Summary:

The high precipitations, which appears now very frequently, are the main causes of damages in the infrastructure and the properties. Protection against flood should be still developed, but with the special attention on ecology and keep-ing the continuity of water and sediment flow throughout the river channel. Dry dam structure is efficient to mitigate floods, while little disruption of the continuity of the main channel and its flows outside the flood periods. In the paper we ana-lyse the efficiency of selected dry dams during the flood events. We have studied the dry dams located in southern France. In few cases the studies have shown, that dry dams had to be reconstructed in order to protect the area against the flood.