In this study, MIKE BASIN has been used as a decision support tool for irrigation management and water sharing of Rangawan reservoir, an interstate project of Madhya Pradesh and Uttar Pradesh in India. The water sharing and optimum irrigation releases have been analyzed by developing two separate models in decision support tool; the first model computes irrigation demand and offers inputs to the second model, which calculates water supplies and deficits as per the water sharing agreements between the two states. The models have been used to generate twelve different scenarios for evaluation of irrigation demands, water supply, and demand deficit/excess for actual cropping pattern in command of Madhya Pradesh part. Simulated results showed, in average/wet rainfall year with conveyance efficiency of 60% and application efficiency of 70%, the irrigation demand of 11.83？Mm3 has been found satisfying without any deficit. By improving efficiencies, conjunctive use, and managing irrigation supplies as recommended from scenarios of DSS application, more areas in the command can be brought under irrigation. The developed models can be used for real time reservoir operation and irrigation planning under variable climatic conditions, conveyance and application efficiencies, consumptive use of surface and groundwater, and probable runoff and cropping pattern. 1. Introduction Reservoir operation involves many decision variables and multiple objectives as well as risk and uncertainty. In addition, conflicting objectives lead to significant challenges for operators in making operational decisions. Traditionally, fixed reservoir rule curves are used for guiding and managing the reservoir operation. These curves specify reservoir releases according to different controls such as current reservoir levels, hydrological conditions, water demands, and time of a year. Established rule curves, however, are often not very efficient for balancing the demands of different users [1–3]. Optimization and simulation of reservoir system are preferred methods in reservoir operation and irrigation management. Optimization is a powerful technique that helps to analyze complex water resource system for obtaining the most economical/viable solution. In many situations, decision makers would be interested in examining a number of scenarios rather than just looking at one single solution that is optimal [4]. Thus, there is a potential for improvement of reservoir operating policy with the help of optimization or development and examination of scenarios. Various operating models and decision
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