The data set here presented helps to to improve the understanding of dune overwash and breaching processes during storm surges in nearly prototype scale. The experiments were done at the CIEM wave flume at UPC, Barcelona, as part of Hydralab III. The large scale movable-bed hydraulic experiments measure hydrodynamics and sediment processes involved in onshore and offshore sediment transport, dune breaching and overwash. Due to its size, the data set can not be placed on this repository and will be provided on demand. Please contact with the authors or with the data manager of the CIEM installation. More information can be found on the published papers: D'Alessandro, F.; Tomasicchio, R.; Alsina, J.; Caceres, I.; Fortes, C.J.E.M.; Ilic, S.; James, M.; Nagler, L.; Pinheiro, L.V.; Sanchez-Arcilla, A.; Sancho, F.; Shaw, E.; Schüttrumpf, H., 2010. Dune over wash and breaching, Coastlab 2010, Barcelona, Spain.