WATER QUALITY INDEX OF THE RIVER SATLUJH. KAUR, J. SYAL AND S.S. DHILLONAbstract The Satluj river is life line of Punjab and is being over-exploited due to increasing industrialization and urbanization. A mathematical formula based on nine physico-chemical characteristics has been designed to assess the pollution level and quality of water of the river has been determined in term of its being unpolluted, slightly polluted, moderately polluted, excessively polluted and severely polluted, on the basis of a study conducted at ten selected sites for a period of four years. In all, three classes of water have been identified in the river. These are designated as class I (WQI between 80- 100) representing clean to slightly polluted water, class II (WQI between 60-80) representing moderately polluted water and class III (WQI between 0-60) representing excessively and severely polluted water.
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