Qualitative zoning river Karun, Dez and Karkheh using water quality indices

Rivers are discussed as sources of water supply for various uses including agriculture, industry anddrinking. Thus, monitoring the quality of these resources due to the recent drought and urban and ruraldevelopment is one of the important tasks in the field of environmental management. In this study,nine stations sampled seasonally the Karoon river, Dez, Karkheh in a one-year period from October2010 to September 2011 was conducted to coincide with cold and warm seasons. Parameters such astemperature, conductivity, dissolved oxygen, pH, turbidity, BOD and COD concentration of anionsand cations with original and microbial parameters were measured. The study used data from theNational Quality Indicators NSFWQI, Pollution Control Commission of India, the Ion ratios andWilcox index. Analysis of parameters on the basis NSFWQI index showed that In the second half ofthe season coincides with the period of high rainfall is high than 50, indicating that quality is bad.Classification of river water quality standards of the Central Pollution Control Commission of Indiais also roughly consistent with the results of NSFWQI. The results showed that the maximum ionconcentration of cation ions sodium –magnesium and chloride anion is the minimum concentration ofions. The classification was measured according to Wilcox index, the resulting quality of the waterwas used for irrigation and drainage for salinity control in the management of land.