In this paper the changes of the Ner River capacity are analyzed. The last changes are the direct results of river training done in 2007. The regulation was done due to the requirements of Voivodeship Board of Water Reclamation in Konin. The training consist of mud removal of the Ner River reach of length 20 km. This is the reach from the Ner junction with the Warta River to the border of Great-Poland. The increase of river capacity is important for reduction of the flood risk in the region. The changes of river capacity are also important from the environmental point of view. The Ner Valley, as part of Great-Valley of Bzura and Ner, is a part of Natura 2000 network since 2004. These are the most valuable wetlands of central Poland. Since any human impact on the river may be the reason of the ecosystem degradation. The mentioned issues show that the Ner River problems may be investigated form two different points of view: technical and environmental. Theoretically, this may be a reason of conflicts caused by divergent requirements imposed on the watershed existence.

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