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Open AccessArticle

Assessment of Environmental Flows from Complexity to Parsimony—Lessons from Lesotho

1
Ove Arup & Partners Ireland Ltd. t/a Arup, 50 Ringsend Rd, Grand Canal Dock, D04 T6X0 Dublin 4, Ireland
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Department of Water Resources and Environmental Engineering, National Technical University of Athens, Heroon Polytechneiou 5, GR-157 80 Zographou, Greece
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ENVECO S. A., 15122 Marousi, Athens, Greece
*
Author to whom correspondence should be addressed.
Water 2018, 10(10), 1293; https://doi.org/10.3390/w10101293
Received: 27 July 2018 / Revised: 28 August 2018 / Accepted: 19 September 2018 / Published: 20 September 2018
(This article belongs to the Section Water Quality and Ecosystems)
Over the last decade, Environmental Flow Assessment (EFA) has focused scientific attention around heavily-modified hydrosystems, such as flow regulated releases downstream of dams. In this light, numerous approaches of varying complexity have been developed, the most holistic of which incorporate hydrological, hydraulic, biological and water quality inputs, as well as socioeconomic issues. Finding the optimal flow releases, informing policy and determining an operational framework are often the main focus. This work exhibits a simplification of the DRIFT framework, and is regarded as the first holistic EFA approach, consisting of three modules, namely hydrological, hydraulic and fish quality. A novel conceptual classification for fish quality is proposed, associating fish fauna requirements with hydraulic characteristics, exported by fish survey analyses. The new methodology was applied and validated successfully at three stream sites in Lesotho, where DRIFT was formerly employed. View Full-Text
Keywords: environmental flows; flow quantiles; artificial flooding; wetted perimeter–discharge; breakpoint analysis; fish quality class; sediments; Lesotho environmental flows; flow quantiles; artificial flooding; wetted perimeter–discharge; breakpoint analysis; fish quality class; sediments; Lesotho
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Tegos, A.; Schlüter, W.; Gibbons, N.; Katselis, Y.; Efstratiadis, A. Assessment of Environmental Flows from Complexity to Parsimony—Lessons from Lesotho. Water 2018, 10, 1293.

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