Aquifer connectivity assessment using stable isotope and hydrochemical analysis in the Raimanuk and its surrounding area on the Timor island

Abstract Raimanuk and its surroundings are a potential agricultural area in Indonesia. Sufficient groundwater this was significant factor for supporting activities household needs. Therefore, identifying the aquifer connectivity is essential to determine utilization pattern area. This research aims based on stable isotopes hydrochemical from meteoric water (rainwater). The samples were taken ten deep wells, six dug four springs. While rainfed locations, analyzed using Los Gatos Research DLT-100, Ion Chromatography Metrohm 830IC, acid-base titration. result shows there groups of groundwater. Group I springs that come local water. II consists wells evaporated showed relationship falls higher elevations. III drilled well flow system. Furthermore, IV with more enriched δ 18 O isotope ratio due water-rock interaction. Even though they different group, hydraulic connection between IV.