Identification of Groundwater Using Geoelectrical Method VES (Vertical Electrical Sounding) in Karimunjawa City, Central Java

Efforts to reduce the clean water crisis do research in Karimunjawa. Research in Karimunjawa at UTM coordinates 437524.656 m Easting and 9351066.022 m Northing aim to describe the location groundwater, distribution of brackish water and freshwater conditions so that could make as a consideration in making well drill or the usual later could reduce clean water crisis. Research in Karimunjawa uses the geoelectric resistivity method of the Schlumberger configuration. Schlumberger configuration was used to get focused data by vertical to know groundwater's presence and the layer's amount. The results were obtained in this study using the Schlumberger configuration. The first track, the groundwater aquifer, was found at KJ-08 to KJ-15, with a depth from the surface of 66.7 m with a distance of less than 1050 m. The second track of the groundwater aquifer was only found at a depth not enough from 10 m with a distance of less than 903 m. The third track of the groundwater aquifer was only found at less depth than 10 m with a distance of less than 563 m. In the fourth track, the groundwater aquifer was found at KJ-09 to KJ-12 with a depth from the surface to a depth of 66.7 m with a distance of less than 494 m.