Long-Term Operation of Irrigation Dams Considering Variable Demands: Case Study of Zayandeh-rud Reservoir, Iran
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 5
Abstract
Dependency of water demands on the climate variation occurs especially in regions where agricultural demand has a significant share of the total water demands. The variability between demands that are based on annual climate conditions may be larger than the uncertainty associated with other explanatory variables in long-term operation of an irrigation dam. This paper illustrates certain benefits of using variable demands for long-term reservoir operation to help manage water resources system in Zayandeh-rud river basin in Iran. A regional optimal allocation of water among different crops and irrigation units is developed. The optimal allocation model is coupled with a reservoir operating model, which is developed based on the certain hedgings that deals with the available water and the water demands mutually. This coupled model is able to activate restrictions on allocating water to agricultural demands considering variation of inflow to the reservoir, variation of demands, and the economic value of allocating water among different crops and irrigation units. Using this model, long-term operation of Zayandeh-rud dam is evaluated considering different scenarios of inflow to the reservoir as well as agricultural demands. The results indicate that the use of operating rules which consider variable demands could significantly improve the efficiency of a water resources system in long-term operation, as it improves the benefit of Zayandeh-rud reservoir operation in comparison with conventional water supply approaches.
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Acknowledgments
The writers would like to thank the constructive comments received from Professor Ghumman and anonymous reviewers. Their comments were very helpful for improving the paper.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 5 • May 2010
Pages: 309 - 316
Copyright
© 2010 ASCE.
History
Received: Oct 2, 2008
Accepted: Jun 19, 2009
Published online: Jun 25, 2009
Published in print: May 2010
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