The exploitation by dissolution has different characteristics compared to other types of exploitations, because these types of exploitations are exposed to uncontrolled dissolution phenomenon, which may occur in rapid subsidence and collapse, depending on the value of the hydraulic gradient. Study of areas affected by the exploitation of salt by dissolution was and is a constant concern of those in charge with the exploitation but has not been analysed in detail. The research was limited only to monitor the phenomena and to find solutions for eliminating the consequences than knowledge and removing the causes
