EEA potential flood-prone area extent

The EEA potential flood prone area extent delineates the area that is flooded once every 100 years, i.e. the probability of flooding is 1% assuming that flooding is unrestricted. The potential flood prone area is comprised of the river channel and floodplain. In reality, the floodplain is split into an active floodplain where flooding still occurs, and former floodplain where flooding is restricted due to flood protection. The former floodplain could be flooded again either if a flood exceeds the capacity of flood protection, or if factors that control the presence of water were removed. These factors include channel and floodplain morphological alterations as well as structural flood protection measures. The spatial coverage of the data set is EEA39 countries.欧洲环境署（EEA）潜在洪水易发区范围，划定了百年一遇洪水所覆盖的区域，即假设洪水无管控限制时，洪水发生概率为1%。该潜在洪水易发区由河道与河漫滩共同构成。在实际情形中，河漫滩被划分为两类：一类是仍会发生洪水的活动河漫滩，另一类是因防洪措施而限制了洪水侵入的旧河漫滩。当洪水超出防洪设施的承载能力，或是管控水体留存的相关因素被移除时，旧河漫滩可能会再次遭受洪水侵袭。上述管控因素包括河道与河漫滩的形态改造，以及各类实体防洪工程措施。 本数据集的空间覆盖范围为EEA39成员国。