Building of the Brzeg Dolny dam in 1958 has changed the influence of the Odra River on the adjacent areas. After damming up the water the Odra River supplies the valley of waters filtering from reservoir. Drainage devices did not fulfill its role and some part of terrain was flooded. The regulation of the Jeziorka stream was done and in 1967 the drainage set was completed of deep channel built along the side dam of reservoir and in distance about 80 m from it. The analysis of flow intensity in the channel on the background of water levels in the Odra in the Brzeg Dolny – Wały section (up the dam) is presented in the paper. The base of investigations were the direct flow intensity measurements in the channel in the Warzyna section in 1971–2004. The analysis of these results showed that with passing the time on the same table of damming up the water on weir the more and more smaller values of flow intensities in the channel are observed. It is caused by clogging processes of the Odra bed and the terrains within embankments.

3-11