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Climate change has caused numerous problems to management of water resources. Similar to many other countries Iran is also facing water crisis in most of its catchments. As one of the agricultural centers of this region, Dez basin may be affected by the impacts of this climate change. Approximately 4 billion cubic meters of water of this basin is consumed by the agriculture sector on a yearly basis, but the low efficiency of irrigation networks in this region leads to the loss of millions of cubic meters of water each year. Continuation of the current trend will evidently cause serious problems to the supply of water and agricultural future of this region. One of the actions for overcoming these problems involves increasing irrigation efficiency. In this paper, by simulating Dez basin, as an integrated water resource system, the effects of increasing the irrigation efficiency on the reliability of agricultural water from Dez basin were analyzed. The study scenarios consisted of shortand long-term changes of consumption level and management scenarios including a 10% and 20% increase in irrigation efficiency. The combination of these scenarios was simulated in WEAP. Results of the research have been discussed in both short-and long-term. th Annual Meeting of International Commission on Large Dams