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Article Dans Une Revue Global Environmental Change Année : 2020

A scale-based framework to understand the promises, pitfalls and paradoxes of irrigation efficiency to meet major water challenges

A scale-based framework to understand the promises, pitfalls and paradoxes of irrigation efficiency to meet major water challenges

Alvar Closas
  • Fonction : Auteur
  • PersonId : 1155600
Tim Hess
Jerry W Knox
Stuart Orr
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  • PersonId : 1155607
Jamie Pittock
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  • PersonId : 1155608
Brian Richter
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Philip J Riddell
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Jean-Philippe Venot
Jeroen Vos
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  • PersonId : 1155609

Résumé

An effective placement of irrigation efficiency in water management will contribute towards meeting the preeminent global water challenges of our time such as addressing water scarcity, boosting crop water productivity and reconciling competing water needs between sectors. However, although irrigation efficiency may appear to be a simple measure of performance and imply dramatic positive benefits, it is not straightforward to understand, measure or apply. For example, hydrological understanding that irrigation losses recycle back to surface and groundwater in river basins attempts to account for scale, but this generalisation cannot be readily translated from one location to another or be considered neutral for farmers sharing local irrigation networks. Because irrigation efficiency (IE) motives, measures, effects and technologies play out at different scales for different people, organisations and purposes, and losses differ from place to place and over time, IE is a contested term, highly changeable and subjective. This makes generalisations for science, management and policy difficult. Accordingly, we propose new definitions for IE and irrigation hydrology and introduce a framework, termed an 'irrigation efficiency matrix', comprising five spatial scales and ten dimensions to understand and critique the promises, pitfalls and paradoxes of IE and to unlock its utility for addressing contemporary water challenges.
An effective placement of irrigation efficiency in water management will contribute towards meeting the pre eminent global water challenges of our time such as addressing water scarcity, boosting crop water productivity and reconciling competing water needs between sectors. However, although irrigation efficiency may appear to be a simple measure of performance and imply dramatic positive benefits, it is not straightforward to understand, measure or apply. For example, hydrological understanding that irrigation losses recycle back to surface and groundwater in river basins attempts to account for scale, but this generalisation cannot be readily translated from one location to another or be considered neutral for farmers sharing local irrigation networks. Because irrigation efficiency (IE) motives, measures, effects and technologies play out at different scales for different people, organisations and purposes, and losses differ from place to place and over time, IE is a contested term, highly changeable and subjective. This makes generalisations for science, management and policy difficult. Accordingly, we propose new definitions for IE and irrigation hydrology and introduce a framework, termed an 'irrigation efficiency matrix', comprising five spatial scales and ten dimensions to understand and critique the promises, pitfalls and paradoxes of IE and to unlock its utility for addressing contemporary water challenges.
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Dates et versions

hal-03510413 , version 1 (21-12-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Bruce Lankford, Alvar Closas, James Dalton, Elena López Gunn, Tim Hess, et al.. A scale-based framework to understand the promises, pitfalls and paradoxes of irrigation efficiency to meet major water challenges. Global Environmental Change, 2020, 65, p. 102182 [24 p.]. ⟨10.1016/j.gloenvcha.2020.102182⟩. ⟨hal-03510413⟩
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