The Hydras 3 Application Software is designed for data management in hydrometrical and meteorological monitoring networks. Hydras 3 offer a practical, user-friendly software structure for the collection, processing, interpretation, evaluation and transmission of measured data from sensors and stations. The software package incorporates powerful functions and a database specialized for hydrological, meteorological and water quality time series management. The software package is continually evolving, with major input from various global water authorities and hydro experts.