2023 Volume 79 Issue 27 Article ID: 23-27029
The purpose of this study is to characterize the longitudinal water quality of the Chao Phraya River based on eight water quality observations: salinity, EC, TDS, DO, chlorophyll concentration, turbidity, pH, and water temperature over a seven-year period and water temperature over a seven-year period and to determine the actual condition of the water environment at the Samlae intake. The results showed that salinity, EC, TDS, temperature, and chlorophyll increased in the dry season and decreased in the rainy season. On the other hand, turbidity decreased during the dry season and increased during the rainy season. pH showed no clear seasonal variation. The water quality of the Sam Lae intake site was evaluated using salinity and DO, which are water quality standards set by the Thai government. The results showed that the salinity was strongly influenced by the accumulated precipitation and the short rainy season. The percentage of DO in class 3 (>4 mg/L) was on a decreasing trend, indicating that the water quality was deteriorating.
