Huong, Thach Han and Kien Giang rivers are the important surface water sources in Thua ThienHue, Quang Tri and Quang Binh provinces, respectively (in Central Vietnam). The river water samples were taken monthly (from June 2001 to May 2002 for Kien Giang river and from January to December of 2004 for Thach Han and Huong rivers) at selected sites. The temperature, pH, conductivity (EC), salinity, turbidity (TUR), DO, COD, BOD5, nitrate, ammonia, phosphate, total solids (TS), hardness, total dissolved iron, total coliform (TC), fecal coliform (FC) and sodium adsorption ratio (SAR) of water samples were analyzed. Water quality index developed by Bhargava (Bhargava-WQI) was modified and applied to assess water quality of the above mentioned rivers. Based on Bhargava-WQI, the classification and zoning of the rivers for beneficial uses were carried out. The results obtained show that the water quality index can be used as an efficient tool for the water quality management and water pollution control of the rivers.
Bhargava, D.S. (1983), Use of water quality index for river classification and zoning of Ganga River, Environmental Pollution (Series B), 6, pp. 51-67.
Bhargava, D.S. (1985), Water quality variations and control technology of Yamuna river, Environmental Pollution (Series A), 37, pp. 355-376.
Canadian Council of Ministers of the Environment (2001), Canadian water quality guidelines for the protection of aquatic life, Canada.
Clesceri, L.S., Greenberg, A.E., and Eaton, A.D. (1998), Standard method for the examination of water and wastewater, 20th Ed., APHA, USA.
Hop N.V., Long H.T., Lieu, P.K., Tung, T.Q., Phong, N.H., and Binh, T.T. (1999), Present status of water environment in Thua Thien Hue province 1994 1998, Scientific Report, Thua Thien Hue Department of Science, Technology and Environment, Hue (in Vietnamese).
Ministry of Science, Technology and Environment (2002), Vietnamese standard for environmental quality Water quality, Vol. 3 and 4, Ha Noi (in Vietnamese).
Nelson, F., Alberto, R.R., and Fredy, S. (2004), Physico - chemical water quality indices – a comparative review, Revisal BISTUA, Colombia, pp. 19-30.
Nives, S.G. (1999), Water quality evaluation by index in Dalmatia, Water Research, 33, pp. 3423-3440.
Ott, W.R. (1978), Environmental indices - Theory and practice, Ann Arbor Science Publishing Inc.