Hydromax is a real-time application for riverflow forecasting which is developped by CESAME and is operational at SETHY (Service d'Ètudes Hydrologiques, Walloon Ministry of Public Works - Belgium) for the management of flood alarms and the on-line information of the rescue services in the Meuse river basin.   From the telemetering network to Hydromax Hydromax is connected with the telemetering network of SETHY. This network is essentially made up of water level chart recorders and rain gauges. All the remote measurements are stored in a hydrological data base on the central computer. The forecasting computer is connected to it on-line (Fig.1).   The main features of Hydromax Direct connection with the telemetering data base. Short term riverflow forecasting only based on hydrological measurements. Long term riverflow forecasting based on hydrological measurements and meteorological forecasts. Data processing and model performance analysis.    The advantages of Hydromax Data saving : only rainfall and riverflow data are needed. A detailed physical description of the basin is not required. The identified parameters remain valid from a flood to another : the models are systematically validated on floods which are not used for the model identification. Friendly user design in order to meet the requirements of an efficient real time forecasting.   A typical example of Hydromax windows for flood forecasting Hydromax provides both short term and long term riverflow forecastings. This is illustreted in Fig.3 where typical windows of Hydromax are presented. The short term prediction (blue dot) is computed from on-line field measurements (rainfall and discharge). The long term forecasting (red curve) is computed from meteorological forecasts. The green curve is the riverflow forecasting without rainfall. It is the most optimistic hypothesis.   Hydromax is developped by CESAME and is operational at MET-D212-SETHY Boulevard du Nord, 8 5000 Namur Belgium   G. Bastin & L. Moens -CESAME - Bâtiment Euler Av. Georges Lemaître 4 1348 Louvain-la-Neuve, Belgium