Long-term processes and regulation in the flood-relief channel New Danube in Vienna (Austria) - current position and proposals for management control strategies
The New Danube, a man-made flood-relief bypass channel alongside the River Danube in Vienna, is intended to serve manifold purposes: the most important of these are flood control, recreation, drinking water supply, and providing a groundwater supply to the hinterland on the left bank of the channel. An 11-year study clearly shows the close interdependency of water quality between the River Danube, the two impoundments of the New Danube, and the underground aquifer of Danube Island - a narrow, artificially constructed island separating the channel from the main river. As a key chemical factor in the New Danube, phosphorus is evaluated and used for predicting future trends and maintenance of water quality. Biomass of aquatic macrophytes is an important factor in controlling phosphorus concentrations and maintaining trophic status in the two impoundments; careful management of the macrophytes is therefore crucial.