A Review of Different Approaches of Water Quality Indices

Abstract

Water is a precious gift to all human beings. Water quality of sources affects its demand, supply and management. So its rapid quality assessment becomes important in these days. A Water quality index provides a convenient means of summarizing complex water quality data and facilitating its communication to a general audience and to managers. To express water qualities in significant way different water quality indices are used depend on purpose. WQI reduce great amount of parameters into simple numeric value which indicates its quality which make easy interpretation of monitoring data. In this review paper, various WQI indices are discussed which are used for assessing surface water quality. Several national and international agencies involved in water quality assessing and pollution control defines water quality criterion for different uses of water considering different indicator parameters .There are number of WQI specific to any region or area.
Key Words: WQI, ecology, Coliforms, DO, BOD