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Nowadays, the sustainable management of the available water resources is more and more important to attain a competitive agriculture, especially in zones like Castilla-La Mancha with a large territory and very important agriculture within the regional economic activity.

Since, there was a necessity to study the irrigation planning under multidisciplinary conditions, in 1996 it was established a collaboration between Agricultural Regional Government and Centro Regional de Estudios del Agua (CREA) of the University of Castilla-La Mancha, for providing technical advisory in the decision-making for irrigation subject in definite interesting zones of the region. This study presents the most important aspects of this collaboration and, as an example, the results obtained in the improvement and modernization study of a zone (Sta. Cruz de Moya, localized in a disadvantaged mountainous area).

The execution grade of the studies has been different for both: new transformation irrigation lands, and traditional irrigations, depending on the population and social characteristics of each zone. On the other hand, the mean cost of the transformation varies from 1150 and 5000 /ha, depending on the different working hypothesis.