Graduate School Chulalongkorn University Bangkok 10330 Thailand;
Department of Earth Sciences Eritrea Institute of Technology Asmara 12676 Eritrea;
Interdisciplinary Graduate School of Earth System Science and Andaman Natural Disaster Management Prince of Songkla University Phuket 83120 Thailand;
Andaman Environment and Natural Disaster Research Center Prince of Songkla University Phuket 83120 Thailand.;
Groundwater recharge; Chloride mass balance; Evapotranspiration; Water table fluctuation; Rainfall; Kriging; Thepkasattri;