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Abstract

Decision makers need tools for assessing the impacts of their management practices on the water quality. The complicated nature of simulation models and the large computation time they need hamper the use of these tools in the decision making process. Furthermore, decision makers often lack the detailed domain knowledge to judge processes included in the models. They need decision support tools with an intuitive user interface design simplifying the interaction with models and the visualization of the produced results. REACHER is a generic river basin management tool that assesses the ecological and economic impact of rehabilitation technologies at the river basin scale. The graphical user interface, geographic visualisation and database of the web-based tool have been developed using open source software. REACHER has been developed based on scenario runs with watershed fate models in which rehabilitation measures and associated costs are included. It allows visualisation of the actual chemical, ecological and ecotoxicological status of a river basin and the change in groundwater and surface water status due to the application of a rehabilitation measure or a combination of measures. The scenarios are visualised in REACHER using a Bayesian Belief Network that is trained by multiple runs with the watershed models. A prototype of REACHER is developed and evaluated for two pilot cases, the Odense river (Denmark) and the Scheldt river (France-Belgium). The REACHER tool will be demonstrated during the interactive poster session.

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