The comparison between the observed and simulated sediment yield at the outlet showed large under-or overestimates as for the runoff. A closer look at the rainfall spatial distribution (not presented here) revealed that points with an overestimated sediment yield were linked with rainfall events falling on the very erodible soils (red clay loam badlands), whereas points with an underestimated sediment yield were linked with rain falling mainly on less erodible soils (magmatic rocks) south of the basin.