Great Mendoza (Mendoza, Argentina) is considered an intermediate city at national level and it leads a large space that exceed the provincial borders. The west area of Great Mendoza it is placed in the piedmont between the precordillera of Andes and the plane. This area, according to many authors, doesn't present favourable characteristics for human settlement because of natural and environmental conditions. Geologically it is an active area with two tectonic faults, one in the N-S direction and the other one in the SW-NE direction. The depredation of the natural vegetation by the settlers has accelerated the process of desertification, thus increasing the risk of violent flooding from the west of the site as a result of summer storms. The combination of active faults and slimy soil makes the zone extremely vulnerable. Environmentally, the settlement is not free of pollutin from various sources: pig breeding pens, garbage and trash dumping sites and some factories which contaminate by emission of solid particles.