RESUMO
The water quality research performed in the years 2003-2010 demonstrated an impact of the mine water pumped from the closed Olsí uranium mine and discharged from the mine water treatment plant (MWTP) and groundwater from springs in the area on the water quality of the Haduvka stream. The water ecosystems of the lower part of the Haduvka stream are impacted mainly by water originated from the springs located in the stream valley and drained syenit subsoil, naturally rich in uranium. Those inflows caused a very high concentration of uranium measured in the water of the stream, which exceeds the given limit value. No negative impact on the water ecosystems of the receiving Bobruvka River was found. This reduction of impact is caused by five times higher average daily flow rate of the Bobruvka River in comparison with the Haduvka stream, which results in a sufficient dilution of pollution from the Haduvka.
