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All Journal RACIC : Rab Construction Research Media Ilmiah Teknik Sipil
Bramantyo Herawanto
Universitas Diponegoro
Civil Engineering, Building, Construction & Architecture

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Penilaian Risiko Kegagalan Bendungan Dan Tindakan Pengurangan Risiko Pada Bendungan Nglangon: Risk Assessment Of Dam Failure And Risk Reduction Measures At Nglangon Dam Bramantyo Herawanto; Suripin Suripin; Dyah Ari Wulandari
Media Ilmiah Teknik Sipil Vol. 11 No. 1 (2023): Media Ilmiah Teknik Sipil
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mits.v11i1.4071

Abstract

The dam failure that has been operating has a great potential to occur if the administrator does not carry out proper maintenance. Dams require proper and correct maintenance and operation which will greatly affect the safety of the dam itself. Especially for dams that have been operating for a long time, major maintenance activities including repairs and rehabilitation are urgently needed to avoid the worst conditions such as facing natural disasters. Because a dam can cause a large impact if it fails, it is necessary to have a risk assessment to analyze and evaluate the hazard of the dam. Risk research conducted at the Nglangon Dam uses the event tree method, traditional and modified ICOLD. Based on the results of individual and group extreme probability analysis, both traditional and event tree methods, the risk probability value is above the acceptable risk value threshold of 1.00E-05, which means that the Nglangon Dam requires further action. This is in line with the results of the ICOLD modified risk assessment method with classification III (high) which means that the Nglangon Dam is included in a dam that requires special attention and corrective actions to reduce the level of risk in the Nglangon Dam
PENINGKATAN KINERJA WADUK KEDUNGOMBO DENGAN MENGEMBALIKAN KAPASITAS TAMPUNGANNYA bramantyo herawanto; Suripin Suripin; Dyah Ari Wulandari
Racic : Rab Construction Research Vol. 8 No. 1 (2023): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v8i1.2817

Abstract

In every reservoir plan, the volume of dead storage provided is always taken into account to accommodate sediment entering the reservoir during the service life of the reservoir. Several studies on reservoir sedimentation show that 70% of reservoirs have sedimentation problems so the effective life of the reservoir will end before the design life is reached. The rate of sediment entering the reservoir will settle in the dead reservoir and the effective reservoir which will affect the performance of the reservoir. Therefore, it is necessary to take measures to improve the performance of the reservoir, one way is to restore its effective reservoir. Based on the results of bathymetry measurements of the Kedungombo Reservoir from 1989 to 2017, the sediment rate was 1.954 million m3/year. From the analysis of sediment distribution, the dead reservoir of the Kedungombo Reservoir at an elevation of +65.00 will be filled in 2089. The effective reservoir in 2089 at a normal water level of +90.00 of 527.71 million m3 has decreased by 106.89 million m3 from the initial effective reservoir is 634.6 million m3. To improve reservoir performance by restoring its effective reservoir, the Kedungombo Reservoir requires an elevation of the overflow or normal water level as high as 2.26 m with an inundation area of ​​48.72 million m2. Keywords: Sediment Distribution, Storage Capacity, Reservoir Performance, Kedungombo Reservoir
Co-Authors Dyah Ari Wulandari S. Suripin