The Water Quality Assessment of the Tong Waet Creek, Non Dang Village Pho Yai Sub-district, Warin Chamrap District, Ubon Ratchathani Province

Abstract

The objective of this study was to investigate the water quality in Tong Weat Creek where water flows through Non Dang Village, Pho Yai Sub-district, Warin Chamrab district, Ubon Ratchathani province. The information from the study was used by the Pho Yai Sub-district Administration Organization during their decision making process to construct a water supply system in the Non Dang Village. Water samples were collected from 3 points. In the dry season, data were collected once a month from March to April 2019 as a sampling period. In the rainy season, data were collected twice a month during July to August 2019 as a sampling period. The water quality was measured using 14 parameters including temperature, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), total coliform bacteria (TCB), fecal coliform bacteria (FCB), nitrate in the nitrogen unit (NO₃^- - N) ammonia in the nitrogen unit (NH₃ - N), copper (Cu), manganese (Mn), zinc (Zn), cadmium (Cd) lead (Pb), and chromium (Cr). The study indicated that only the total coliform bacteria and cadmium value did not meet the Water Quality Standards of Surface Water Source Type 3. For the assessment of water quality using the Surface Water Quality Index (WQI), it was found that the overall water quality was in the moderate criteria. However, due to waste contamination caused by human activities such as farming and household waste, biochemical oxygen demand, total coliform bacteria and fecal coliform bacteria ultimately did not meet the Water Quality Standards of Surface Water Source Type 3.