In this study, the drought contingency plans of reservoir operation rules were developed to mitigate drought risks and satisfy the water demand. Drought contingency plans are the triggering criteria and guideline for initiation and termination of drought response stages and consist of two criteria (standard daily water levels (or volumes) and release rules by five levels of drought response stages; normal water supply, mild water shortage, moderate water shortage, severe water shortage, emergency and water shortage). Five sets of standard daily water volumes are constructed and satisfied the water supply reliability of 95% for water demand at each five level of drought response stages. As a result of application to five multi-purse dams in Nakdong River Basin, it is found that each dam could preserve the high water levels during historical periods and mitigate the past severe drought. However, the future water supply reliability ranges from 99% to 65% depending on AR5 RCP climate change scenarios. It means that the reservoir operation rules are not sufficient and need to modify for future inflow conditions based on the AR5 RCP climate change scenarios.
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