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Determining optimum reliability for supplying agricultural demand downstream of a reservoir using an explicit method with an economic objective function

Sheibani, Hossein, Shourian, Mojtaba
Water resources and economics 2019 v.26 pp. 100131
irrigation systems, issues and policy, models, Iran
To date, various simulation and optimization models have been proposed for optimum design of the reservoirs and the downstream irrigation network systems. In most of these models, the minimum reservoir capacity is defined as the objective function that can supply the defined agricultural demands based on a predetermined assumed reliability level. However, the objective functions of minimizing the reservoir capacity may not find the optimum solution economically. In this study, an optimization model for design of a reservoir and the irrigation network is developed with the objective function of maximizing the net benefit gained from the system. The results are presented for two operation policies of S-type and SQ-type which are common linear decision rules (LDR) for the reservoirs. Chance-constrained (CC) stochastic optimization with linear decision rules (LDRs) are presented in this study.The discussed model which is a deterministic explicit optimization model for a single reservoir and the downstream irrigation network is applied for the Marboreh dam in Iran with the aim of extraction of the optimum reliability level for supplying the agricultural demands. Results indicate that the optimum reliability level is about 50% for the S-type and SQ-type rules in the case studied.