PENANGANAN AMBLESAN SUMUR DESA JUNGKARE KECAMATAN KARANGANOM, KABUPATEN KLATEN, JAWA TENGAH

Abstract

Until the initial assessment was conducted at least 12 wells of residents of Jungkare Village, Karanganom Subdistrict, Klaten Regency, Central Java experienced subsidence. Various theories and hypotheses have been put forward by observers and disaster experts to answer the phenomenon. These theories and hypotheses need certainty so that the public can prevent and mitigate the phenomenon. Geological, geophysical, and social studies are participatoryly carried out in the hamlets in Jungkare Village that experience the phenomenon of subsidence wells on the southeast side of Mount Merapi. Preliminary results of the study concluded that (1) the sinking of the well occurred due to the collapse of the well wall due to the unstableness of the well wall; (2) This instability occurs due to the saturation of the building material of the well wall by rising groundwater level, excessive water addition causes the toughness of the wall to disappear, (3) the pattern of subsidence in more detail depending on the geological order, (4) the pattern of subsidence in more detail depending on the depth of the aquifer, the structure of the well mouth, the structure of the well's sedimentation, and the magnitude of mat changes. Researchers recommend; (1) to carry out the subsidy and compaction of wells that have been flooded; (2) strengthen the stability of the well wall by installing concrete buses on the entire well wall; (3) make an alternative pump well with piping.