On the Upper Rhine River 19 flood retention measures with a total volume of about 260 Mio. m~3 are designed to reestablish a degree of flood protection as it existed before transformation of the Rhine in a canalized river for navigation and power production purposes. It is described in this paper, how under use of a mathematical flood-routing model these retention measures are planned in a way that this aim can be reached, when all these measures will be finished. For those retention measures, which already can be used for flood protection, under the use of the same mathematical model in a cooperation within a german-french working group operation rules are optimized, which are obligatory for the different organizations which are responsible for different retention measures. This operation rules contain also criteria, for which flood forecasts are needed. These forecasts are furnished by the Flood-Forecast-Center Baden-Wurttemberg (HVZ). On the example of the floods from february and may 1999 it is described, how these flood forecasts are used and how the operation rules may be modified during the course of a flood event to reach an optimal flood reduction effect.
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