Identification of the Groundwater Layer using the Resistivity Method of the Schlumberger Configuration in the Bumi Harapan Village Area

Abstract

This research applied the geoelectric method to determine the presence of aquifer layers in Bumi Harapan village. This method can determine the value of subsurface resistivity, and from this value, will know the lithology based on the distribution of subsurface resistivity. The lithology results will be described in the form of resistivity logs to make it easier to find the groundwater layer and its depth. Subsurface lithology obtained structures in the form of topsoil, clayey sand, sandy clay and clay. The layers suspected as groundwater layers are sandy clay and clayey sand. The results of the presence of average groundwater at a depth of 4 - 9 meters with sandy clay and clayey sand in the fourth and fifth layers were also found at a depth of 90 - 100 meters below the ground surface. The results of the resistivity values that are thought to be the groundwater layer are found to be 125 – 317 Ωm. Formation factor in determining the type of soil layer as an estimate of groundwater potential Below the surface. The formation factor in this study was found to be in the range of 1.7-8 with a type of aquifer layer to a medium aquifer.