Geophysical applications in exploration of groundwater in the hard crystalline terrains - An example from Sri Lanka

Resistivity imaging and geomagnetic techniques were employed in combination to investigate the ground water accumulations in hard crystalline metamorphic terrains in Sri Lanka. This paper discusses the results of first such survey conducted in Sri Lanka. First, magnetic survey was conducted in selected areas to identify magnetic anomalies suspected as ground water accumulations. Resistivity imaging was carried out on the locations where magnetic anomalies were observed. Integration of different geophysical techniques complements each other and provides a better picture in groundwater investigations.