The paper describes the main point sources of groundwater pollution in the Lower Váh River flood plain in the zone of influence of the designed waterwork Sereď-Hlohovec. These are the sludge beds of the Wire Mill Hlohovec and the industrial waste of nickel production (futher only waste) depot near Sereď town. The plumes of propagation of representatives of non-adsorbing dissolved matters in ground water - chlorides and nitrates - were acquired by simulation by means of transport models created by the MT3D code. The forecasts of pollutant propagation assuming steady ground water flow were elaborated for the derivation variant of the designed waterwork and for the so-called do-nothing variant, i.e. the forecasted water regime of the territory in case the waterwork is not built. As chlorides are leaking from the sludge bed of the Wire Mill Hlohovec, j.s.c. and assuming that their concentration will remain as high as at present, the possibility of direct manifestations of ground water quality deterioration in the surrounding of the sludge bed has to be reckoned with if the waterwork is built and operated but also in the event that the waterwork will not be built at all. Similarly, we may state that the leakage of nitrates from the waste depot will result in the deterioration of water quality in the surroundings and that the pollution will spread towards Galanta town and Gáň. By comparing the plumes of pollutant propagation and concentration we found out, that the Sereď-Hlohovec waterwork will affect neither the direction of propagation, nor the concentration of nitrates leaking from the waste depot near Sereď. and V príspevku sú opísané hlavné bodové zdroje znečisťovania podzemnej vody v poriečnej nive dolného Váhu v zóně vplyvu navrhovaného vodného diela Sereď-Hlohovec, ktorými sú kalové pole Drôtovne a.s., Hlohovec a skládka luženca blízko Seredě. Pomocou matematického transportného programu MT3D boli získané jazyky šírenia koncentrácie reprezentantou neadsorbujúcich rozpustených látok v podzemnej vode - chloridov a dusičnanov. Prognózy šírenia kontaminantov za predpokladu ustáleného stavu prúdenia podzemnej vody boli vypracované pre derivačný variant navrhovaného vodného diela a pre tzv. nulový variant, t.j. prognózovaný vodný režim územia, ak by sa stavba vodného diela nerealizovala. Pri existencii únikov chloridov z kalového poľa Drôtovne a.s., Hlohovec a za predpokladu, že ich koncentrácia bude rovnako vysoká ako je v súčasnosti, treba počítať s možnosťou priamych prejavov zhoršovania sa kvality podzemnej vody v okolí kalového poľa, a to v prípade výstavby a prevádzky vodného diela, ale aj v prípade, že sa vodné dielo stavať nebude. Podobne možno konštatovať, že pri únikoch dusičnanov z okolia skládky luženca pri Seredi bude docházať k zhoršovania kvality podzemných vôd v blízkom okolí a jazyk znečistenia bude postupovať smerom na Galantu a Gáň. Porovnaním jazykov šírenia kontaminantu a jeho koncentrácie bolo zistené, že vodné dielo Sereď-Hlohovec nebude mať vplyv ani na smer pohybu ani na koncentráciu dusičnanov šíriacich sa z okolia skládky luženca.
Soil sorptivity is considered a key parameter describing early stages of water (rain) infiltration into a relatively dry soil and it is related to build-up complexity of the capillary system and soil wettability (contact angles of soil pore walls). During the last decade an increasing water repellency of sandy soils under pine forest and grassland vegetation has been frequently observed at Mlaky II location in SW Slovakia. The dry seasons result in uneven wetting of soil and up to hundredfold decrease in soil sorptivity in these vegetated soil as compared to reference sandy material, which was out of the reach of ambient vegetation and therefore readily wettable. As far as water binding to low moisture soils is governed by adsorption processes, we hypothesized that soil water repellency detected by water drop penetration test and by index of water repellency should also influence the water vapour adsorption parameters (monolayer water content, Wm, specific surface area, A, maximum adsorption water, Wa, maximum hygroscopic water MH, fractal dimension, DS and adsorption energies, Ea) derived from BET model of adsorption isotherms. We found however, that the connection of these parameters to water repellency level is difficult to interpret; nevertheless the centres with higher adsorption energy prevailed evidently in wettable materials. The water repellent forest and grassland soils reached less than 80% of the adsorption energy measured on wettable reference material. To get more conclusive results, which would not be influenced by small but still present variability of field materials, commercially available homogeneous siliceous sand was artificially hydrophobized and studied in the same way, as were the field materials. This extremely water repellent material had two-times lower surface area, very low fractal dimension (close to 2) and substantially lower adsorption energy as compared to the same siliceous sand when not hydrophobized.