The EI Mochuelo creek micro-basin, located southwest of Bogota, is occupied by Dona Juana landfills, where a rotational and translational mass movement with garbage flow produced lobes toward its base in September 27 of 1997. The rotational and translational slide contained approximately 800.000 cubic meters of garbage, and runs towards the Tunjuelo River, the greatest fluvial basin, southeast of the Sabana de Bogota. Dona Juana landfills are being used since November 1st of 1988 and are used until August 14th of 2000, assuming that on the two zones, all industrial, domestic and hospital wastes from Bogota and some neighboring towns, will amount 5000 tons average daily. Based on aerial photographs before and after the rotational slide, secondary information and fieldwork control, a description on the geology, geomorphology, morphologic and dynamic aspects and stability evolution of the landfills and analysis about the risk in the micro-basin have been done. Therefore this region does not perform the specifications established by international organizations for being used as a landfill; besides this generates dangerous zones for environmental stability.