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Dike leakage can be the result of a rupture and the formation of loose zones which are not able to stand the water pressure during flooding. Loose zones are significantly more saturated when it rains and floods than the undamaged portion of the dike. Due to the increased water in loose zones, their electrical properties are changed, particularly dielectric permittivity. As a result, these zones have a different ground-penetrating radar (GPR) wave reflection coefficient and are a source of wave diffraction. The interpretation of GPR measurements carried out on a leaking dike during a flood event in Poland is presented in this paper. The GPR attributes, such as an instantaneous phase, envelope, instantaneous frequency averaged over time and traces, have been analysed in the paper the interpretative tools. Also, the averaged spectrum (spectrum calculated from averaged traces) and moving spectrum (averaged spectrum calculated in windows moving along the traces), as well as the phase spectrum, of recorded GPR data were analysed as indicators of the existence of the deterioration of parts of the dike. As shown in the paper, the use of GPR signals attributes and spectra in the interpretation of field measurements can increase the available information about the structure of the dike by highlighting some of the physical properties of its construction.