Selected result of GPR surveys, which were carried out on the dike of the Vistula River, three days after the flood in 2010, was presented in the paper. Radargram was processed in a standard way, which allowed 2D visualization of main loose zones in the examined dike. Theoretical background of numerical modelling of electromagnetic wave field in the geological medium was presented in the paper. The results of numerical modelling were used for the evaluation of water and air saturation of loose zones during radargram interpretations
