This paper presents two optimization models developed for the derivation of operation policies for a reservoir when the quality considerations are important besides satisfying the quantity requirement. In one model only the releases are controlled. In the other model both inflows and releases are controlled. Reservoir operational policy is based on the Incremental Dynamic Programming technique. Complete mixing is assumed to be occurring in the reservoir throughout the year. The models are applied to a reservoir on the Shapur river in Southern Iran. The results obtained from the models show their potential in improving the quality of water supplied from a reservoir. The improvements obtained by manipulating both inflows and releases are observed to be higher than the ones achieved by simple release control.

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