The hard coal mines in the Upper Silesian Coal\nBasin of southern Poland have highly saline waste water. In\nthe past, such water was often discharged into nearby reservoirs,\nwhich would completely change the physicalââ?¬â??\nchemical properties of the reservoir water. In some cases, it\nalso caused permanent stratification; meromictic reservoirs\nwere created. This paper describes the properties of the water\nin one such reservoir, in a mined out rock quarry in Katowice\n(southern Poland). Three zones characteristic of meromictic\nwater bodies can be distinguished in the reservoir: a surface\natmosphere responsive zone (mixolimnion), a transition\nzone (chemocline), and a bottom unmixed layer (monolimnion).\nFor comparison, baseline conditions for normal reservoir\nwater were assumed to be represented by the nearby\nGrunfeld reservoir, which also formed in a closed quarry, but\nwas not used for disposal of mine waste water.
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