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Pesticides in european groundwaters : detailed study of representative aquifers and simulation of possible evolution scenarios

Obiettivo

Problems to be solved
Pesticide concentrations above the 0.1 µg/L drinking water limit have been reported in many groundwater (GW) used for drinking water supplies in Europe. Questions as why it happens and how it will evolve in the near and distant future cannot be answered at the moment. Because the GW is used extensively for drinking water purposes, this is a problem of true European dimension. PEGASE will focus on delivering performance-assessed tools to predict the possible evolution of GW contamination by pesticides at the aquifer scale and to assess the socio-economic implications of alternative scenarios aiming at GW quality restoration or protection. An improved knowledge of the relative importance of processes involved in pesticide transport to and in the GW of representative aquifers will benefit the harmonized regulatory procedure and eventually lead to reductions in environmental deterioration, benefiting the community at local, regional, national and international levels. The work to be conducted through PEGASE will complement European policy objectives by providing tools that will help in implementing the Member States policies across Europe by both legislators and stakeholders.
Scientific objectives and approach
The global objective of PEGASE is to enable predictive modelling of pesticide contamination of representative European aquifers, and assessment of socio-economic implications of the present and future contamination. Specific objectives and innovations are the:
· Production of high quality data sets with intensive (36 monthly samplings) and extensive (land use, pesticide applications, soil, vadose zone and aquifer characteristics) monitoring of aquifers ranging from a 1 hectare area of a sandy aquifer with GW table < 2 m bgl to a karst aquifer with GW > 10 m bgl.
· Development of mechanistic and semi-empirical tools dedicated to the specialized modelling of pesticide contamination of GW, with
i) operating links between root zone models and aquifer models,
ii) consideration of non-equilibrium phenomena, and
iii) incorporation of uncertainties associated with the field data and the results from transport models.
· Performance assessment of those tools using the data of the first 24 months monitoring for calibration, and assessing the predictive capacity (extrapolation step) by comparing predicted GW levels and pesticide concentrations with the values of the third hydrological cycle monitored.
· Socio-economic assessment of alternative scenarios including changes in land use and agricultural practices aiming at GW quality restoration or protection in a context of sustainable development.
Expected impacts
A better understanding of how pesticide concentrations in GW are most likely to evolve over time (a key objective of PEGASE project) will enable a more cost-effective configuration of the treatment plants and result in a cheaper water supply for consumers, thereby yielding considerable benefits to end-users of GW resources. The knowledge provided by PEGASE will also help avoid very restrictive land practices to be recommended or imposed that would not take account of site-specific conditions (e.g. a particularly slow GW recharge, or long transit time of the water flux trough a very thick unsaturated zone). Finally, by identifying areas least at risk for GW pesticide contamination, PEGASE will enable the available financial resources to be allocated to the most vulnerable areas, thus maximizing the improvement the society may expect from its limited financial and natural resources. All stakeholders will be associated with the socio-economic work in PEGASE, ensuring the choice of scenarios that may possibly be implemented and a true assessment of their direct and indirect environmental implications.

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Coordinatore

Bureau de Recherches Géologiques et Minières
Contributo UE
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Indirizzo
Avenue Claude Guillemin 3
45060 ORLEANS
Francia

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