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The Joint Danube Survey 2001 was carried out by the ICPDR and is the most homogenous analysis of the water quality and the ecological status of the Danube River. Over 140 chemical and biological parameters were analysed and over 40.000 laboratory results were generated.

Common layers: Danube River Basin District (DRBD), Danube, Tributaries (river basins > 4,000 km²), Lakes (surface area > 100 km²), Lagoons (surface area > 100 km²), Black Sea Coastal Catchments, Canals, National borders, Cities
Scale: 1 : 4,500,000

The TransNational Monitoring Network is an important tool under the Danube River Protection Convention (DRPC), whose Contracting Parties are committed to co-operate in the field of monitoring and assessment. Formally launched in 1996, the TNMN aims to provide a well-balanced overall view of pollution and long-term trends in water quality and pollution loads in the major rivers in the Danube River Basin.

Expert Groups (EGs) are the backbone of the operation and the success of the ICPDR. They are composed of national experts from the Contracting Parties and representatives from ICPDR observer organisations. Eight different Expert Groups deal with a variety of issues and make recommendations to the ICPDR.

The Accident Emergency Warning System (AEWS) of the Danube River Basin is activated whenever there is a risk of transboundary water pollution, or threshold danger levels of certain hazardous substances are exceeded.

The Danube River is seeing an influx of new non-native species, stemming from the increasing interconnections with various European and global water bodies via canals and other waterways designed to facilitate navigation. It is currently believed that alien species are very likely to become even more significant in the future, as the importance of the Danube as an international waterway increases.