Effect of Emergency Drainage from Phetchaburi Dam on Phetchaburi River Water Quality

Abstract

The study focuses on the effects of the emergency drainage water from Phetchaburi diversion dam has on the water quality of the Phetchaburi River. The objective of this study to see the changes in the water quality including the physical, chemical and biological factors, especially through the contamination of pathogenic bacteria cause by flooding as a guideline for preventing and planning future water quality mitigation and land use areas such as water storage areas, agricultural areas, municipalities. From collection water samples throughout the river, the analysis of water quality found that the water quality in the Phetchaburi river, physical and chemical, including DO EC and TDS, tended to decrease when flowing through various land use areas but not exceeding the surface water quality standard type 3. The biological water quality showed that TCB, FCB and E. coli were found in large areas in the municipality area and the Phetchaburi river mouth area where there were fishing communities, however it is still in regards to a normal range. The results can be concluded that the emergency drainage of Phetchaburi diversion cause by flooding in the headwaters does not affect the water quality in the Phetchaburi River in all the physical, chemical and biological factors.