Résumé
The FRIEND programmes of UNESCO are organized around different research themes and around a common activity database. The harmonization of databases of all programmes adopts common patterns and metadata standards. The integration of hydrometeorological time series and information contained in documents requires the definition of a specific physical pattern of data. Using data from a public audience of researchers requires choosing a Web interface and then building a reliable system to control access. The data administration and the management of the database administration also needs to develop a Web interface.