Abstract
The NELUP decision-support system (DSS) has been developed to provide a quantitative description of the main economic and environmental impacts arising out of rural land-use change at the river-basin scale. The system integrates models of economics, ecology and hydrology with relational and spatial databases, thereby permitting interactive evaluation of different future scenarios through a graphical user-interface. The models are coupled by means of data transfers via the database and allow, for example, the consequences of economic policies on agricultural production to be estimated in terms of predicted impact on water resources and ecological diversity within a basin. The two hydrological modelling systems employed in the NELUP DSS, namely SHETRAN and NUARNO, are described. The utility of the hydrological component is illustrated, making use of an application relating to the problem of stream-fed irrigation in the Cam river basin.
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