Prefeasibility FAH Ybbs und Aschach

The hydropower stations Ybbs-Persenbeug und Aschach don't have lateral open planes to establish conventional fish migration devices (river and pool passes). In a first step a pre-feasibility study should target on technical possibilities to let fish migrate upstream under specific circumstances around the obstacles. The targeted techniques are different types of "fish-lifts", pool passes in combination with vertical slot devices. Archimedical spirals and combinations with fish-lifting spirals will be described to certain details in space and suitability.