According to the water framework directive (Directive 2000/60/CE), the biological parameter fish are monitored in surface water bodies in order to determine the ecological status. Fish react sensitively to the continuity and the hydrological flow of surface water. Fish are therefor sampled in the SWB which have deficits here. The methodology applied for sampling is the standard NF EN 14962:2006 "water quality − guidance on the scope and selection of fish sampling methods".

The concept of aquatic habitat connectivity is based on the migration of aquatic species from habitats presenting favorable local conditions to habitats presenting less favorable habitats. Based on the structural quality mapping carried out in 2013-2014 and the planning conditions and restrictions, the watercourse network of the luxemburgish surface water bodies was divided into six categories of functional elements.

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.

The geostatistical interpolation map shows in real time the most probable distribution of the pollutant fine particles (PM10) between the different fixed measurement points that make up the telemetric network of Luxembourg, this at a resolution of 1km2.

Luxembourg's surface water bodies have been grouped into so-called "study zones", which essentially correspond to the country's major catchment areas. Seven study zones have been designated in total.

A medium combustion plant is any technical device with a rated thermal input of 1 MW or more and less than 50 MW in which combustible products are oxidised in order to use the heat thus produced, such as combustion plants, engines and gas turbines. All medium combustion installations must be registered with the Environmental Administration, which keeps a public register with information on each installation. The operating conditions and the obligations of the operators of these installations are laid down in the Grand-Ducal Regulation of 24 April 2018 on the limitation of emissions from medium combustion installations.

Décharges déchets ménagers

The groundwater bodies are classified according to 6 states: no data available, very good, good, moderate, unsatisfactory, bad.

The chemical status of the surface water bodies is assessed as being good or failing to achieve good chemical status. The assessment of the chemical status for the second river basin management plan is based on the list of substances of directive 2008/105/EC and the environmental quality standards established by the new directive 2013/39/EC.

In the detailed programme of measures, the types of measures related to hydromorphology (HY) and urban wastewater management (SWW) which are defined in the catalogue of measures of the second river basin management plan, were assigned to the individual water bodies. The objective of this assignation is to identify for each water body those measures that will help to reduce the pressures and deficits present in the water body, thereby improving its status or maintaining its good status. The hydromorphological measures include the improvement of the ecological continuity, the renaturation of water courses as well as the regulation of the minimal flow. Some hydromorphological types of measures can have a positive effect on the reduction of floods.