English Abstract The model DEMNAT-2 is designed to predict the impact of
water management scenarios on groundwater-dependent ecosystems. The model
can be applied to national and regional studies, provided there is enough
ecological data available for this purpose. Input to DEMNAT is formed by
hydrological changes, for example changes in seepage intensity and spring
groundwater level, which can be predicted with existing hydrological models.
Output is formed by changes in the completeness of 15 ecosystem types and in
resulting values for nature conservation. Three modules of DEMNAT can be
distinguished: geographical schematisation of a lot of hydrological and
ecological data, dose-effect functions for calculation and valuation of
effects. This report ends with a chapter discussing DEMNATs usefulness: its
main shortcomings are shown and possible improvements
mentioned.
