Web technology provides public access to advanced simulation models and efficiently distributes vast volumes of data in an unprecedented way. The traditional boundary between the producers and the users of data has become less distinct. Users now download data generated by themselves or by others. The role of the hydrologist has therefore shifted towards the management of systems and tools that are publicly available. A recent example of this development is the SMHI VattenWeb, a web application that makes available different databases and modelling tools managed by the Swedish Meteorological and Hydrological Institute. Since VattenWeb was primarily developed to meet the demands of the EU Water Framework Directive, one of the key elements is a database of simulated discharge and nutrient transport generated by the SMHI HYPE model. These data consist of daily, monthly and annual hydrologic simulations for all Swedish water bodies reported within the WFD. We show the present status of SMHI VattenWeb and highlight the strategies that have made this application successful among users seeking to characterize the quantity and quality of water at high spatial resolution across Sweden.