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Abstract
The recognition of the possibility of extreme flooding remains a major challenge for hydrometeorologists. In this paper a scoring system for river catchments is described which aims to provide an indication of extreme flood potential. By using the scoring system that identifies the contributions to a flood event from a variety of components it is possible to update and comprehend the likelihood of extreme flooding. The scheme is tested using published data of the consequences of extreme storms in England and Wales. The methodology is capable of formalising intelligence tables often developed by flood forecasting and warning teams in the UK Environment Agency using their local knowledge, but on an ad hoc basis. Such a scoring scheme can be used as a decision support tool by practitioners, both in the UK and elsewhere, if adapted to conditions in other areas.