Assessment of groundwater chemical status based on aggregated data from a monitoring network exemplified in a river drainage basin

Ewa Kmiecik; Monika Stach-Kalarus; Jadwiga Szczepańska; Irena Twardowska; Sebastian Stefaniak; Krystyna Janta-Koszuta

doi:10.1117/12.686367

17 October 2006 Assessment of groundwater chemical status based on aggregated data from a monitoring network exemplified in a river drainage basin

Ewa Kmiecik, Monika Stach-Kalarus, Jadwiga Szczepańska, Irena Twardowska, Sebastian Stefaniak, Krystyna Janta-Koszuta

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Proceedings Volume 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV; 63770M (2006) https://doi.org/10.1117/12.686367
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

According to the EU Water Framework Directive 2000/60/EU (WFD, 2000), water quality should be compulsory assessed for all bodies of usable groundwater basins (GWB). The assessment has to be accomplished in two stages: (i) preliminary assessment for identification of GWBs of poor or unsatisfactorily elucidated water quality; (ii) detailed assessment for GWBs that do not fulfill the good chemical status criteria. If this analysis confirms poor quality of ground waters, they should be subjected to a monitoring in order to found out the cause of a threat and ways of its interception. Both FWD and the draft EU Directive on the protection of groundwater against pollution (GWD, 2004) distinguish only poor or good chemical status of water, while GWD comprises a list of chemical constituents, for which the EU Member States should develop uniform threshold values by the end of 2006. The chemical status of groundwater in the selected Koprzywianka River drainage basin was evaluated within the 6FP BRIDGE project aimed at realization of this task on the basis of 37-point monitoring network with use of both national (RMS, 2004) and European (GWD, 2004) chemical parameter lists. These data were used for point and spatial evaluation of groundwater chemical status. For spatial evaluation (drainage basin and particular GWBs), the data aggregated by mean and median methods were used. The results show a better precision of groundwater status assessment both by point and spatial methods, and a need of a careful selection of monitoring points separately for shallow and deep circulation. It has been proved that the spatial assessment should be carried out on the basis of median, and not mean concentrations recommended by GWD (2004), as chemical constituents in ground waters usually display a log-normal distribution that is not susceptible to deformation to such extent as mean values.

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Ewa Kmiecik, Monika Stach-Kalarus, Jadwiga Szczepańska, Irena Twardowska, Sebastian Stefaniak, and Krystyna Janta-Koszuta "Assessment of groundwater chemical status based on aggregated data from a monitoring network exemplified in a river drainage basin", Proc. SPIE 6377, Advanced Environmental, Chemical, and Biological Sensing Technologies IV, 63770M (17 October 2006); https://doi.org/10.1117/12.686367

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