Modeling of Aquifer Using Vertical Electrical Sounding Data with Kriging Interpolation in Padang City

Aquifer is an underground layer of water. Currently, many residents of Padang do not know the exact position of the aquifer. Many drilling activities have been carried out to find ground water. But the results are not in accordance with the predetermined depth targets. This situation will be affected to the costs incurred for drilling. This study aims to model aquifers in Padang and find out their depth and thickness. One way to identify aquifers is to use geoelectrical resistivity method. In this study, researchers used a one-dimensional vertical electrical sounding (VES). The collection of geoelectrical sounding data is spread in 36 points in Padang. To modeling the aquifer layer, kriging interpolation method is used. Based on the results of processing rock resistivity models, it was found that the average aquifer depth in Padang is about 6.23 meters, with the shallow depth in 1.01 meters and the deepest in 20.02 meters. While the average thickness of aquifers is about 7.47 meters, with the thinnest thickness in 1.68 meters and the thickest in 11.74 meters. The aquifer layer was identified as unconfined aquifer.