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Techniques based on motional induced voltage (MIV), which is induced by the water flow across Earth's magnetic field has motivated and increase of interest of oceanographers, regarding studies of large scale ocean flows. The major part of these experiences has been applied to large-scale ocean studies. This technique has been demonstrated during last decade to provide reliable information when applied to the flow monitoring in large oceanic channels. In this paper we present the preliminary results of the implementation of these techniques to smaller scales systems like the one of Ria de Aveiro lagoon (Portugal). A submarine cable crossing the channel at the entrance of the lagoon (Barra channel) allows the estimation of the water flow at this place. The preliminary analysis of the collected data shows that there is a good potential to obtain the water transport (by tidal and residual flows) through the canal by measuring the differences of electrical potential.