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Ruin-of-the-rivers? A global review of run-of-the-river dams. | LitMetric

Ruin-of-the-rivers? A global review of run-of-the-river dams.

Environ Manage

University of Natural Resources and Life Sciences, Vienna, Department of Water, Atmosphere and Environment, Institute of Hydrobiology and Aquatic Ecosystem Management, Gregor-Mendel-Straße 33, 1180, Wien, Austria.

Published: October 2024

AI Article Synopsis

  • * ROR dams can displace communities, disrupt livelihoods, harm aquatic ecosystems, contribute greenhouse gas emissions, and alter downstream water flow, with impacts varying by location and project size.
  • * The problematic labeling of impactful dams as low-impact ROR projects can mislead the public, as the vague definition of ROR allows proponents to downplay adverse effects, undermining efforts to address climate change within frameworks like the Clean Development Mechanism.

Article Abstract

The classification of a hydropower scheme as run-of-the-river (or run-of-river; ROR) evokes an image of a low-impact installation; however, examination of eight case studies worldwide shows that substantial negative societal and ecological impacts are tied to them, albeit in somewhat different ways. We conclude that ROR dams not only potentially displace communities, disrupt livelihoods, and degrade environments in surrounding areas, but they also divert water from areas of need, impact aquatic ecology through habitat destruction and disruption of fish migrations, emit non-trivial amounts of greenhouse gases over the lifespan of the project, and disrupt streamflow in downstream river sections. While these negative impacts vary on a case-by-case basis, medium and large ROR dams consistently have multiple and cumulative impacts, even when not having appreciable reservoirs. We contend that many impactful dams do not qualify as low-impact ROR projects, despite being defined as such. Such mislabeling is facilitated in part by the ambiguous definition of the term, which risks the ROR concept being used by proponents of impactful structures to downplay their negative effects and thus mislead the public or gain status, including within the Clean Development Mechanism in relation to mitigating climate change.

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Source
http://dx.doi.org/10.1007/s00267-024-02062-5DOI Listing

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