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Since the 16th century, people have been changing the natural course of the rivers in the Danube River Basin, mainly for flood defence, hydropower generation and navigation. All these changes affect the ecological quality of the rivers. Changes in the depth or width of a river typically reduce flow rates, interrupting natural sediment transportation as well as the migration routes of animals.

The status of waters of the Danube River Basin is largely influenced by inputs of pollutants, particularly organic material, nutrients, hazardous substances and plastics. The ICPDR regularly updates specific emission inventories addressing both point source and diffuse emissions. The ICPDR also develops policy guidance documents providing recommendations for Danube countries on how to address pollution problems and the measures that need to be implemented in order to reduce emissions. In addition, the ICPDR supports capacity building activities on issues related to pollution control.