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Aristeidis G. Koutroulis, Aggeliki-Eleni K. Vrohidou, and Ioannis K. Tsanis

institutional framework, giving directions for the common approach and objectives, principals, definitions, and measures for the management of waters in Europe ( Mylopoulos and Kolokytha 2008 ). The central feature of the WFD is the use of river basins as the basic unit for all planning and management actions ( Gaiser et al. 2008 ). This basin-scale approach was adopted for the present study, attempting to improve the information and assessment of drought for the purpose of providing more robust integrated

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Wai Kwok Wong, Stein Beldring, Torill Engen-Skaugen, Ingjerd Haddeland, and Hege Hisdal

). Droughts are regional in nature and usually cover large areas, and should, hence, be studied within a regional context ( Hisdal and Tallaksen 2003 ). An assessment of regional drought characteristics, such as the spatial extent, provides critical information for different water-based activities including water supply and hydropower production, and should be included in strategic short and long term plans for sound water resource management. In Hisdal and Tallaksen (2003) and Tallaksen et al. (2009

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Kerstin Stahl, Lena M. Tallaksen, Lukas Gudmundsson, and Jens H. Christensen

climate dynamics, such as the length of wet and dry spells, and both approaches are restricted to gauged catchments. As the spatial refinement of regional climate models continues to improve, spatial patterns of the hydrological response (particularly of extremes) to climate forcing are used directly for regional planning and adaptation. This requires, however, that we have sufficient trust in the models—that is, the models need to be validated at the spatial and temporal scale of interest

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Manuel Punzet, Frank Voß, Anja Voß, Ellen Kynast, and Ilona Bärlund

threats to human water security and river biodiversity . Nature , 467 , 555 – 561 . Voß, A. , Alcamo J. , Bärlund I. , Voß F. , Kynast E. , Williams R. , and Malve O. , 2012 : Continental scale modeling of in-stream river water quality: A report on methodology, test runs, and scenario application . Hydrol. Processes , in press . Voß, F. , Voß A. , Bärlund I. , and Alcamo J. , 2009 : Preliminary water quality module: State of development and plan for linkage to the overall

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