Tipologi Sistem Akuifer Endapan Gunungapi

Abstract

Groundwater takes an important role as the main water source to fulfill the basic needs of many people, such as drinking water and irrigation. High requirement of water have occurred in Bissoloro Village, Gowa Regency, which is one of the mainstay districts in agriculture. Geologically, this area is dominated by volcanic sediments. Aquifer is the subsurface layer as a place to store ground water. The presence of groundwater in volcanic sediment areas is generally in very porous and not compact rocks, alternating with layers of lava flows which are generally waterproof. Many methods can be used to identify that, one of which is the resisitivity geoelectric method. The principle of this method is to study the flow of electric current on the subsurface that flows between rock layer. This research was conducted in Bissoloro Village, Bungaya Subdistrict, Gowa Regency using a type of resistivity geoelectric method with Wenner configuration. The aim of this study was to identify the position of aquifer distribution, also to determine the type of aquifer. This study uses three lines with a length of 470 m with 48 electrodes and the spacing between electrodes is 10 m . The results of the study found two types of layers namely tuff and breccia which intersect with lava. Tufa with resistivity 12.47 - 75 Ωm is interpreted as a layer of aquifer. Distribute aquifers on each track and the type of aquifers are free aquifers and hanging aquifer.