Fast floods on the tributaries of Trotuș river, in the context of current climate change

The paper presents an analysis of the flood formation module in the Trotuș river basin and especially on its tributaries. A special situation was recorded in 2004 when the floods formed on the tributaries presented very high flows, but which did not substantially influence the flow of the main course. The floods produced on the river / stream / torrent type tributaries (example: Asău, Agăș, Goioasa, Iedera) presented flows that exceeded the accepted calculation probabilities. The floods produced were both the effect of torrential rainfall and the configuration of the lower sectors of the riverbeds. The floods produced in 2004 on a series of tributaries of the Trotuș River presented maximum flows that exceeded the calculation probabilities of 0.1% (Agăș - 183 m3/s, Beheghet - 50.70 m3/s, Goioasa - 67.10 m3/s, Iedera - 127 m3/s). The sudden change of the slope on the lower course of the tributaries determined the deposition of a large volume of alluvium, a situation that reduced the flow section and even blocked it. The result of the corroboration of natural and anthropogenic situations in the propagation of these floods is evidenced by the great destruction produced in a territorial area with numerous human communities and important economic activities