A comparative study on the performance of NSFWQIm and IRWQIsc in water quality assessment of Sefidroud River in northern Iran.

摘要: Local water quality indices (WQIs) are usually developed by modifying internationally recognized indices, which considered reference index. In previous works on WQIs, the performance of local and has not been compared with each other. Therefore, question crosses mind whether using or international indicators individually can show all qualitative aspects a resource. this study, it was aimed to make comparison between NSFWQIm (National Sanitation Foundation Water Quality Index) as index IRWQIsc (Iranian Index for Surface Resource-Conventional Parameters) one through case study (Sefidroud River in northern Iran). Based results, indices' representing seasonal spatial fluctuations river almost similar. However, scores obtained two were somewhat different. NSFWQIm, average score about 49.0, categorized "bad" class, while represented an 56.1, corresponds "fairly good" class. identified stricter criteria than IRWQIsc, regarding public health. On other hand, according relative standard deviations (0.17 0.21 IRWQIsc) qualities, better distinguished high low qualities river. Accordingly, order interpret conditions surface resources Iran, is necessary use both since (reference index) attracts attention standards requirements, (local causes more focus seasons locations worst quality.