The Environment Agency has a set of about 70 environmental indicators, which help to show how the Environment Agency is contributing to its objective of sustainable development. It is recognised that some of the indicators are not ideal and a programme of work has been started to extend improve the quality of these indicators. As part of this programme the Environment Agency needs to replace the indicator for major flooding incidents because there is no clear definition of what is a major flooding incident and it is difficult to update. An alternative indicator based on hydrological and particularly extreme event data is considered more appropriate to analyse patterns of flood behaviour over time. The aim of this project was to develop this flood indicator.