Abstract
Having a lot of data for different water quality parameters in surface water without proper interpretation are not useful for water quality management. Due to the extent of water quality parameters, water quality indices (WQI) could be used as a point scale for interpretation of these parameters. WQI is the essential prerequisite of water quality management. Since 1978, much effort have been done to present techniques to summarize water quality data to a defined numeric digit which describes the degree of water quality. In this chapter, at the first step, the historical background of WQI was reviewed. Afterward, National Sanitation Foundation’s Water Quality Index (NSFWQI) method and British Colombia water quality index (BCWQI) Method that are used frequently, described in details. Finally, the application of NSFWQI in the Kārūn River and Sefīd-Rūd River, which located on the south-west and north of Iran, were described. In addition the WQI of the Sefīd-Rūd River was investigated by BCWQI.
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