event 27 Oct 2020

Publication // Assessing River Basin Development Given Water-Energy-Food-Environment Interdependencies

By Robel Geressu, Christian Siderius, Julien J. Harou, Japhet Kashaigili, Laetitia Pettinotti and Declan Conway. The authors apply a multisector spatial computer aided design approach to the Rufiji river basin in Tanzania and consider linkages across the water-energy-food-environment sectors. Results show considerable potential for infrastructure development in the basin but highlight important trade-offs between the sectors, particularly how downstream performance indicators are affected by upstream cumulative effects of informal irrigation expansion, something that may be difficult to regulate in the future.

category Research Papers, Publications and Books tag Nexus Methodology tag Modelling and Assessment tag Food tag Irrigation tag Energy tag Hydropower tag Ecosystems tag WEFE Nexus
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Photo by joel herzog on Unsplash

Abstract

Many river basins in the Global South are undergoing rapid development with major implications for the interdependent water-energy-food-environmental (WEFE) “nexus” sectors. A range of views on the extent to which such natural-human systems should be developed typically exists. The perceived best investments in river basins depend on how one frames the planning problem. Therefore, we propose an approach where the best possible (optimized) implementations of different river basin development scenarios are assessed by comparing their WEFE sector trade-offs. We apply the approach to Tanzania's Rufiji river basin, an area with multiple WEFE interdependencies and high development potential (irrigation and hydropower) and ecosystem services. Performance indicators are identified through stakeholder consultation and describe WEFE sector response under scenarios of river basin development. Results show considerable potential exists for energy and irrigation expansion. Designs that prioritize energy production adversely affect environmental performance; however, part of the negative impacts can be minimized through release rules designed to replicate the natural variability of flow. The reliability of monthly energy generation is more sensitive to environmental-oriented management than the cumulative annual energy production. Overall results highlight how sectoral trade-offs change depending on the extent of development, something that may be difficult to regulate in the future, and that there are important basin-scale interdependencies. Benefits and limitations of the approach and its application are discussed.

Key Points

  • System wide multi-sector assessments reveal the benefits of coordinated interventions and help identify sectoral trade-offs
  • Trade-offs between water, energy, food and environment can be optimised under different scenarios of river basin development
  • Multi-criteria decision-making methods can inform collaborative water-energy-food environment system planning in Tanzania

Published

August 2020

By

Earth´s Future; Volume8, Issue8

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Contact

Tina Schmiers

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