Seite - 547 - in Book of Full Papers - Symposium Hydro Engineering

Jakarta as the Special Capital Region of Indonesia has an area of approximately 661.52 km². Jakarta have a big issues to manage the river, with ‘too much water’, ‘too little water’ and ‘too dirty water. Too much water, because every year it were hit by the worst flooding. Too little water, because we have varied rainfall distributions from the wettest (> 4,000 mm/year) to the most drought (< 800 mm/year) and very difficult to fulfill a demand of water supply because the population in the Greater Jakarta is rapidly increase, but the quantity and continuity of water supply is very limited. Too dirty water, because many people (mostly the low incomes) live on the river banks even on the middle of the river, the worst thing from the people who live along the river rely on its use for daily necessities including cooking, cleaning and washing, the river is increasingly being used as a place to dispose of trash and inorganic waste materials. The problem of Jakarta during the rainy season is flooding in several places in the Ciliwung river basin. Based on the masterplan of flood control in Jakarta, planned to be built Ciawi Dam and Sukamahi Dam which will be useful as flood control, this dam is located in the upper Ciliwung river. Fig. 1 The Masterplan Of Flood Control In Ciliwung River Ciawi Dam designed as dry dam, it equipped tunnel without a gate to control the flood. The Dam type is random zone with height 55 meters from bottom fondation, and total volume 6,45 million m3. Sukamahi Dam will be build in Sukabirus river and planned to be build using straight core in the middle, with random zone on shoulder. Sukamahi Dam height 50 meters measured from bottom of the deepest foundation excavation, top Dam elevation + 601 meters with 9 meters width and 198 meters length. Ciawi Dam and Sukamahi Dam are constructed to support flood control system of Jakarta. 547