Abstract
The hard coal mines in the Upper Silesian Coal Basin of southern Poland have highly saline waste water. In the past, such water was often discharged into nearby res- ervoirs, which would completely change the physical- chemical properties of the reservoir water. In some cases, it also caused permanent stratification; meromictic reservoirs were created. This paper describes the properties of the water in one such reservoir, in a mined out rock quarry in Katowice (southern Poland). Three zones characteristic of meromictic water bodies can be distinguished in the reservoir: a surface atmosphere responsive zone (mixolimnion), a transition zone (chemocline), and a bottom unmixed layer (monolim- nion). For comparison, baseline conditions for normal res- ervoir water were assumed to be represented by the nearby Grunfeld reservoir, which also formed in a closed quarry, but was not used for disposal of mine waste water.
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