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In the hydrographical basin of Siret river land use types are varied and differentially affects water flow regime, production and transport of the sediments. The largest areas are occupied by agricultural land at a rate of 43%(29%–arable land, 10%-agricultural land heterogeneous, 1, 4%–vineyards and orchards, 2, 8–pastures and others) and forests in a ratio of about 37%. Analyzing the dataset CORINE Land Cover (www. eea. europa. eu) for the study region, between 1990 and 2006, we can say that deforestation prevailed from afforestation. Each main tributaries rivers from the hydrographical basin Siret lost between 1 and 5% of the forest cover. The exception was Putna River Basin which gained 3.6% plus in 16 years reforestation and Buzau where wooded areas did not change in the period considered. At the local level (the basins), the evolution of the wooded areas proved to be more prominent in much higher values. The result of this situation was felt in the production of silt: increases in river basins affected by deforestation and decreases the production of sediments in relation to leaking ponds where the forest area increased.