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Advances in the aquatic sciences
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Surface bypass as a means of protecting downstream-migrating fish: lack of standardised evaluation criteria complicates evaluation of efficacy

Elena-Maria Klopries https://orcid.org/0000-0003-4752-6619 A B E , Zhiqun Daniel Deng B C , Theresa U. Lachmann A , Holger Schüttrumpf A and Bradly A. Trumbo D
+ Author Affiliations
- Author Affiliations

A Institute of Hydraulic Engineering and Water Resources Management, RWTH Aachen University, Mies-van-der-Rohe-Straße 17, D-52056 Aachen, Germany.

B Pacific Northwest National Laboratory, Energy and Environment Directorate, 902 Battelle Boulevard, Richland, WA 99352, USA.

C Department of Mechanical Engineering, Virginia Tech, 635 Prices Fork Road, Blacksburg, VA 24061, USA.

D US Army Corps of Engineers, Walla Walla District, 201 North Third Avenue, Walla Walla, WA 99362-1876, USA.

E Corresponding author. Email: klopries@iww.rwth-aachen.de

Marine and Freshwater Research 69(12) 1882-1893 https://doi.org/10.1071/MF18097
Submitted: 13 March 2018  Accepted: 12 June 2018   Published: 18 September 2018

Abstract

Surface bypasses are downstream migration structures that can help reduce hydropower-induced damage to migrating fish. However, no comprehensive design concept that facilitates good surface bypass performance for a wide range of sites and species is available. This is why fish-passage efficiencies at recently built bypass structures vary widely between 0% and up to 97%. We reviewed 50 surface bypass performance studies and existing guidelines for salmonids, eels and potamodromous species to identify crucial design criteria for surface bypasses employed in North America, Europe and Australia. Two-tailed Pearson correlation of bypass efficiency and bypass design criteria shows that bypass entrance area (r = 0.3300, P = 0.0036) and proportion of inflow to the bypass (r = 0.3741, P = 0.0032) are the most influential parameters on bypass efficiency. However, other parameters such as guiding structures (P = 0.2181, ordinary Student’s t-test) and trash-rack spacing (r = –0.1483, P = 0.3951, Spearman correlation), although not statistically significant, have been shown to have an effect on efficiency in some studies. The use of different performance criteria and efficiency definitions for bypass evaluation hampers direct comparison of studies and, therefore, deduction of design criteria. To enable meta-analyses and improve bypass design considerations, we suggest a list of standardised performance parameters for bypasses that should be considered in future bypass-performance studies.

Additional keywords: bypass effectiveness, bypass efficiency, downstream migration.


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