The modellign system comprises one hydrological model based on a new version of STREAM ("Spatial tools for river basins and environment and analysis of management options"), originated J. Aerts (Free University of Amsterdam). STREAM is a spatially distributed precipitation-runoff model aimed at simulating flow accumulation and discharge rate in large water catchment areas. It has been applied in various basins around the world, as for instance the Rhine, the Ganges/the Brahmaputra, the Yangtze and the Zambeze river basins. The new version of STREAM offers more flexibility in term of input and integrates dams in the hydrological cycle. A calibration module as been incorporated as well.
The hydrological model can have several applications for climate change impact studies in the agricultural sector. At the scale of a watershed, STREAM can be used to estimate the availability of water for irrigation schemes under climate change scenarios. At the scale of a country, the model can be used to evaluate the total actual renewable water resources (TARWR).