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Design and Function Monitoring of an Enature® Vertical Slot Fish Pass in a Large Potamal River in Carinthia/Austria

1
Department of Water, Atmosphere and Environment (WAU), Institute of Hydraulic Engineering and River Research (IWA), University of Natural Resources and Life Sciences (BOKU) Vienna, A-1180 Vienna, Austria
2
VERBUND Hydro Power GmbH, Europaplatz 2, A-1150 Vienna, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 551; https://doi.org/10.3390/w12020551
Received: 20 January 2020 / Revised: 10 February 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Ecohydraulics of Pool-Type Fishways)
To establish good ecological status in European rivers, firstly there is the question of how to re-establish unhindered migration for fish at barriers. This article documents a project to re-establish longitudinal connectivity at a large epipotamal river at the Schwabeck Hydro Power Plant, Carinthia/Austria, from the selection of an appropriate fish pass system to the final function control. Instead of a standard vertical slot, the innovative enature® fish pass shape with a significant reduction of flow, velocities, energy dissipation rate, and turbulences, but with a clear enhancement of fish passage capability, was chosen. Using 2D hydraulic modelling and a statistical evaluation of fish passage, physical and ecological effects were reviewed, with the clear result that there is no identifiable, positive ecological effect on the number of fish migrating with an increase of concurrent flow in the fish pass. Passability and findability were monitored with the new FishCam, an automatic, precise, and constant (24/7 24 h a day, seven days a week) collection and pre-evaluation field data survey method which does not involve trapping of, contact with, or stress for fish. It was shown that the enature® fish pass enables an unhindered migration for all available fish species. As >99% of fish migrate from April to November, there is no ecological need to operate a fully functional fish pass year-round. Combining all the individual factors together, the fish pass at the Schwabeck Hydro Power Plant is an almost exemplary solution for a fully functioning restauration of the continuum with a minimized loss of generation of electricity. View Full-Text
Keywords: enature® fish pass; longitudinal connectivity; guiding flow; FishCam monitoring; habitat status assessment enature® fish pass; longitudinal connectivity; guiding flow; FishCam monitoring; habitat status assessment
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Mader, H.; Brandl, A.; Käfer, S. Design and Function Monitoring of an Enature® Vertical Slot Fish Pass in a Large Potamal River in Carinthia/Austria. Water 2020, 12, 551.

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