BYPASS CHANNEL AS A CONTROL FOR QUANTITY AND QUALITY OF WATER THAT ENTER THE WEST COASTAL RESERVOIR IN THE NCICD/IFSP 2019 MASTERPLAN

• Main Author: Hatuaon Marpaung, Aron
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/54429
• Institution: Institut Teknologi Bandung

In various master plans for Jakarta Bay flood control since NCICD in 2014 to IFSP in 2019, it is shown that the Coastal Reservoir (CR) become an important component to be built. The problem is that the CR in the master plan is a closed system, so that regardless of the volume of river water going into the CR, it cannot be diverted to another place by gravity. As a result, a large capacity of pump is required to remove excess water. If the pump is damaged, even though the gate is available, the gate connected with the roller gate and shiplock, making it complicated to operate and the CR is vulnerable to seawater intrusion. The condition that cannot be prevented is the quality of the incoming river water that being polluted during an environmental disaster, then the polluted river water flowing to the system. Learnt from the Lake Shiwa in South Korea disaster, for the pre-design stage B of IFSP 2019, a bypass channel (BC) is recommended. By regulating the quantity and quality of water in BC, CR water quality is more guaranteed and the pump operating costs will not be needed because the unnecessary water can be flowed directly to the sea. To prevent flooding that will occur on the reclamation island at (+) 2.00 m, it will need 3 doors in BC. The maximum water elevation of BC when the peak discharge of Cengkareng Drain and BKB reaches (+) 0.96 m. If the CR is simulated to experience a dam break, the maximum water elevation BC (+) is 0.80 m.