Each hydropower plant on the Inn comprises:
- the machinery hall with the turbines,
- the weir systems for flood release,
- the dams and dikes for the accompanying flood protection
- and – if inland drainage has been disrupted by the dams – the pumping stations and ditches, which guarantee agricultural use that existed before construction of the barrage.
The VERBUND hydropower plants on the Inn are therefore not only plants for generating electricity but also improve flood protection in the region. VERBUND also focuses on improving the ecological conditions at individual sites and on restoring natural river landscapes. We implement a large number of measures in this regard, such as:
- creating continuity of flow with fish bypasses,
- giving structure to bodies of water,
- connecting tributaries.
In order to guarantee habitats for fish with all their habitat requirements – from spawn to adult specimens – management of the gravel banks is additionally carried out in the near-natural fish bypass or below the weir. Another important component for the long-term conservation of fish fauna is the maintenance of sediment continuity through sediment management, a topic of the EU Water Framework Directive (WFD) for species conservation in man-made rivers.
Between the powerhouse and the farm building on the land side, a fish ladder was planned back in 1938 during the facility’s construction. In 2014, the fish bypass was redesigned as a slot pass with 53 concrete basin passes. The bypass channel overcomes the entire power plant head of around eight metres.
Further measures on the Inn are: Gravel spawning grounds were ecologically optimised and some old water systems newly laid out and reactivated in the tailwater of the Wasserburg stage. Amphibian ponds and still water areas were also created near the Teufelsbruck power plant. In addition, habitats for grasshoppers and butterflies – particularly suitable for the Jersey tiger – as well as a wetland habitat of around six hectares with ideal conditions for typical regional animal and plant species were created in the dam area.