Management trends and responses to water scarcity in an irrigation scheme of Southern Spain

García-Vila, Margarita; Lorite, Ignacio J.; Soriano, María-Auxiliadora; Fereres, E.

doi:10.1016/j.agwat.2007.11.009

Cited by 67 publications

(49 citation statements)

References 30 publications

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“…Rivers regulated for irrigation often have lower flows (compared to natural values) during the cold and wet period when reservoirs are being filled, and flows are significantly higher than natural values during the warm and dry months, when irrigation demands occur. During the spring and summer, water consumption can be very high and poor water management combined with low productivity can worsen the environmental impact (e.g., García-Vila et al 2008). Farmers with exchange agreements or water rights generally pay very low prices, and political forces exert a pervasive influence on irrigation subsidies.…”

Section: Discussionmentioning

confidence: 99%

The Environmental Costs of Water Flow Regulation: an Innovative Approach Based on the ‘Polluter Pays’ Principle

Jalón

Tanago

Alonso

et al. 2017

Water Resour Manage

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The EU Water Framework Directive (WFD) explicitly requires the full cost recovery of water services, including the environmental costs incurred from the damage that water uses inflict on the environment. Although flow regulation by river damming is one of the most prominent human impact on fresh water ecosystems its environmental costs are not properly included in water pricing. This paper presents a novel approach to assessing the environmental costs of flow regulation based on the polluter-pays principle. The methodology includes three steps: (i) assessing the admissible range of regulated flow variability, derived from the natural flow regime variability, (ii) estimating the daily environmental impact of regulated flows according to deviations from the admissible range of flow variability, and (iii) calculating the environmental costs of flow regulation. The procedure is applied to four river case studies in Spain, UK and Norway. The advantages over other water cost valuation methods are discussed. The methodology enlarges the current recognition of environmental costs of water use and represents a practical management tool within the WFD context, encouraging transparency and stakeholder communication.

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Section: Discussionmentioning

confidence: 99%

The Environmental Costs of Water Flow Regulation: an Innovative Approach Based on the ‘Polluter Pays’ Principle

Jalón

Tanago

Alonso

et al. 2017

Water Resour Manage

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“…In contrast, García-Vila et al (2008) estimated that supply did not reach 70% of the demand for the same years. This discrepancy is due to the standpoint A model for managing hydrological risks S215 Table 3.…”

Section: Drought Economic Risksmentioning

confidence: 93%

“…This is about 30% less than the crops demanded in theory, but it represents a standard behaviour over the entire period studied of the district. García-Vila et al (2008) suggested that farmers in Genil-Cabra may be risk averse, misguided by the Common Agricultural Policy subsidised crops and perhaps too old to recognise options that might increase profits. We believe that other factors must be constraining their decisions to explain the continuous poor performance over the 16-year period, and we assume that the presumably suboptimal application rates can be taken as normal.…”

Section: Drought Economic Risksmentioning

confidence: 99%

“…Probabilities of not meeting the stochastic irrigation water demand from which the crops' water demand is estimated. While in this paper the demand was based on the observed cropping patterns, which may have already included less-demanding crops, García Vila et al (2008) optimised the land and water potentials and compared those with the observed water application levels. During 1991 and 2005, their evaluation of the ARIS (Annual Relative Irrigation Supply) ratio of the «Annual volume of irrigation water flow» and the «Annual volume of crop irrigation demand» was always below 0.7.…”

Section: Drought Economic Risksmentioning

confidence: 99%

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How to link agricultural productivity, water availability and water demand in a risk context: a model for managing hydrological risks

Gil-Sevilla

Garrido

Gómez-Ramos

1970

Span. j. agric. res.

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The importance of water scarcity in irrigated agriculture in Spain provides the rationale for this paper, which analyses and evaluates the risk of water shortage on the economic result of this kind of agriculture. The main objective is to monitor this risk on a real-time basis. For this aim, we first estimated a number of regression models that explain irrigated agricultural productivity based on crop price indices, a time trend and water availability. These models, which correct for auto-correlation, yield good explanatory power. Second we carried out ex ante simulations of agricultural productivity using fitted distribution functions of water balance. The risk model framework provides the basis for a real time drought management system through a variety of distribution functions of expected economic results, which can be revised on a monthly basis before the beginning of the irrigation season. The results of the simulation show how this kind of risk model can be used to anticipate the effects of droughts and complement the hydrological models used to manage water storage in years of scarcity. Different risk profiles are identified. For example, in Genil-Cabra we found that the resilience of the system after a drought period is very high, whereas in La Plana de Castellón the risk of irrigation area abandonment is increasing year by year. In Genil-Cabra the estimated losses were 60 million euros in 2007. The models were applied to some of the most agriculturally relevant irrigation districts in Spain.Additional key words: drought management; irrigation; stochastic models; water productivity; water supply instability. ResumenCómo vincular la productividad agrícola, la disponibilidad de agua y demanda de agua en un contexto de riesgo: un modelo para gestionar los riesgos hidrológicos La importancia de la sequía sobre la agricultura de regadío es el fundamento de este artículo que analiza y evalúa el riesgo de escasez de agua sobre el resultado económico de este tipo de agricultura. El objetivo es controlar en tiempo real dicho riesgo. Se estiman diversos modelos de regresión que explican la productividad del regadío a través de un índice de precios ponderado para los principales cultivos, la tendencia y la disponibilidad de agua. Estos modelos, que se corrigen por auto-correlación, muestran una buena capacidad explicativa. En segundo lugar se llevan a cabo simulaciones ex-ante de la productividad del regadío empleando funciones ajustadas del balance de agua. Este marco metodológico proporciona la base para un sistema de gestión del riesgo de sequía en tiempo real a través de funciones de distribución de los resultados económicos esperados, que pueden ser revisadas de manera mensual antes del inicio de la campaña de riegos. Los resultados de la simulación demuestran que se pueden anticipar los efectos de las sequías, y por tanto, servir a los gestores del agua como complemento de los modelos hidrológicos para gestionar las reservas de agua en los años de escasez. Se identifican diferentes perfiles de riesgo...

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“…The maximum evapotranspiration (ETmax) was calculated from the reference evapotranspiration (ETo) for all crops with the dual crop coefficient approach (Allen et al, 1998;Allen, 2000;Lorite et al, 2004a;García-Vila et al 2008):…”

Section: Crop Water Requirement To Maintain the Optimal Soil Water Comentioning

confidence: 99%

Untitled

2014

IJAPR

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A study of the assessment of the irrigation water use has been carried out in the Spanish irrigation District "Río Adaja" that has analyzed the water use efficiency and the water productivity indicators for the main crops for three years: 2010-2011, 2011-2012 and 2012-2013. A soil water balance model was applied taking into account climatic data for the nearby weather station and soil properties. Crop water requirements were calculated by the FAO Penman-Monteith with the application of the dual crop coefficient and by considering the readily available soil water content (RAW) concept. Likewise, productivity was measured by the indexes: annual relative irrigation supply (ARIS), annual relative water supply (ARWS), relative rainfall supply (RRS), the water productivity (WP), the evapotranspiration water productivity (ETWP), and the irrigation water productivity (IWP).The results show that in most crops deficit irrigation was applied (ARIS<1) in the first two years however, the IWP improved. This was higher in 2010-2011which corresponded to the highest effective precipitation Pe. In general, the IWP (€.m -3 ) varied among crops but crops such as: onion (4.14, 1.98 and 2.77 respectively for the three years), potato (2.79, 1.69 and 1.62 respectively for the three years), carrot (1.37, 1.70 and 1.80 respectively for the three years) and barley (1.21, 1.16 and 0.68 respectively for the three years) showed the higher values. Thus, it is highlighted they could be included into the cropping pattern which would maximize the famer's gross income in the irrigation district.

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Management trends and responses to water scarcity in an irrigation scheme of Southern Spain

Cited by 67 publications

References 30 publications

The Environmental Costs of Water Flow Regulation: an Innovative Approach Based on the ‘Polluter Pays’ Principle

The Environmental Costs of Water Flow Regulation: an Innovative Approach Based on the ‘Polluter Pays’ Principle

How to link agricultural productivity, water availability and water demand in a risk context: a model for managing hydrological risks

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