%0 Conference Paper %A De Luca, Paolo %A Hillier, John %A Wilby, Robert %A Quinn, Nevil W. %A Harrigan, Shaun %D 2017 %T Extreme multi-basin flooding linked with extra-tropical cyclones [Poster] %U https://repository.lboro.ac.uk/articles/poster/Extreme_multi-basin_flooding_linked_with_extra-tropical_cyclones_Poster_/9486299 %2 https://repository.lboro.ac.uk/ndownloader/files/17111606 %K untagged %K Earth Sciences not elsewhere classified %X Fluvial floods are typically investigated as ‘events’ at the single basin-scale, hence flood management authorities may underestimate the threat of flooding across multiple basins driven by large-scale and nearly concurrent atmospheric event(s). We pilot a national-scale statistical analysis of the spatio-temporal characteristics of extreme multi-basin flooding (MBF) episodes, using peak river flow data for 260 basins in Great Britain (1975-2014), a sentinel region for storms impacting northwest and central Europe. During the most widespread MBF episode, 108 basins (~46% of the study area) recorded Annual Maximum (AMAX) discharge within a 16-day window. Such episodes are associated with persistent cyclonic and westerly atmospheric circulations, atmospheric rivers, and precipitation falling onto previously saturated ground, leading to hydrological response times <40h and documented flood impacts. Furthermore, peak flows tend to occur after 0-13 days of very severe gales causing combined and spatially-distributed, yet differentially time-lagged, wind and flood damages. These findings have implications for emergency responders, insurers and contingency planners worldwide. %I Loughborough University