Hydraulics simulation of rubber dam for operasional and emergency respond guidelines in West Flood Canal, Semarang, Indonesia
Wahyudi S.I., Adi H.P., Nurcahyani I.
Abstract
West Flood Canal (KBB) is a flood control river in the middle & west areas of Semarang, Central Java, Indonesia. A rubber dam is being built at downstream of the River to prevent sea water intrusion and facilitate rowing. There is permanent dam at upstream the river, Simongan dam, which is approximately 2 km away. The operation of rubber dam is controlled from the water elevation in Simongan dam. It is necessary to simulate the hydraulics of the water condition between the rubber dam and Simongan dam. The research aims to simulate several scenarios of emergency conditions in rainy season and compile parameters for rubber dam operation and parameters for early warning system. The methods of the research are survey, observation and field measurement. The hydraulics simulation is conducted with the help of HEC-RAS program with validation of field observation and measurement. The result of the research is used for operational rubber dam guidelines in two conditions which must be considered by rubber dam operator. During the existing condition, the rubber dam was upfront when the water level above the Simongan dam Spillway 1.4 m with a flood discharge of 199.20 M3 / sec. Then after normalization the rubber dam could be opened when the water in the Simongan weir reached 3.30 m or flood discharge was 740 m3 / sec. A live-stream observation instrument will be installed in the next research to facilitate the rubber dam operation and validation of more detailed simulation result.
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