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Dynamischer Umgehungsarm Donaukraftwerk Ottensheim-Wilhering — Durchgängigkeit und Lebensraum
Fishpass Ottensheim-Wilhering - Migration route and key habitats At the Austrian Danube hydropower plant ”Ottensheim-Wilhering“ a 14.2 km long bypass channel was built with an average discharge of 17 m3/s in its lowermost section. Apart from the longitudinal connectivity for the species rich Danubian fish fauna, the main focus was to restore type-specific river habitats and especially key habitats like spawning und nursery grounds for rheophilic species. To guarantee the ecological integrity of a bypass channel on the long run, sufficient flow dynamics are of great importance. In the case of the bypass channel ”Ottensheim-Wilhering“ flow dynamics result from variable discharges from the impoundment and especially from the tributaries Aschach and Innbach. The approach of providing both – fish migration and high-quality key habitats – ensures a significant contribution to the goals of the Water Framework Directive as well as the Habitats Directive.