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(radioactivity, activity concentration, 40K groundwater, Serbia)
occurrence of carbonated groundwater (MARINKOVIĆ et al. 2012). This groundwater also exhibits naturally elevated radioactivity. ConclusionIn this paper the distribution of natural radioactivity of groundwater from the territory

water originates from these rocks (PROTIĆ 1995).Groundwater occurrences mark different regional geological-structural features and the largest number ofmineral groundwater is related to the granite intrusions and volcanic

samples that exhibited elevated betaactivity concentrations belonged to the Na-HCO3 typeof groundwater, suggesting that the groundwater tracedto an aquifer in granitoid rocks with elevated concentrations of dissolved solids

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(flotation tailings dump, alluvium, groundwater pollutuon, Serbia)
the alluvial plain of the Ibar River. Due to the excellent groundwater flow characteristics ofthe alluvial formations underlying the tailings dump, the groundwater and soil over an extended area werecontinually polluted. High

theRudnik Creek and the IbarRiver relative to the groundwater level.MethodsIn order to determine theimpact of the flotation tailingin Veliko Polje on the surrounding soil and groundwater,laboratory tests of the substrateenvironment

of Belgrade).Groundwater was sampledfrom privately dug wells, the levels of which areshown in Fig. 3. The samples were taken at the end ofautumn when the level of the Ibar River was lowerthan the groundwater level, shown

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(magnesium, groundwater, distribution, Mg/Ca ratio, Serbia)
ground in which the groundwater isformed, as well as the type of groundwater and theTDS level, given that the concentration of this ion ishigher in high-TDS than in low-TDS groundwater,such that this groundwater is not of a pure

TODOROVIĆ88Fig. 5. Magnesium-to-calcium ratio of groundwater. Legend: I, Groundwater formedin limestones; II, Groundwater associated with dolomites and dolomitic limestones;III, Groundwater tracing to magnesium-rich silicate rocks

into two groups: (1) groundwater occurrences whose Mg concentrations are from 50 to 70 mg/LDistribution of magnesium in groundwater of Serbia 87Fig. 4. Distribution of magnesium in Serbia’s groundwater resources. Legend: 1

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(subgeothermal, groundwater, heat pump, energy efficiency, eastern Serbia)
cal heterogeneity and a variety in aquifer systems and groundwater distribution. Thus, the region ischaracterized by the presence of formations withsmall groundwater reserves but also Mesozoic carbonate rocks, Tertiary or

longtime to come. There is also good potential for groundwater utilization from alluvial sediments and Neogeneformations in Intra-Carpathian basins. Regarding thetotal groundwater resources available there are somecontradictions

ConclusionsAmong the main advantages of subgeothermalenergy extraction from groundwater (temperature30°C or less) are:• Easy tapping (once the groundwater resource isproperly explored and defined);• Renewable energy resource which

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(factor analysis, hydrogeochemical processes, groundwater, factor loadings, Serbia)
similarities between samples (i.e. groundwater occurrences).The goal of multivariate statistical methods is to identify the hydrogeochemical processes that govern theformation of groundwater composition. If the geological and

factor analysis in identification of dominant hydrogeochemical processes of groundwater 59Table 1. Elementary statistical quantities for the 40 groundwater samples.Table 2. Factor loadings and percentage of variance explained by

GHEBREMICHAEL, K., BUAMAH, R. & AMY, G. 2011. Fluoride occurrence in groundwater in the Northern region of Ghana, Proceedings ofIWA Specialist Groundwater Conference in Belgrade,267–275.STEVENS, J.P. 1992. Applied multivariate

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(monitoring, groundwater, good status, EU Water Framework Directive, Serbia)
controlling groundwater quality. Currently only 20% of delineated groundwater bodies are under observation. This paper evaluates current conditions and proposes to expand national monitoring network to covermost of groundwater bodies

sediments, and groundwater isfrequently loaded with organic substances and ammonia, occasionally, also arsenic or boron. Although large groundwater consumer Serbia is notproperly organizes monitoring of groundwater qualityand

the Designation of Surface Water and Groundwater Bodies inorder to conserve or achieve good ecological, chemicaland quantitative status of groundwater resources. Abody of groundwater designated within a geologicalformation

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thesame groundwater source. The effect of the extent ofriverbed colmation and the filtration parameters of theinterbed were assessed, using a hydrodynamic modelof the groundwater in the pertinent part of the groundwater source

PUŠIĆ2Abstract. The outcomes of a study on groundwater flow from a river to a radial collector well are presented in the paper. The considered well, RB-16, is part of a groundwater source that provides water supply toBelgrade

this particular purpose. Key words: groundwater, anoxic conditions, rate of horizontal screen incrustation, new approach, definition of well elements, numerical modeling of groundwater, public water supply, Serbia.Апстракт

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(groundwater regime, catchment area, real evapotranspiration, dynamic volume, water budget, Belo Vrelo, Serbia)
streams. In the case of fracture porosity,groundwater pathways are determined by the geological formation, extent of fracturing and local hydrogeological conditions. At Belo Vrelo, groundwater circulates within faults, fractures

the hydrogeological characteristics of the area, the qualitative andquantitative characteristics of the groundwater, andthe variations in these parameters over time. Theaquifer regime is governed by a series of factors,

of transformation of precipitation into a discharge hydrograph. It isalso possible to determine dynamic groundwater volumes in a karst spring catchment area, the water budgetequation parameters and the like. It should be