AN EXAMPLE OF IDENTIFYING KARST GROUNDWATER-FLOW

Hydrogeological investigations for the purpose of regulating the karst aquifer were carried out in the mountain massif of Kucaj in the Carpa tho-Balkan range of eastern Serbia. Different geo-physical methods wer e applied in order to identify the position of karstified zones with a ctive circulation of karst underground streams. Especially good result s were obtained by using the spontaneous potential method for the expl oration and construction of boreholes and wells. In the valleys of Crn i Timok and Radovanska reka the measurements have been carried out ups tream along the whole width of the alluvium to the limestone periphery . A number of positive and negative anomalies have been recorded. In t he centres of positive anomalies several boreholes were located: HG-19 (centre of anomaly + 30 mV, total length of the biggest cavern is 9 m ); HG-1 (+20 mV, cavern of 2m); HG-15 (max, +114 mV, effective caverno usness is 17%).