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As the fourth most water-rich river in Germany, the Inn was used for energy production at an early stage. 14 hydroelectric power plants in the German section of the river impair the passability for fish. In addition, the Inn was straightened, expanded and dammed for land reclamation, shipping, flood protection and energy production, thus losing its natural dynamics. Within the framework of the Inn River Development Plan, bypass channels for fish migration, flood troughs for flood protection and biodiversity and new alluvial forest were created. Gravel banks and embankments were remobilized in order to get bed load moving again, and longitudinal bank structures and installations for flow deflection were removed. The project was accompanied by a ten-year research project on the habitat requirements of Inn fish.
approx. 15 km removal of bank protection, approx. 20 riverbed ramps, 20 hectare of remobilization of gravel banks, approx. 70 hectare of conversion of forestry shaped alluvial forest, 8 km of new alluvial channels