Most of water quality problems in reservoirs are associated with inflow load from the watershed during flood events. One of these problems is long duration of high turbidity. In recent years, several trials of flexible dam operation for environmental improvement have been made. In this study, we tried to evaluate effects of changing flood water outlet operation for discharging inflow load, especially first flush, efficiently. For this purpose, a numerical model combined with a reservoir hydrodynamic and particle tracking model was developed, and this model was verified through comparison with field data during flood. Effect of dam operation changes were evaluated in terms of sediment particle discharge ratio by using the model and it was observed early discharge had an effect to some extent.
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