Bypass
From BAWiki
Definition
In most cases a pipe- or channel-like structure which enables fish that want to descend to bypass hydropower plants and rake facilities.
Synonyms
Abbreviations
Source
Guideline Upstream Fishways on German Federal Waterways (AH FAA), Bundesanstalt für Wasserbau (BAW) und Bundesanstalt für Gewässerkunde (BfG), Version 2.0, 26/06/2015 (retrieved 10.05.2017)