PENERAPAN METODE GEOLISTRIK KONFIGURASI WENNER – SCHLUMBERGER UNTUK ANALISIS REMBESAN PADA MAINDAM WADUK GRENENG, KABUPATEN BLORA

The nearly 100-year-old Greneng dam is indicated by seepage in the main dam visible from landslides on the downstream of the dam wall. This study aims to determine visible seepage in the main dam of Greneng Dam and to find out the position of seepage pattern on the body slope and foundation of Greneng Dam by Electrical Geology configuration of Wenner-Schlumberger. Visually there are 6 (six) spot seepage where, one spot of seepage is suspected as a result of groundwater flow. The indication of the seepage position is entirely located on the downstream of the main dam. The measurement result by Electrical Geology configuration of Wenner-Schlumberger with the processing of RES2DINV application obtained the result of seepage position which is represented by the lowest resistivity value with blue gradation. The results of the four work lines can be observed that each line shows the potential for different seepage, however, it can be seen that there is a potential flow of seepage in each area of Main Dam Greneng Dam which is characterized by low resistivity marked with blue color.