The diploma work deals with data on discharge in the drainage adit of the Boršt hydrometallurgical waste repository and their comparison with precipitation. The drainage adit was constructed in 1995 under the land slide in order to lower groundwater level and stop the landslide. Due to the additional drainage of groundwater, four drainage chambers with a number of wells have been built in the tunnel since 2010. In all drainage wells and in the drainage chambers red and gray-green conglomerates, sandstones and mudstones can be found. In some wells there are also yellow sandstones. Cordevol limestone and dolomite are located in the hinterland of the Boršt mill tailings. Discharge in the drainage adit has increased by making every new drainage chamber. Most wells are productive. Precipitation affects the flow of drainage wells with a delay of one to three days, and quantitative changes are lower in the summer months than in the rest of the year.