Modelling of base flow of the basin of Kolubara river in Serbia

This study presents a physically founded hydrologic–hydraulical model for determining the base flow of the catchment by analysing the water balance of the basin and vertical exchange of water between the atmosphere, unsaturated media and ground water, basing on the known physical characteristics of the basin (climatic, paedological, geological and vegetation ones) on the example of the 340 km2 Kolubara River basin up to “Valjevo” water level monitoring station in Serbia in three characteristic years: an extremely rainy year (1970), an average year (1985) and an extremely dry year (1990).