Two regional groundwater flow models were developed within the framework of the integrated management project "RIVERTWIN". In the case of the Ouémé, the groundwater-related problems are foremost of local character and therefore cannot be addressed by regional models in a meaningful way. It is not possible to give a final recommendation on which modelling concept is the most appropriate in regional integrated modelling and management. Hence, this article is intended to provide an in depth discussion of only the aspects that need to be considered in the process of choosing appropriate modelling concepts.
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