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The purpose of this section is to review current states and trends of Europe’s water resources and to identify external drivers of change with relevance for water resources management and the resulting pressure exerted on Europe’s water resources. This will be followed by a review of the possible projections of future state of Europe’s water resources. Effective management of water resources is required to ensure that throughout Europe a sufficient quantity of good quality water is available for people’s needs and for the environment, as well as ensuring adequate protection against the adverse impacts caused by floods. The temporal and spatial scales characterising the hydrological system vary considerably across Europe. For example, a local flash flood can happen in a manner of hours, while regional water scarcity can develop over years and even decades.