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Seepages represent one of the most often risk factors of dam failures and accidents. Question of observation of their development during operation of water structures is therefore continual process, requiring extraordinary attention. Monitoring is instrumental to this purpose. In monitoring special measurements of filtration flow parameters takes also important place. Between these measurements belong one borehole and more borehole geophysical methods of measurement of water movement in boreholes. Their utilisation together with statistical methods can prove or confute suspicion of existence of preferred seepage paths on water structures. Proposed contribution present experiences from executing of such approach to solving of problems in the abutment to the slope of Velka Domasa dam.