Increasing risks of floods in urban areas are strongly linked to the increasing pressure of urbanisation, sometimes in areas considered at serious risk of flooding. Expansion of urban areas in OECD countries is potentially creating new zones of risk exposure, sometimes in areas that were considered hundred years ago as natural floodplains (for example, in the area of the city of Lyon in France, cf. Still, there are several examples of flood water storage on farmland in OECD countries (see Erdlenbruch et al., For example, in the United Kingdom (Box 3.4), Beckingham Marshes is a 900 ha area that has had a storage function of flood waters for more than half a century which regulates the flow of the River Trent, near the town of Gainsborough.