Bili‐bili Dam located in Sulawesi Selatan, Indonesia was built as a multipurpose dam. However, it has lost its sediment capacity by deposit resulted from the collapse of Mt. Bawakaraeng. Since then, there has been a criticism that the construction of Bili‐bili Dam was not appropriate at the very place. Without Bili‐bili Dam, sediment in the river by the collapse would have possibly triggered serious sediment disasters in downstream areas. We evaluate effectiveness of Bili‐bili Dam as a sabo dam which prevents sediment from flowing downstream. We simulate one‐dimensional riverbed variation of the Jeneberang River and two‐dimensional flood in the downstream areas of Bili‐bili Dam. The results of one‐dimensional riverbed variation simulation show that 22million m3 of sediment would flow downstream in twenty years and the riverbed would rise up to 10m. The results of two‐dimensional flood simulation show that the floodwater would inundate 68km2 of the areas including highly populated residential areas. Therefore, Bili‐bili Dam functions effectively as a sabo dam.

Key words：Bili‐bili Dam, sediment transport, riverbed variation, flood simulation