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Report on Monitoring Programmes in the Danube River Basin District according to Water Framework Directive Art. 8 of 2006. Documents are divided into groundwater and surface water, including all relevant annexes.

Groundwater constitutes the largest reservoir of freshwater in the world, accounting for over 97% of all freshwaters available on earth (excluding glaciers and ice caps). The remaining 3% is composed mainly of surface water (lakes, rivers, wetlands) and soil moisture. By incorporation into the Water Framework Directive (WFD), groundwater became part of an integrated water management system.

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.