Influence of percolation on electric resistivity of bedrocks beneath the Czorsztyn-Niedzica dam

Preliminary report on the electric resistivity measurements in situ of the bedrock beneath the Czorsztyn-Niedzica dam is presented; an analysis is related to the period of filling-up the water reservoir in 1993-1996. Description of the four-electrode measurement system and the equipment is accompanied brief geological information. In theoretical part, some simple two-layer models of water percolation from reservoir bottom are presented. Numerical calculations of rock resistivity are made and compared with the experimental results obtained in the boreholes under the Czorsztyn-Niedzica dam.