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Large wetland areas were drained in favour of widespread intensive agriculture. In the past 50 years, huge drainage and irrigation networks were established and inter-basin water transfer projects took place, e.g. from Trebisnjica River to the Neretva and from the Strymon and Nestos headwaters to the Iskar and Evros basins (Knight and Staneva, 1996). Agricultural development and reservoir construction resulted to dramatic morphological modifications in water bodies. Some lakes and extensive marshes related to river deltas  have been drained. Thus, Greece lost 60–70%, of its original wetlands (Tsiouris and Gerakis, 1991).