Detection of groundwater sources in Lembor village using geoelectrical resistivity method schlumberger configuration

Drought is one of the problems faced by the people of Lembor Village, Lamongan Regency, this problem will be slightly resolved if the area has reserves of groundwater sources. Therefore, this study aims to determine the existence of potential groundwater sources around Lembor Village. The method used is the geoelectrical resistivity method schlumberger configuration. Data acquisition was carried out for 10 measuring points of Vertical Electrical Sounding (VES) with a track length of 310 meters, and a distance between electrodes of 10 meters. The measurement results are then correlated between VES points to produce a 2-dimensional cross-section. The results showed that the measured resistivity value was between 0.03 Ωm to 81.1 Ωm. The structure of the subsurface layer of the study area is dominated by clay and limestone. The indications for the presence of groundwater are found at a depth between 25 to 35 meters at a track distance of 35 to 45 meters, a track distance of 170 to 180 meters, and a track distance of 270 to 280 meters with resistivity values between 0.03 Ωm to 0.32 Ωm. The indications of the presence of groundwater sources need to be investigated in a wider area, to determine the distribution and direction of groundwater flow.