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05-01-2021 | Issue 2/2021

Environmental Management 2/2021

Evaluating the Ecological Benefits of Management Actions to Complement Environmental Flows in River Systems

Journal:
Environmental Management > Issue 2/2021
Authors:
Sam Nicol, J. Angus Webb, Rebecca E. Lester, Marcus Cooling, Paul Brown, Ian Cresswell, Heather M. McGinness, Susan M. Cuddy, Lee J. Baumgartner, Daryl Nielsen, Martin Mallen-Cooper, Danial Stratford
Important notes

Supplementary Information

The online version of this article (https://​doi.​org/​10.​1007/​s00267-020-01395-1) contains supplementary material, which is available to authorised users.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Abstract

Globally, many river systems are under stress due to overconsumption of water. Governments have responded with programmes to deliver environmental water to improve environmental outcomes. Although such programmes are essential, they may not be sufficient to achieve all desired environmental outcomes. The benefits of environmental water allocation may be improved using ‘complementary measures’, which are non-flow-based actions, such as infrastructure works, vegetation management and pest control. The value of complementary measures is recognised globally, but their ecological benefits are rarely well understood, either because there is limited experience with their application, or the importance of context- and location-specific factors make it difficult to generalise benefits. In this study, we developed an approach to evaluate complementary measures at different levels of detail as a mechanism to aid decision-making. For systems that require a rapid, high-level evaluation, we propose a score-based multi-criteria benefit assessment module. If more ecological detail is necessary, we outline a method based on conceptual models, expert elicitation and probability assessment. These results are used to populate a cumulative benefit assessment tool. The tool evaluates the benefits of proposed measures in the wider context by including variables such as flow, dependence on ongoing maintenance and additional ecological values. We illustrate our approach through application to the Murray–Darling Basin, Australia. As many water recovery programmes mature into their evaluation phases, there is an increasing need to evaluate the ecological benefits of including complementary measures in the toolkit available to policy makers.

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