Decision support for planning and management of water resources needs toconsider many target criteria simultaneously like water availability, waterquality, flood protection, agriculture, ecology, etc. Hydrologic modelsprovide information about the water balance components and are fundamentalfor the simulation of ecological processes. Objective of this contribution isto discuss the suitability of classical hydrologic models on one hand and ofcomplex eco-hydrologic models on the other hand to be used as part ofdecision support systems. The discussion is based on results from two modelcomparison studies. It becomes clear that none of the hydrologic modelstested fulfils all requirements in an optimal sense. Regarding the simulationof water quality parameters like nitrogen leaching a high uncertainty needsto be considered. Recommended for decision support is a hybrid metamodelapproach, which comprises a hydrologic model, empirical relationships for theless dynamic processes and makes use of simulation results from complexeco-hydrologic models through second-order modelling at a generalized level.
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