Abstract
Flooding is an obstacle for water infrastructure which installed in a river system in Ciliwung, West Java, Indonesia. The climate change triggers unpredictable rainfall which occurs in the watershed, therefore the vulnerability of river and other infrastructures are alarming. The rehabilitation and maintenance strategies are needed to make water infrastructures in the river system obtain lower damage. The research aims to simulate the 2-D HEC-RAS modelling of river system and stability. The result produces the water level of the river even in 1000-year discharge flood. Also, the research proposes the earth embankment dam for flood reduction in the watershed. The dam is designed according to the ideal condition. The simulation of HEC-RAS shows that the river experiences flooding in a certain condition. Besides, the research concludes that designed dam could overcome the flooding problem and suitable strategy for water infrastructure maintenance towards flooding impacts. Further investigation towards soil data for designed dam should be further analyzed to obtain better and comprehensive understanding.
Highlights
Ciliwung River watershed is one of 13 watersheds that are in critical condition due to land-use change
There has been a change in the use of land use from forests, technical rice fields, and rain-fed rice fields, which has become a residential area of ± 300 ha
The impact of land-use change on river flow is reflected by an increase in the maximum average daily flow of the Ciliwung River in 1989 - 1999 and a decrease in the average daily minimum flow of the river so that the water balance is disturbed
Summary
Ciliwung River watershed is one of 13 watersheds that are in critical condition due to land-use change. The upstream Ciliwung watershed covers an area of around 14,900 hectares located in Bogor Regency and is included in a mountainous area with an elevation of ± 2000 meters above sea level In this region, it is generally culled by the swift flow of floods during the rainy season, which causes downstream areas such as Bogor City and DKI Jakarta Province to experience flooding submissions from the upstream of the Ciliwung watershed. It is generally culled by the swift flow of floods during the rainy season, which causes downstream areas such as Bogor City and DKI Jakarta Province to experience flooding submissions from the upstream of the Ciliwung watershed This region has a high slope variation above 45%. The impact of land-use change on river flow is reflected by an increase in the maximum average daily flow of the Ciliwung River in 1989 - 1999 and a decrease in the average daily minimum flow of the river so that the water balance is disturbed
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