ABSTRACTThis paper is a preliminary presentation of some of the results from a study of soil erosion and sedimentation in Lesotho, started in 1973. Sedimentation of six small (0.4-2.8 104m2) reservoirs within Roma Valley and Maliele catchments was studied between 1973 and 1977. The reservoirs have catchment areas varying in size from 0.4 km2to 26 km2. Total (dry matter) accumulation was found to vary from 0 to 4000 metric tonnes with mean annual rates of up to 1100 metric tonnes.