MAPPING OF SEA WATER INTRUSION IN CANDIDASA TOURISM AREA WITH GEO-ELECTRIC METHODS

The development of hotels and villas in the Candidasa area has led to an increase in water demand. Intake of ground water is one of the efforts to meet the need for clean water. Excessive extraction of ground water for domestic, industrial and other services causes a decrease in groundwater level so that the flow of water becomes reversed from the direction of the ocean to the mainland resulting in seawater intrusion. To find out the amount of sea water intrusion that occurred in the Candidasa area, mapping needs to be done using the Geoelectric Method. Geoelectric Method is one of the Geophysical methods that works by injecting an electric current into the ground and then measuring the potential difference caused. Based on electric current data and potential differences, resistivity will be obtained in the study area. The results of sea water intrusion mapping in Candidasa Tourism area show that sea water intrusion has occurred but not yet in an alarming status. If groundwater abstraction unlimited, it is likely that the level of intrusion will continue to increase. The results of the study are expected to provide input to policy holders regarding seawater intrusion in the Candidasa Tourism area so that the right policy steps can be taken.