Irrigation efficiency and water-policy implications for river-basin resilience

Scott, C. A.; Vicuña, S.; Blanco Gutiérrez, Irene; Meza, F. y Varela Ortega, Consuelo (2014). Irrigation efficiency and water-policy implications for river-basin resilience. "Hydrology And Earth System Sciences", v. 18 (n. 4); pp. 1339-1348. ISSN 1027-5606. https://doi.org/10.5194/hess-18-1339-2014.

Descripción

Título: Irrigation efficiency and water-policy implications for river-basin resilience
Autor/es:
  • Scott, C. A.
  • Vicuña, S.
  • Blanco Gutiérrez, Irene
  • Meza, F.
  • Varela Ortega, Consuelo
Tipo de Documento: Artículo
Título de Revista/Publicación: Hydrology And Earth System Sciences
Fecha: Abril 2014
Volumen: 18
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Economía Agraria, Estadística y Gestión de Empresas
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Rising demand for food, fiber, and biofuels drives expanding irrigation withdrawals from surface water and groundwater. Irrigation efficiency and water savings have become watchwords in response to climate-induced hydrological variability, increasing freshwater demand for other uses including ecosystem water needs, and low economic productivity of irrigation compared to most other uses. We identify three classes of unintended consequences, presented here as paradoxes. Ever-tighter cycling of water has been shown to increase resource use, an example of the efficiency paradox. In the absence of effective policy to constrain irrigated-area expansion using "saved water", efficiency can aggravate scarcity, deteriorate resource quality, and impair river basin resilience through loss of flexibility and redundancy. Water scarcity and salinity effects in the lower reaches of basins (symptomatic of the scale paradox) may partly be offset over the short-term through groundwater pumping or increasing surface water storage capacity. However, declining ecological flows and increasing salinity have important implications for riparian and estuarine ecosystems and for non-irrigation human uses of water including urban supply and energy generation, examples of the sectoral paradox. This paper briefly considers three regional contexts with broadly similar climatic and water-resource conditions – central Chile, southwestern US, and south-central Spain – where irrigation efficiency directly influences basin resilience. The comparison leads to more generic insights on water policy in relation to irrigation efficiency and emerging or overdue needs for environmental protection.

Más información

ID de Registro: 40263
Identificador DC: http://oa.upm.es/40263/
Identificador OAI: oai:oa.upm.es:40263
Identificador DOI: 10.5194/hess-18-1339-2014
URL Oficial: http://www.hydrol-earth-syst-sci.net/18/1339/2014/
Depositado por: Memoria Investigacion
Depositado el: 05 May 2016 17:01
Ultima Modificación: 05 May 2016 17:01
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