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Observed changes in temperature and precipitation have already been found to affect river flow, with substantial regional and seasonal variation across Europe (EEA (report under preparation) 2012b, section 3.3). In general, flows have increased in winter and decreased in summer since the 1960s. Climate change is projected to result in strong changes in the seasonality of river flows across Europe. Summer flows are projected to decrease in most of Europe, including in regions where annual flows are projected to increase.