DefinePK

Abstract

The Bili-bili multi purpose dam was commenced since 1992 and completed in 1999. The location of Bili-bili dam is at south east of Makassar city, about 31 km from the river mouth of Jeneberang River and about 1.6 km of the confluence of the Jeneberang and the Jenelata rivers. This project comprised Sabo dams in upstream reaches from Bili-Bili reservoir, and 5 (five) units, sand pocket of which serves as a sediment control structure and sand mining location. On March 26, 2004, the gigantic collapse of the Sorongan ridge (caldera of mount Bawakaraeng), which is the headwaters of Jeneberang river. This experimental study of flow behavior at sand pocket shown that even the velocity of the flow not too high the hydraulic jump caused the very deep of scouring, as the hydraulic jump not occur in the stilling basin, but in the downstream of the sand pocket , at the apron. To prevent the very deep scouring, at the downstream, the level of the apron must be constructed lower , and the rip rap construction must be implemented.