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Sutami Reservoir is located in Malang, East Java, Indonesia, is a multi-use reservoir to supply water for hydropower plant, agricultural irrigation, industry, communities and flood control. The functional of Sutami reservoir is decreasing over time caused by the reduced of reservoir capacity as a result of increasing in sedimentation rate every year. If this problem is not handled properly, it can be causing the failure of reservoir function. Various efforts have been done to overcome the causes of sedimentation in the upstream part of the reservoir intensively and sustainably. An innovative step is needed to increase the storage volume of Sutami reservoir. This step is to extend the lifespan of the reservoir. There are several alternative actions which can be taken, but this is still a polemic among experts and stakeholders. This is because many conflicts in criteria which are taken into consideration. This study aims to determine the priority order of proposed alternative actions through the multi-criteria decision making process using the Analytical Hierarchy Process (AHP) method. AHP allows uniting the subjective qualitative assessments of individuals through importance-level pairwise comparisons into an assessment of group decision making. Weighting result of the pairwise comparisons using Social, Environmental, Technical, and Economic aspects as a criterias are as follows: the alternative of heightening the dam body by 5m is the top priority with the weight of 36.2%. The alternatives heightening the spillway by 0.5m is the second priority with a weight of 25.7%, the alternative of dredging sediments as much as sediment inflow in the third priority with a weight of 20.5% and the last priority is the status quo a weight of 17.7%.

The decision making analysis of increasing storage capacity of sutami reservoir with Analytical Hierarchy Process (AHP) approach