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 There are several hundred thousands of barriersand transverse structures  in European rivers. Some of them are large dams for hydropower production or irrigation storage reservoirs, but the majority are smaller. In Germany, for example, it has been estimated that there are some 200 000 transverse structures. In relation to the overall length of Germany’s network of rivers of around 400,000 km, therefore, the continuity of the rivers is interrupted every second kilometre by a technical structure. Several of the RBMPs have identified a large number of barriers in the river basin district. Figure 5.2 illustrates the large number of barriers the Thames RBS and the Seine-Normandy RBD. For both river basin districts large part of the river system is affected by barriers.