The earth dam of water reservoir in Gołuchów is equipped with essential measuring instruments. During long-term exploitation groundwater conditions researches have been carried out and dam’s deformation have been measured using piezometers and repers. As a result of progressive self-sealing process of reservoir, some minor improvements of groundwater conditions of the dam has been observed. Geodetic measurements allowed to estimate a correctness of outlet facilities function during reservoir exploitation and dam deformation as well. ...