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Socio-Economic Impact of Evaporation Losses from Reservoirs Under Past, Current and Future Water Availability Scenarios in the Semi-Arid Segura Basin

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Abstract

This study assesses evaporation losses from water reservoirs in the semi-arid Segura basin (south-east Spain), one of the most water stressed European catchments. These losses are evaluated from both the hydrologic and economic perspectives under different water availability scenarios that are based on water policy trends and climate change predictions. We take a multidisciplinary approach to the analysis, combining energy balance models to assess the effect of climate change on evaporation from water bodies, Class-A pan data and pan coefficients to determine evaporation loss on a regional scale, and non-linear mathematical programming modelling to simulate the economic impact of water use and allocation in the basin. Our results indicate that water availability could be reduced by up to 40 % in the worst-case scenario, with an economic impact in the 32–36 % range, depending on the indicator in question. The total annual evaporation loss from reservoirs ranges from 6.5 % to 11.7 % of the water resources available for irrigation in the basin, where evaporation from small reservoirs is more than twice that from large dams. The economic impact of such losses increases with water scarcity, ranging from 4.3 % to 12.3 % of the value of agricultural production, 4.0 % to 12.0 % of net margin, 5.8 % to 10.7 % of the irrigated area, and 5.4 % to 13.5 % of agricultural employment. Results illustrate the importance of evaporation losses from reservoirs in this region and the marked upward trend for future scenarios. Besides, they highlight the extent of the impact of climate change on future water resources availability and use in southern Europe.

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Acknowledgments

The authors wish to thank two anonymous referees for their comments and suggestions and Dr. Ana Iglesias for her valuable orientation during early stages of this research. The authors acknowledge the Ministerio de Ciencia e Innovación (Spain), the Spanish National Institute for Agricultural and Food Research and Technology (INIA) and FEDER (Fondo Europeo de Desarrollo Regional) for the financial support of this study through the research projects AGL2010-15001 and RTA2010-00109-C04-03. During the elaboration of this research J.F. Maestre-Valero had a research grant funded by the Spanish Government (AP2007-03428).

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Authors and Affiliations

  1. Universidad Politécnica de Cartagena. Escuela Técnica Superior de Ingeniería Agronómica, Paseo Alfonso XIII, 48, 30203, Cartagena, Spain

    J. F. Maestre-Valero, D. Martínez-Granados, V. Martínez-Alvarez & J. Calatrava

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  1. J. F. Maestre-Valero
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  2. D. Martínez-Granados
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  3. V. Martínez-Alvarez
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  4. J. Calatrava
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Correspondence to J. F. Maestre-Valero.

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Maestre-Valero, J.F., Martínez-Granados, D., Martínez-Alvarez, V. et al. Socio-Economic Impact of Evaporation Losses from Reservoirs Under Past, Current and Future Water Availability Scenarios in the Semi-Arid Segura Basin. Water Resour Manage 27, 1411–1426 (2013). https://doi.org/10.1007/s11269-012-0245-4

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