During a fifteen hoars period environment and water quality observations have been realized in a fixe point at the mouth of Sao Goncalo Channel which flows into Patos Laggon. These observations have been done a few hours before and during a cold front that has affected the region and has determined important environment changes in the channel rate of flow because of wind action in a veloccity between 40 and 50 km/h. The changes mat have been verified in the inflow of the tide velocity and in the level of channel water this way reflecting themselves the erosion and transportation of the matter in suspension to the estuarine region, affecting the water quality. In this article, we show the results of this investigation which sticks to the normal standard sample because of roe difficulties imposed by the environment to mis kind of work.
