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Key hydromorphological pressures are described in the following sections of this report elaborating on the role of hydropower, navigation, flood protection and agricultural drainage as major drivers of impacts on hydromorphology in Europe. Also, separate sections address the role barriers to illustrate their very dense distribution and far-reaching impacts on the European river network and key issues related to the loss of lateral connectivity to floodplains.

Certain aspects of hydromorphological pressures and impacts are less well-known so far in terms of their extent and implications on European scale. One of these aspects is the issue of changed sediment dynamics due to hydromorphological pressures which is gaining more and more attention and will require targeted management interventions in the near future (see Box 2). In the meantime, the issue should remain in focus of further data collection and research to identify the main underlying processes, impacts on water bodies and appropriate management approaches.