Identifikasi lapisan akuifer menggunakan metode geolistrik konfigurasi wenner di daerah kering desa Kalitengah kecamatan Panggungrejo kabupaten Blitar

Abstract

Kalitengah Village, Kecamatan Panggungrejo, Kabupaten Blitar is a lack of ground water place, most of it is karst area. In dry season, villagers had to do hard work to find clean water source. They even have to buy it from another place. it was happened because not all of their well produces adequate amount of clean water. This research purposed to get information about spread and depth of the aquifer layer in Kalitengah Village, KecamatanPanggungrejo, Kabupaten Blitar in order to make new source of clean water. By using value of rock resistivity and subsurface structure information, clean water source can be located. The method of this research is geo-electrical wenner configuration with sounding technique. One point of sounding applied at known well as reference, and 25 points of sounding with 5 m separation as guess mapping the presence of subsurface aquifer. Acquisition have done by locate the current and potential electrodes position. Then, the current was injected until value of apparent resistivity appeared. These processes repeated until the entire area has been mapped.The result showed the subsurface resistivity value of research area. The resistivity of ground water in reference sounding point is 28-32 Ohm-meters and found in 15m below the surface. in sounding point 1-20, there is no presence of ground water aquifer. Interpretation on the result of software ZondRes2D shows resistivity value less than 28-32 Ohm-meters. The resistivity of ground water in reference sounding point is 28-32 Ohm-meters and found in 15m below the surface. Aquifer layer found at point 1 - 25 with dept about 7, 25 - 18,5 m, interpretation on the result of software ZondRes2D. The aquifer became thicker from sounding point 1 to 25 and from 3D section showed the spread of aquifer is tend to south and west.