the floods in Rio Grande do Sul during 21th century

In Rio Grande do Sul, the floods are natural phenomena in the known population, in particular those that inhabit the valleys of major rivers in the State. The objective of this research concerned to identify the disturbed currents and weather types responsible for the genesis of floods in three Hidrographic Basins regions in the State, between the years 2000 and 2011. Methodology was applied based on the rhythm of Climate. Accordingly, it was observed that most of the flooding occurred due to climatic cycles in which there was the participation of the stationary front and cyclogenesis with time and types of fields inherent to such systems.