Assessment of Groundwater Quality Based on Entropy Weighted Water Quality Index

Authors

1 Faculty of Earth Sciences, Kharazmi University, Iran

2 PH.D Student Of Hydro Geology, Shahid Chamran University Of Ahvaz

Abstract

   In this study, the groundwater resources of Zanjan plain are assessed based on WHO standard for drinking water quality. In order to prevent the expert judgments about weight of parameters that occur in WQI method, the Entropy Weighted Water Quality Index (EWQI) was used to make higher precision of groundwater quality assessment. Results of factor analysis indicated that over 75% of changes in groundwater quality can be investigated by four factors and using 12 parameters including Ca, Na, K, Mg, NO3, Cr, Zn, EC, TDS, pH, DO and BOD. Factor 1 by controlling more than 33% of the changes has the highest impact and then the factor 2 with more than 19%, factor 3 with more than 12% and factor 4 with 10% are the most important factors affecting water quality in Zanjan plain. Based on the calculated entropy value and entropy weight of each parameter, Zn has the highest impact on water quality; Na, Ca, NO3, pH, K, Mg, DO are in the next rank. Based on EWQI, 5.08% of samples have the rank 1(excellent quality) and 72.88% (43 samples) are in rank 2 (good quality) for drinking. The 10.16% of Samples show the quality rank 3(medium quality), 6.77% of samples have the rank 4 (poor quality) and finally 5.08% of samples are in rank 5 (extremely poor).
 

Keywords

References

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