River basin specific pollutants are substances that enter the river basin or parts of it in significant quantities. The quantitative assessment is done with environmental quality standards that are fixed by the European Union member states. In Luxembourg, the substances and limit values (annual average) are fixed in the grand ducal regulation of 15 January 2016 (règlement grand-ducal du 15 janvier 2016 concernant l'évaluation des masses d'eau de surface). Evaluation takes place with 2 categories (good, moderate and worse). River basin specific pollutants are used together with the general physico-chemical parameters for evaluation of the ecological status.

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.

Earthworks

The chemical status of the groundwater bodies is assessed as being good or failing to achieve good chemical status. The assessment of the chemical status for the third river basin management plan is based on the list of substances of directive 2008/105/EC as well as its environmental quality standards.

The WFD's (2000/60/CE) quantitative status objectives aim to ensure a balance between groundwater withdrawal and recharge.

The overall evaluation of the biological status per surface water body is based on the evaluation of the biological quality elements (BQE) : phytoplantcon, aquatic flora, macroinvertebrates an fish. In order to determine the overall evaluation of the biological status per surface water body the worst status assessed by the different biological quality elements ist retained („One out - all out“ principle).

Construction restrictions in groundwater protection zones. For more details, please refer to the following links: Grand-Ducal Regulation of July 9, 2013 (http://legilux.public.lu/eli/etat/leg/rgd/2013/07/09/n20/jo) Specific grand-ducal regulations creating groundwater protection zones (https://eau.gouvernement.lu/fr/administration/Legislation/Reglements-grand-ducaux-portant-creation-de-zone-de-protection.html)

Layer showing the intensity of a modeled 100-year flood event. The intensity of a flood event depends on the water depth and the discharge.

Layer showing the intensity of a modeled 10-year flood event. The intensity of a flood event depends on the water depth and the discharge.

These are buildings that are crossing the rivers (data available for the fifteen TIMIS rivers).