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In Denmark water erosion is not a general problem from the farmers’ point of view. However, erosion is a potential problem for the aquatic environment, mainly due to loss of phosphorus. Thus, an expert system for predicting water erosion in Denmark was established on the basis of data collected in Denmark during the period 1994 to 1999. The data were collected from fields at local farms. A field was defined as uniformly cultivated, and about 75% of the observations were from fields below 7.5 ha. For each field rill erosion was measured in late autumn and in spring. In total there were 1041 observations, of which 213 had erosion. The figures for erosion were highly right-skewed with a 75% quantile of 1.49 m3 ha-1, and with a maximum value of 28.4 m3 ha-1. The data include the following cultivation systems: grain (winter wheat and winter rape), Christmas trees, ploughed, stubble harrowed, grass and stubble field …