE) for the assessment of the ecological status of the natural water bodies. The evaluation of this BQE is only relevant for the wide rivers where the quantity of phytoplankton is significant and can be evaluated. The natural water bodies of typology VI present significant phytoplankton concentrations to allow an assessment. Some of the heavy modified waterbodies (HMWB) present significant phytoplankton concentrations too, these are the HMWB Sûre (WB III-2.2.1) and the HMWB Our (WB V-1.2). The annual frequency for phytoplankton monitoring is 6 samples between April and October.
Description copied from [catalog.inspire.geoportail.lu](https://catalog.inspire.geoportail.lu/geonetwork/srv/eng/catalog.search#/metadata/a2f5e2ad-fa9a-45c9-8129-b1e9f7e257a7).
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