Case Studies





Fostering the use of models to plan programs of measures (POM) in the WFD implementation is one of the main goals of the M3 project. Care has been taken to address pressures where knowledge gaps are the biggest in the M3 partner regions and where model application seemed to be prohibitive because of complexity of the processes described and the input data needed. In practice these pressures are often ignored or just named without fixing any quantitative goals and hence POM remain vague and operationally weak. An important aspect of implementing such models is the establishment of a sound and pragmatic monitoring campaign that will allow validating the simulations. In that respect, M3’s monitoring tools have been chosen in order to fulfill the data needs for verifying model outputs.

In Luxembourg two case-studies have been chosen to address two pressures that are currently neglected in impact assessment: Pesticides are ubiquitous in most surface waters with very dynamic concentrations following season or hydrologic situation. The assessment of the dynamic immission situation for these components in all water bodies via monitoring is impracticable. Hence there’s a need for models that are able to simulate the exposure of the river biota to pesticides over a season. The catchment of the Wark, a hilly agricultural region with low permeability soils, has been chosen as a case study for pesticides in Luxembourg. Another important pressure is storm water emissions in urban settings. Here, the focus rests on substances that have a high affinity for solids and hence have longer residence times in river beds and different uptake routes for biota. Polycyclic Aromatic Hydrocarbons (PAH) and several metals are ubiquitous substances from storm water sources, whose dynamics and impacts are rarely addressed in an appropriate manner. This pressure type will be addressed in Luxembourg in the Mamer catchment.

The Swist catchment has been chosen by the Erftverband as a case-study where urban wastewater management and emissions from orchards are in the focus.

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