This report presents some results of the ERINOH research project, dealing with internal erosion in dams and dikes and their foundations. Two databases have been compiled: one of internal erosion incidents and another of case histories of failures to be used to validate numerical models. These databases are tools for improving the safety of dams. The 6 failures recorded were caused by concentrated leak erosion and by backward erosion. Most internal erosion incidents occurred in the foundations, where filters are not always effective. Defective drainage and heavy flows through coarse soils were the causes of 80% of the malfunctions in the dike on the river Rhône.
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