Number of properties in a floodplain and those with a significant risk of flooding. NAFRA - National Flood Risk Assessment. There are 3 risk categories: (i) low - 0.5% (1 in 200) chance of flooding each year or less. (ii) moderate - 1.3% (1 in 75) chance or less but greater than 0.5% (1 in 200) chance in any year. (iii) significant - greater than 1.3% (1 in 75) chance in any year. This dataset was updated in 2008. The GLA are yet to receive the raw data. Please follow the links to the Environment Agency website to read the headline findings. Current data from the Envrionment Agency relating to Risk of Flooding from Rivers and Sea (previously known as NAFRA) can be found on their Geostore site
