Description: The width that would be occasionally flooded during a 100-year flood (probability of flooding is 1%), if no channel regulation or other flood protection works (e.g. dikes) are in place. Potential flood prone-area is composed by channel, former (areas that were flooded with a certain probability once, and are not flooded anymore mainly due to human intervention) and active (flooding still occurs at certain probability). The flood-prone area once existing under undisturbed conditions might be flooded only when channel and floodplain morphological alterations and human interventions in the hydrological cycle are removed.The spatial layer “Potential flood-prone area extent” was derived from two spatial layers: 1. “JRC flood hazard map for Europe 100-year return period” and 2. “Copernicus Potential Riparian Zone layer” from the ‘Delineation of Riparian Zone’ dataset. “JRC flood hazard map 100-year return period” layer is a result of flood model “LisFlood” and available for Europe in resolution of 100 m *100 m. The description of the map representing 100-year return period flood extent is given in Bates and De Roo (2000) and Alfieri et al. (2014). Copernicus Potential Riparian Zone layer is based on the stratification of different hydrological and geomorphological parameters. These parameters are derived from the input datasets and are weighted differently dependent on their significance and quality. The resulting membership degree of each input parameter is finally combined into a single membership degree expressing the likelihood of an area to be part of a potential riparian zone. The minimum mapping unit of the Potential Riparian Zone (RZ) layer is 0.5 ha (geometric resolution and equivalent scale: raster 25 m and vector 1:50000). Derived spatial dataset of the “Potential flood-prone area extent” in Europe covers an area of 1,221,828 km2 including EEA member countries as well as cooperating countries.
Copyright Text: European Environment Agency
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European Topic Centre on Inland, Coastal and Marine waters (ETC-ICM)