As a result of expoloatation of brown coal deposits in the Lęknica region (south-western Poland), which was performed here until 1974, developed the characteristic of anthropogenic reservoirs, folded of over 100 water reservoirs. The article presents results of hydrological balance calculations for some anthropogenic reservoirs and their drainage basins, which are located south-western part of lubuskie district, and created in effect of brown coal mining. The aim of this work was to analyze of water balance components diversification and their influence on quality of environment. The study showed that the annual balance open drainage basins reservoirs analyzed in anthropogenic reservoris in Lęknica has a negative retention (–14,14 mm), and positive retention – (+276,90 mm) for closed ones. Overall had a moderately negative water balance of the lake region, which indicates the possibility of restoration of individual tanks, but in limited extent.

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