Hydrological Effect on the Chemical Status of Groundwater

Nataša Sovič^a*, Goran Vižintin^b, Venčeslav Lapajne^a and Miran Veselič^c
a Institute of Public Health Maribor, Institute of Environmental Protection, Prvomajska 1, 2000 Maribor, Slovenia.
Tel. +386 (2) 4500 100, Fax: +386 (2) 45 00 227, E-mail: natasa.sovic@zzv-mb.si
^b Faculty of Natural Science and Engineering, University of Ljubljana, A{ker~eva 12, 1000 Ljubljana, Slovenia.
Tel +386 41 605 940, Fax: +386 (1) 4704 500, E-mail: goran.vizintin@guest.arnes.si
^c Agency for Radwaste Management, Parmova 53, 1000 Ljubljana,
Tel +386 1 236 32 30 Fax.:+386 (1) 2363 200, E-mail:miran.veselic@gov.si

Abstract
Different Institutions carried out several monitorings of groundwater quality within the Ljubljana area. Our objectives were to collect data from different programmes and use them for modelling. The groundwater flow and mass transport models were constructed with the help of geohydrological and geophysical information using, Modflow software. By taking the hydrological characteristics of Ljubljansko polje into account, we developed spatial maps showing expected values for electrical conductivity, nitrate, atrazine, and chromium. We investigated areas strongly influenced by the River Sava, areas with high levels of vulnerability and numerous sampling places, and which are not representative of this area. We determined trends for nitrate, atrazine and chromium. Analyses over several years have indicated that sooner or later, the diversity of pollution in Ljubljansko polje could be measured at the Hrastje site.

Keywords: Groundwater, water quality, hydrology, Ljubljansko polje