A sísmica de refração e o GPR no mapeamento do nível freático de aqüífero não<br>confinado. Uma análise comparativa a partir de um estudo na cidade de São<br>Paulo/Brasil

The work had as objective the water table mapping with GPR (Ground Penetrating Radar) method, and seismic refraction with a comparative analysis between both results, once both answers to the presence of interstitial water of vadosa zone are distinct. Geophysical data were acquired in São Paulo city, in<br>Brazil. Both methods revealed uncertainties in the determination of water table, but for the studied case, the most common errors were associated to the results of seismic refraction due to the uncertainty in the seismic wave velocity determination in the first layer. Considering the studied case, we find out the integration of the worked methods, always possible, can give rise to decrease related to inversion ambiguities of the data, and contribute to better accuracy in water table mapping.