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Penilaian Indeks Risiko Metode Modifikasi Andersen dan Metode Modifikasi ICOLD untuk Bendungan Palasari, Bendungan Gerokgak dan Bendungan Benel Zakariya Ahmad Aji Pamungkas; Hari Nugroho; Kresno Wikan Sadono
Jurnal Serambi Engineering Vol 8, No 1 (2023): Januari 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i1.5361

Dams are infrastructure that have potential hazards if they are not monitored and maintained. The potential hazard of a dam can be identified through a risk assessment. Risk assessment can consist of risk analysis and risk evaluation. The Palasari Dam, the Gerokgak Dam and the Benel Dam were built to be used to supply water to the northern part of Bali Island. This study aims to determine the level of risk posed by the three dams. Dam risk assessment in the study used the modified ICOLD method and the Andersen modified method. The results of the risk assessment are the basis for consideration in determining maintenance and repair priorities. The results of the dam risk index assessment study, using the Andersen modification method, Palasari Dams, Gerokgak Dams, and Benel Dams have a "Satisfactory" classification based on the safety value of the dam. Whereas with the modified ICOLD method the Palasari Dam and the Gerokgak Dam has a "High" risk classification, and the Benel Dam have a "Medium" risk classification.

Analisa Kebutuhan Instrumentasi Geoteknik Dry Dam Bendungan Sawangan Kabupaten Minahasa Utara Farhan Zaky; Hari Nugroho; Sutarto Edhisono
Borneo Engineering : Jurnal Teknik Sipil Volume 7 Nomor 2 Tahun 2023
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v7i2.3661

Located in the downstream watershed, Manado city is at risk of hydrometeorological disasters such as flooding every year, especially in conjunction with high tides. One solution to the city's flooding problem is to provide flood water storage by building the Sawangan dry dam in North Minahasa Regency. In building a dam, dam safety is a very important requirement to minimize disaster risks for the community such as property losses and damage to infrastructure downstream of the dam. Dam safety is highly dependent on the accuracy of planning and during construction. The safety of a dam also depends on the operation stage, the implementation of maintenance, as well as intensive and continuous supervision, monitoring the behavior of the dam and its building facilities. The purpose of the geotechnical instrumentation analysis study of Sawangan Dam in North Minahasa Regency is to determine the ideal geotechnical instrumentation needs in the process of optimal and periodic observation of dam behavior. Geotechnical parameters affect dam behavior due to soil strength related to pore water pressure, water seepage, deformation characteristics of foundation and embankment materials during construction and after construction. Determination of the amount of geotechnical instrumentation installed at Sawangan Dam is based on technical data of the dam dimensions. Based on the analysis conducted, the required geotechnical instrumentation components are; pore water pressure gauges, dam deformation gauges installed inside and outside the embankment, groundwater level gauges, seepage gauges, reservoir water level gauges, and other supporting components. By installing geotechnical instrumentation using telemetry systems or integrated computer systems, data acquisition, management and security are easier.

Penilaian Indeks Risiko Metode Modifikasi Andersen dan Metode Modifikasi ICOLD untuk Bendungan Palasari, Bendungan Gerokgak dan Bendungan Benel Zakariya Ahmad Aji Pamungkas; Hari Nugroho; Kresno Wikan Sadono
Jurnal Serambi Engineering Vol 8, No 1 (2023): Januari 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i1.5361

Dams are infrastructure that have potential hazards if they are not monitored and maintained. The potential hazard of a dam can be identified through a risk assessment. Risk assessment can consist of risk analysis and risk evaluation. The Palasari Dam, the Gerokgak Dam and the Benel Dam were built to be used to supply water to the northern part of Bali Island. This study aims to determine the level of risk posed by the three dams. Dam risk assessment in the study used the modified ICOLD method and the Andersen modified method. The results of the risk assessment are the basis for consideration in determining maintenance and repair priorities. The results of the dam risk index assessment study, using the Andersen modification method, Palasari Dams, Gerokgak Dams, and Benel Dams have a "Satisfactory" classification based on the safety value of the dam. Whereas with the modified ICOLD method the Palasari Dam and the Gerokgak Dam has a "High" risk classification, and the Benel Dam have a "Medium" risk classification.

EVALUASI PERILAKU DEFORMASI VERTIKAL BENDUNGAN SERMO BERDASARKAN DATA INSTRUMENTASI GEOTEKNIK Rizka Sartika Hutami; Hari Nugroho; Sutarto Edhisono
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.v8i1.2813

The vertical deformation of the dam is one of the important parameters to be evaluated both during the construction and post-construction periods. Abnormal deformation behavior can cause various problems that threaten the safety of the dam. Evaluation is very important to do, especially on the Sermo Dam which has been loaded for more than 25 years to knows its behavior. Identification of abnormal behavior is done by evaluating the results of the vertical deformation analysis based on the instrumentation reading data against the acceptance criteria. In the construction, the vertical strain value compared with the depth below crest value resulted in abnormal behavior. However, evaluation of the settlement that occurs results in normal behavior. In the post-construction, evaluation with Sherard (1965) and ICOLD (1993) criteria resulted in abnormal conditions at certain elevations. However, evaluation based on the settlement index and acceptance criteria of Sowers (1965) and Hunter and Fell (2003) resulted in normal conditions.

PENGEMBANGAN PENGELOLAAN MATERIAL SEDIMEN PADA SPOILBANK WADUK SUTAMI Tri Pambudi; Hari Nugroho; Suripin
Racic : Rab Construction Research Vol. 10 No. 1 (2025): JUNI 2025
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i1.5657

The Sutami Dam is a multi-purpose dam currently managed by Perum Jasa Tirta 1. It is located in Karangkates Village, Malang Regency. Dredging activities in the Sutami Reservoir have led to new issues, particularly the sediment material resulting from the dredging process. The existing spoilbank capacity is still inadequate to meet the volume of material that needs to be dredged annually. Therefore, there is a need to develop the management of sediment material in the Sutami Reservoir’s spoilbank. This research is conducted to evaluate the sediment drying methods, assess the safety factor of embankment slope increases, and determine the volume increase in the spoilbank capacity. The data used in this study are sourced from soil parameter tests conducted by Perum Jasa Tirta 1, including grain size analysis and hydrometer analysis. The results of this study show that the most suitable dewatering method for sediment material management at Sutami Reservoir is Mechanical Dewatering (Filter Press). With the implementation of sediment management treatment, the embankment slope can be raised up to 9 meters at a 1:1 slope with a safety factor of 1.255. As a result, the potential increase in the spoilbank's holding capacity for one year is estimated to be between 2.016.500 – 2.303.800 m³ per year

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