The effect of debric flow on sediment control buildings in jeneberang river

The Bili-Bili Reservoir, which is one of the largest reservoirs in South Sulawesi Province, is located in the middle of the Jeneberang watershed and was inaugurated in 1999. This reservoir is a multipurpose reservoir built with the purpose of flood control, fulfillment of irrigation water needs, raw water supply and hydroelectric power plant. The Bili-Bili multipurpose reservoir was built with the intention of controlling damaged power, optimizing the management and utilization of water resources in the upper reaches of the Jeneberang Das. However, in the latest developments there has been a decline in utilization of the reservoir service function due to changes in reservoir conditions due to erosion due to changes in land use (Tangkaisari, R. 1987) and also the caldera wall avalanche in 2004 which was upstream of Das Jeneberang (LPM UNHAS. 2004). The sedimentation prevention process cannot be carried out as there is still water flowing in the river, but the sedimentation process can be slowed down. To soften the sedimentation process, data is needed regarding the type of sediment produced and the method of transportation, location, volume, intensity of evolution of the riverbed, rain, river discharge and so on. One effort to slow down the sedimentation process is by building sediment control buildings. Sediment control buildings function to slow down movement and gradually reduce the volume of sediment. Existing sediment control buildings need to be evaluated to determine whether sediment is still capable or not, because over time and the high intensity of rainfall is one of the causes of sedimentation.