Abstract
Way Ela dam is a dam to be built in the Negeri Lima village. In the negeri lima village there was also a dam that formed naturally by landslide due to high rainfall on 13 July 2012. A year after it was formed, on 25 July 2013 flooding occurred due to an extreme rainfall that caused the failure of the natural dam. The event of the failure on 2012 generated flood that severely damaged houses and various public facilities to negeri lima village down toward to the coast. As a result of this event, a small-scale reservoir is formed. The Government plans to utilize the established reservoir to build the new Way Ela Dam. This study was conducted to analyze floods with scenarios in the event of a failure in the new Way Ela Dam. The overland flow is simulate with two dimensional numerical model HEC-RAS v.5. Determining strategies for mitigation needs to be assessed comprehensively, by simulating disaster scenarios on the dam, analyzing the impacts and then planning recommendations for disaster risk. The results are expected to be a reference for mitigation plans for the new Way Ela Dam.
Highlights
Way Ela Dam is a dam to be built in the Negeri Lima village
The analysis of flood propagation due to dam break scenario of Way Ela Dam is conducted in order to predict the flood inundation, flood depth and flood arrival time on the negeri lima village so that it can be anticipate and reduce the human-economic losses
Probable maximum precipitation (PMP) is a theoretical concept that is widely used by hydrologists to arrive at estimates for probable maximum flood (PMF) that find use in planning, design and risk assessment of highhazard hydrological structures such as flood control dams upstream of populated areas. [8]
Summary
Way Ela Dam is a dam to be built in the Negeri Lima village. In the negeri lima village there was a dam that formed naturally by landslide due to high rainfall on 13 July 2012 [1]. This study was conducted to analyze floods due to dam break scenarios in the new Way Ela Dam which can be used as a guide or input in the preparation of emergency action plan documents. The numerical model 1d for dam break has not been able to accurately determine the flood propagation due to the dam failure. The model was applied for simulating Way Ela Natural Dam Failure [5] Ujjani Dam Break [6] and Montecello Dam Breach [7] with a good result. The analysis of flood propagation due to dam break scenario of Way Ela Dam is conducted in order to predict the flood inundation, flood depth and flood arrival time on the negeri lima village so that it can be anticipate and reduce the human-economic losses. The dam break itself is simulated by using HEC-HMSv.4.2.1 with four scenarios as follows: 1) Overtopping; 2) Top Piping; 3) Middle Piping; 4) Bottom Piping
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