PENDUGAAN POTENSI AIR TANAH DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI PEKON PAGAR DALAM KECAMATAN LEMONG KABUPATEN PESISIR BARAT

Abstract

This study aims to analyze the distribution, depth, and thickness of groundwater aquifers in Pekon Pagar Dalam using the geophysical method of Schlumberger geoelectric resistivity configuration. This method is effective for identifying the electrical flow properties of subsurface rocks to determine the characteristics of the water-bearing layer. Field data was processed using hardware and software, namely Res2Dinv and Surfer 12. The results showed that the subsurface structure consists of the Old Quaternary Volcanic Formation with a resistivity value of 36 - 61 Ohm m at a depth of 0 - 30 m. Shallow aquifers that are the source of dug wells are found at a depth of 3–7 m, while aquifers with higher potential are located at a depth of 20–30 m, while aquifers with higher potential are at a depth of 20 - 30 m. Based on data correlation in Pekon Sukajadi, which has a sandy layer, the groundwater table is found from a depth of 35 m with a discharge of 1.5 liters/second. Analysis of the formations on the slopes of Bukit Barisan shows that the raw water in the research location is suitable for consumption. The estimated Total Dissolved Solids (TDS) value ranges from 100 - 200 mg/L, which meets the raw water quality requirements (maximum 250 mg/L).