Abstract: Average daily river flow data, measured by EDF Hydro, an entity of EDF SA. Detailed description: The geographical scope is limited to mainland France, but not its islands. In other words, mainland France (excluding Corsica and Guadeloupe, for example). This data is also stored on www.hydro.eaufrance.fr, the national hydrometric database. The data comes from the Castor application. The provision of these data sets is governed by the national protocol for the water information system (agreement of 11/07/2003 - with SCHAPI-DGPR). The surface area of the catchment is given in km2. The map view shows the number of measurement points per geographical position.