UGM Researcher: Kadar Air Tanah Tinggi Due To Longsor Jalan Sriharjo Bantul

Bantul Regent Abdul Halim Muslih together with researchers from the UGM Faculty of Engineering Study Team at a press conference/ANTARA

The Study Team from the Faculty of Engineering, Universitas Gadjah Mada (UGM) said that high groundwater levels caused loss on road sections in the Puduhan Wunut area, Sriharjo Village, Imogiri District, Bantul Regency, Yogyakarta Special Region, at the end of December 2022. A researcher from the UGM Faculty of Engineering Study Team, Fikri Faris, said that high-plastic clay in the segment of the landslide road segment has a full level of saturation in the sense that all soil pores are filled with water. "The high level of water is caused by saturation by rain which had been going on long before the incident," he said at a press conference with the Regent of Bantul, Antara, Thursday, February 16. According to him, high water levels cause the soil to be very soft, have low carrying capacity, and very easy to move. "So that the concrete pre-print sheet construction could not withstand the ground movement that occurred," he said. Researcher from the other UGM Study Team, I Gde Budi Indrawan, said the segment of the landslide road in Sriharjo Village was in the morphology of the hilly valley above the slopes of the Oyo River. south of the landslide segment, the Oyo River water flow turns north, so it tends to erode the river slope in the segment of the landslide road. "The construction of this village road is above alluvial deposits that are destroyed by the Nglanggran Brek andest rock formation. The lanau clay in the landslide segment has a thickness of up to 12 meters and high plasticity properties," he said. Ali Awaludin from another UGM Study Team said to ensure that stable and reliable road construction requires comprehensive planning considering various aspects, including river geomorphology, geological, groundwater, rainfall, seismicity, geotechnic, and land use. "As a first step, it is recommended to carry out river cliff stabilization work that can be achieved by building a deep foundation retaining wall," he said. He further said he could also add gabions construction to protect cliffs from river flow culling and land replacement (soll replacement) to minimize road body deformation.