Geographia. Studia et Dissertationes, T. 34 (2012), s. 23-35.
The paper presents results of investigations on total water hardness of water reservoirs in subsidence
depressions located in the Silesian Upland. The considerations included concentrations of
calcium and magnesium as chiefly responsible for the water hardness. The author also discussed the
main reasons of total water hardness variety with regard to the natural environmental conditions and
the influence of varied human impact.