Irrigation mix: how to include water sources when assessing freshwater consumption impacts associated to crops
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Impacts of activities related to freshwater use are gaining interest among the life cycle assessment (LCA) community and several approaches are nowadays available in the literature. However, the general trend still is to ignore the assessment of its impact or, luckily, its inclusion on the inventory. This paper describes a procedure to incorporate water source information at the inventory level and evaluate the influence of that profile on the environmental impact assessment level.
The methodology lies on two main elements: the “irrigation mix” concept and the freshwater ecosystem impact indicator already defined in the literature. By doing so, the results obtained can be easily integrated in LCA studies of irrigated crops, or more complex studies with agricultural ingredients, where only information regarding the amount (but not the origin) of irrigation water is available.
Results and discussion
The results make more visible the benefits associated to the use of nonconventional, artificial water sources, by quantifying the improvement achieved on the water stress of a specific basin. Besides, the irrigation mix gives a better picture of the real contribution of irrigation to other impact categories (here, the global warming potential). Finally, the results were applied in a LCA study of lettuce production (an irrigated product cultivated in the studied region), and the method was analyzed against the criteria defined by the International Reference Life Cycle Data System handbook.
The inclusion of the water mix in the inventory level (irrigation profile) as well as in the impact assessment level (water stress index) is straightforward to apply by LCA practitioners, resulting in a more realistic assessment of the impacts of freshwater consumption associated to crops. The implementation on a case study allowed the quantification of promoting alternative water sources in a region suffering from significant water stress as well as to improve knowledge on the environmental impact associated to freshwater consumed by one of the irrigated crops grown there. We recommend using the approach defined here in order to check its applicability to other river basins and products.
KeywordsBlue water Desalinated water Impact assessment Inventory Life cycle assessment Wastewater
Dr. Hospido belongs to the Galician Competitive Research Group GRC2010/37. She thanks the Galician Autonomous Government for financial support during her research stay at IRTA and for the project 09MDS010262PR. Dr. Núñez wishes to thank the Ecotech-Sudoe SOE2/P2/E377 GT3.3, an Interreg IV b SUDOE project, for their financial support. She also thanks the members of the Environmental Life Cycle & Sustainability Assessment research group (www.elsa-lca.org) for helpful discussions.
- Boulay AM, Bulle C, Bayart JB, Deschênes L, Margni M (2010) LCA characterization of freshwater use impacts on human health and through compensation. CYCLE, Montreal, Canada, www.ciraig.org/en/publications_e.html
- CHS (2010a) Confederación Hidrográfica del Segura. Water resources—desalination. Murcia, Spain, www.chsegura.es/chs_en/cuenca/resumendedatosbasicos/recursoshidricos/desalacion.html
- CHS (2010b) Confederación Hidrográfica del Segura. Water resources—summary. Murcia, Spain, www.chsegura.es/chs_en/cuenca/resumendedatosbasicos/recursoshidricos/resumen.html
- CHS (2010c) Confederación Hidrográfica del Segura. Water resources—reuse. Murcia, Spain, www.chsegura.es/chs_en/cuenca/resumendedatosbasicos/recursoshidricos/reutilizacion.html
- CHS (2010d) Confederación Hidrográfica del Segura. Water resources—Tagus-Segura transfer. Murcia, Spain, www.chsegura.es/chs_en/cuenca/resumendedatosbasicos/recursoshidricos/trasvaseTajoSegura.html
- EC (European Commission) (2000) Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Luxembourg, http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2000:327:0001:0072:EN:PDF
- EeE (2010) Ecologistas en Acción. La Red del Tajo se posiciona contra el trasvase Tajo-Segura [in Spanish]. Madrid, Spain, www.ecologistasenaccion.org/article12456.html
- FAO—Food and Agriculture Organization of the United Nations (2010) Estimated world water use. Rome, Italy, www.fao.org/nr/water/infores_maps.html
- Goedkoop M, Spriensma R (2001) The Eco-indicator 99. A damage oriented method for life cycle impact assessment: methodology report 3rd edition. Amersfoort, the Netherlands, www.pre.nl/download/misc/EI99_annexe_v3.pdf
- Hoekstra AY, Chapagain AK, Aldaya MM, Mekonnen MM (2010) The water footprint assessment manual: setting the global standard. Earthscan: London, UKGoogle Scholar
- IPCC (2007) Intergovernmental panel on climate change. climate change 2007—4th assessment report. The Physical Science Basis, Geneva, SwitzerlandGoogle Scholar
- JRC—Joint Research Centre European Commission (2010) ILCD Handbook—framework and requirements for life cycle impact assessment models and indicators. Ispra, Italy; lct.jrc.ec.europa.eu/pdf-directory/ILCD-Handbook-LCIA-Framework-requirements-online-12March2010.pdfGoogle Scholar
- MARM—Ministry of Environment, Rural and Marine Affairs (2010a) Murcia—Un modelo avanzado de agricultura sostenible [in Spanish], Madrid, Spain, aplicaciones.mapya.es/documentos_pwe/seminarios/pwp_horticola_murcia.pdfGoogle Scholar
- MARM—Ministry of Environment, Rural and Marine Affairs (2010b) Libro Digital del Agua—Demanda y uso del agua [in Spanish], Madrid, Spain, servicios2.marm.es/sia/visualizacion/lda/socioeconomico/demanda.jspGoogle Scholar
- MARM—Ministry of Environment, Rural and Marine Affairs (2010c) Sistema de Indicadores de Agua—Volumen de agua reutilizada [In Spanish], Madrid, Spain, servicios2.marm.es/sia/indicadores/ind/ficha.jsp?cod_indicador=45&factor=respuestaGoogle Scholar
- MARM—Ministry of Environment, Rural and Marine Affairs (2010d) Programa A.G.U.A. [In Spanish], Madrid, Spain, www.mma.es/secciones/agua/entrada.htm
- MARM—Ministry of Environment, Rural and Marine Affairs (2010e) Libro Digital del Agua – Recursos Hídricos: Reutilización [In Spanish], Madrid, Spain, servicios2.marm.es/sia/visualizacion/lda/recursos/noconvencionales_reutilizacion.jspGoogle Scholar
- Núñez M, Pfister S, Antón A, Muñoz P, Hellweg S, Kölher A, Rieradevall J (2012) Assessing the environmental impacts of water consumption by energy crops grown in Spain. J Ind Ecol. doi: 10.1111/j.1530-9290.2011.00449.x
- Steward M, Weidema B (2005) A consistent framework for assessing the impacts from resource use: a focus on resource functionality. Int J Life Cycle Assess 10(4):204–247Google Scholar