123 Prosiding Seminar Nasional Hari Air Dunia 2019 Palembang 21 Maret 2019 e-ISSN : 2621-7469 Identifikasi Arah Aliran Bawah Permukaan Dengan Metode GPR (Ground Penetrating Radar) Identification Of Down Surface Flow Direction With GPR Method (Ground Penetrating Radar) Eddy Ibrahim 1*) , Syaiful Imam 2 , Bhinneka 3 1,2,3 Jurusan Teknik Pertambangan, Fakultas Teknik Universitas Sriwijaya *) Eddy Ibrahim: Tel./Faks. +62 818 633959 email: eddyibrahim@ft.unsri.ac.id ABSTRACT Estimates of shallow groundwater use GPR (Ground Penetrating Radar) in the Perum Kenten region with lowland morphology with rock lithology included in the formation of swamp deposits consisting of mud, mud and sand, the Palembang city government. The purpose of this GPR measurement is to find out the subsurface layer and the presence and distribution of groundwater based on differences in the dielectric constant found in each layer. Dielectric contrast in rock layers will cause differences in wave velocity and difference in amplitude of reflection signals. Based on the difference in the dielectric constant which causes the difference in the amplitude of the reflected signal, the layer passed by the electromagnetic wave can be identified. Data is obtained from the use of GPR equipment with an antenna frequency of 250 MHz with depths ranging from 8 meters to 13 meters. Data retrieval is done in clear weather. Measurements with 11 line profiles and varying line lengths are interpreted by geological structures. From the measurement results there are 2 layers, namely the top layer with a thickness of 1-2 meters and sand with a thickness of 11-13 meters with a small dielectric contrast value. Geologically, the sand layer is thought to be a superficial layer of groundwater, but its potential and distribution resulting from measurements in this area is relatively low Keywords : GPR Method, Dielectric Contract, Frequency of Antennas, Soil Layer, Groundwater ABSTRAK Pada tulisan telah dilakukan sebuah pendugaan air tanah dangkal dengan menggunakan GPR (Ground Penetrating Radar) di Kawasan Perum Kenten dengan morfologi dataran rendah dengan lithologi batuan termasuk dalam formasi endapan rawa yang terdiri dari lumpur, lanau dan pasir, kotamadya Palembang. Tujuan dilaksanakannya pengukuran GPR ini adalah untuk mengetahui lapisan bawah permukaan dan keberadaan serta persebaran air tanah berdasarkan