Speaker
Description
The upper Chao Phaya Basin is the largest Cenozoic sedimentary basin that is located in the upper central part of Thailand. The basin is a high potential area for agricultural activities, such as growing rice, sugarcane and vegetables. In each year, the groundwater level has decreased continuously about 10-30 cm/year. Groundwater levels dropped from 5-10 m. to 10-25 m below ground surface at present. The water samples from groundwater, and surface water in Bang Rakam area were collected for analysis of stable isotopes (O-18 and H-2 in water), .tritium (H-3) and Carbon-14 (C-14) as well as chemical composition such as major cat ion and anion as well. The most of groundwater samples, they have the water as of Na