A STUDY ON WATER QUALITY EVALUATION OF THE CHAO PHRAYA RIVER

KATSUHIKO NAKAMURO, DAMRONG KISANANUWAT, MONTHIP TABUCANON and WATTANA SUKASEM

ABSTRACT: Water quality evaluation of the Chao Phraya River was studied on the survey from 1978 to 1980. From this present study the following results were obtained. Tidal effect reached up to about 60 km from the river mouth during dry season, but seldom reached up to 10 km from the river mouth during rainy season. Spatial and temporal changes of dissolved oxygen (DO) and biochemical oxygen demand (BOD) supported the assumption that water quality of the Chao Phraya River, especially in Bangkok Metropolitan Area, is influenced by three main factors, namely tidal effect, flow rate of the river, domestic and industrial wastewater. Correlations between salinity and chloride ion, between BOD and DO could be observed.

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Environmental Quality Standard Division, National Environment Board, Rama 6 Rd., Bangkok 10400, Thailand.

Received 30 September 1982