Floods and low water levels on the Mediterranean slope are analyzed from a historical perspective, identifying the sequences and patterns of temporal change. flood risks, floods and droughts, their causes and impact on natural systems, analyzing their consequences through a multitemporal study of satellite images and aerial photographs, and its integration with nature climate indicators are analyzed. Also, analyzing the role that climatic conditions, floods and drought exert on the fluvial dynamics, diachronic analyzes of the evolution of channels and systems are carried out, using the daily data of flow of the CHE and applying the directive 2006/60 / CE for the determination of the ecological state of the rivers, in particular the Ebro, Gállego and Cinca
