(Erosion Prediction in Ungauged Basins: Integrating Methods and Techniques (Proceedings of Symposium HS01 held during IUGG2003 at Sapporo, July 2003), IAHS Publication No. 279, 2003, pp. 180187).
This study deals with determining land-use scenarios that will assist in reducing sedimentation at a dam site. The study site is the contributing basin of the Bili-Bili Dam, South Sulawesi, Indonesia. The land-use scenarios were formulated by using an erosion model built within a Geographic Information System framework. Input data for the model were collected using aerial photographs, satellite imagery and direct observation. Seven land-use scenarios were developed for evaluating the most suitable land use within the drainage ba-sin.The model results show that the basin without conservation generates 1473.04 m3 km–2 year–1 of sediment. The fourth scenario (with conservation) can potentially reduce sediment to approximately 1022.72 m3 km–2 year–1, which is lower than the dead storage of Bili-Bili Dam. It is recommended that this sedimentation rate be maintained in order to reach the design life of 50 years for this dam. Based on this work, it was also determined that the existing land-use framework implemented by the local government (Gowa Regency) generates erosion rates higher than the tolerable soil loss (TSL). It is therefore suggested that the existing land use should be modified according to the scenarios developed in this work.
Bili-Bili dam, Erosion, GIS, Indonesia, Jeneberang basin, Land use, Reservoir, Sediment, Sulawesi, Tolerable soil loss
