HVD - Annex 2 Earth Observation and Environment - Water - Phytoplankton (2015 - 2021)

The ecological status of the natural waterbodies is assessed in 5 classes going from 1 to 5 (high, good, moderate, poor, bad). The classification of the ecological status is based on the biological quality elements, physico-chemical quality elements and in some cases also the hydromorphological quality elements. For more information : https://eau.gouvernement.lu/fr/administration/directives/Directive-cadre-sur-leau/2e-cycle-(2015-2021).html

Evaluation of the quality element “morphological conditions” per surface water body. For more information : https://eau.gouvernement.lu/fr/administration/directives/Directive-cadre-sur-leau/2e-cycle-(2015-2021).html

Evaluation of the quality element “continuity” per surface water body. For more information : https://eau.gouvernement.lu/fr/administration/directives/Directive-cadre-sur-leau/2e-cycle-(2015-2021).html

The macroinvertebrates are sampled according to the French method IBGN ( indice biologique global normalisé , agences de l' eau 2000). The results allow to classify the surface water bodies into 5 classes : high - good - moderate - poor - bad. Macroinvertebrates are sensitive to the hydromorphology, organic pollution , biological continuity , water regime and acidification. The Macroinvertebrates are one out of four biological parameters of the ecological status of surface water. For more information : https://eau.gouvernement.lu/fr/administration/directives/Directive-cadre-sur-leau/2e-cycle-(2015-2021).html

The "good ecological potential" is the environmental quality objective defined by the water framework directive for artificial and heavily modified surface water bodies. The ecological potential is assessed in four classes ranging from 1 to 4 (good and higher, moderate, poor, bad). The classification of the ecological potential is based on the biological, physico-chemical and in some cases also the hydromorphological quality elements. For more information : https://eau.gouvernement.lu/fr/administration/directives/Directive-cadre-sur-leau/2e-cycle-(2015-2021).html

The surface water typology was determined on the basis of geographical , geological, morphological and hydrological characteristics. The Luxembourgish surface water typology comprises six types. For all six types the reference conditions, which would be achieved if there were no anthropogenic pressures impacting surface waters, are described in fact sheets. The reference conditions correspond to the high status of surface water bodies.