My diploma thesis is based on an analysis of hydrological stations in the Mengeš-Domžale Plain, in which I look at information about extreme levels of groundwater. I focused on the hydrological stations located in the flat area along the Kamniška Bistrica stream. The following hydrological stations were observed: Loka (1471), Mengeš 3 (Mp-0275), Mengeš 4 (0420), Podgorica (1992), Podgorje (0100), Preserje (0430), Študa (1752) and Zgornje Jarše 2 (D-0582). The data were obtained from the website of the Slovenian Environ-ment Agency. The minimum and maximum groundwater levels are presented in separate diagrams for each hydrological station. For each of the analyzed hydrological stations and for each data set, the linear trend for the period be-tween 1981 and 2013 was calculated. Based on the analyzed diagrams, I es-tablished a decreasing trend of groundwater levels at almost all stations, ex-cept for Loka (1471) and Preserje (0430) where there was an increasing trend for minimum groundwater level. The trend of decreasing groundwater levels in the Mengeš-Domžale Plain is generally observed throughout the analyzed area. In the central part of the Mengeš-Domžale Plain, the decrease was rela-tively high owing to the fact that the area has many pumping stations and is the most populated one, which consequentially means less infiltration in aquifers. The southern part of the analyzed area saw the biggest decrease in groundwater level: by as much as 2 meters. Ostensibly, the reason is the deepening of the riverbed of the Sava, into which groundwater from the Mengeš-Domžale Plain flows.
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