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All Journal Jurnal Ilmiah Rekayasa Sipil
Sadtim Sadtim
Jurusan Teknik Sipil, Politeknik Negeri Padang
Civil Engineering, Building, Construction & Architecture

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Analisis Kapasitas Penampang Sungai Batang Mahat Terhadap Besaran Debit Banjir Menggunakan Pendekatan Model Matematik Dalrino, Dalrino; Sadtim, Sadtim; Hartati, Hartati; Agus, Indra
Jurnal Ilmiah Rekayasa Sipil Vol 15 No 2 (2018): Oktober 2018
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (772.907 KB) | DOI: 10.30630/jirs.15.2.124

Abstract

Batang Mahat watershed has a total area of 772.87 km2 with a total length of the main rivers around 44.06 km. With the topographic condition on the upstream side was a mountainous terrain and steep slope relatively into downstream. The problem was can be classified as river siltation, narrowing of the river, and riverbank erosion that has caused flood and threaten a public facilities. Numerical simulations using the application of the HEC RAS model were conducted to determine the capability of the river storage capacity into various discharge values. The results of the analysis show that with the discharge condition Q2 there has been flood caused by the high surface elevation of water that was overtopping of the left and right embankments elevation at the upstream and midstream areas. The water surface elevation will increase with the increasing of flood discharge. River normalization efforts with additional depth and widening of river channel were recommended.
Analisa Kedalaman Gerusan di Batang Bangko akibat Banjir Bandang Tahun 2016 Ihsan, Afif Kumala; Marceli, Fidela Erina; Herdianto, Revalin; Sadtim, Sadtim
Jurnal Ilmiah Rekayasa Sipil Vol 21 No 1 (2024): April 2024
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jirs.v21i1.1109

Abstract

B Bangko River is one of tributaries in Batanghari River Basin that is originated from Solok selatan Regency. Bangko River had a flash flood on February 8th, 2016 that resulted in vast destruction of paddy field, residences, bridges, and flood plain. At several points along the river, some changes in river morphology were observed. These changes triggered some concern on safety of buildings and residencies along the riverbanks. Hence, there was a need of a study on changes of river behavior laterally and vertically for structural as well as non-structural measures to control morphological changes of the river. This study aims to find scour depth in current conditions due to various discharge schemes that might occur in Batang Bangko. Scour depth was analyzed using Lacey Channel Regime theory, Blench equation (1969), Blodgett equation (1986), and Pemberton dan Lara equation (1984). Design rainfall was calculated using data from Padang Aro and Muaro Labuh rainfall station from year 2007-2021. Sediment gradation was analyzed at laboratory of Civil Engineering Departement, Politeknik Negeri Padang. The results of scour depth from formulas were compared with actual scour depth of Bangko River. The analysis revealed that with Q25 of 492 m3/s results in scour depth of 1,402 m (Lacey Formula (Novak, ET AL., 2007); 0,588 m of Blench formula, 1,535 m of Lacey formula (R.J. Garde, 2006); 1,361 m of Lacey formula (Direktorat Jendral Sumber Daya Air, 2013). This study concluded that actual scour of 1.1 m is the nearest to Lacey formula (Novak, ET AL., 2007).
Evaluasi Kapasitas Eksisting Sungai Batang Mangor di Hulu Bendung Ladang Laweh Dengan Peningkatan Debit Banjir Rencana 25 Tahun Hartati, Hartati; Dalrino, Dalrino; Sari, Desnila; Mafriyal, Mafriyal; Hanwar, Suhendrik; Sadtim, Sadtim; Desvani, Maulia; Putri, Nadhia Hanifah
Jurnal Ilmiah Rekayasa Sipil Vol 21 No 2 (2024): Oktober 2024
Publisher : Pusat Penelitian dan Pengembangan Masyarakat (P3M), Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jirs.v21i2.1611

Abstract

Ladang Laweh Irrigation District Dam is located in Sicincin nagari, Padang Pariaman Regency with an irrigation service area of 1,140 Ha. The Ladang Laweh Irrigation Area weir receives flow from the Batang Mangor river which is included in the Batang Mangor watershed. On September 22, 2021 a flood occurred on September 22, 2021 resulting in an overflow with a height of 2.5 m above the lighthouse with an estimated discharge of 141.946 m3 /dt resulting in runoff flow in the area upstream of the bending. Analysis of the capacity of the existing river upstream of the weir was carried out with a 25-year plan flood discharge. Modeling is done by analyzing 15 years of rain data and catchment area starting from the location point of the weir upstream. The validation results under full bank capacity conditions obtained the closest match to the theoretical flood discharge value of the Nakayasu method. The simulation results show that the existing cross section of segments P1 to P19 at the Korong Gadang location is inundated during flood events with river capacity in several locations exceeding the maximum capacity. The results also provide recommendations for flood management by suggesting the addition of river embankments at locations that experience inundation.
Co-Authors Dalrino Dalrino Desvani, Maulia Hartati Hartati Ihsan, Afif Kumala Indra Agus Mafriyal Mafriyal Marceli, Fidela Erina Putri, Nadhia Hanifah Revalin Herdianto Sari, Desnila Suhendrik Hanwar