Determination of Groundwater Quality Using a GIS-AHP Based System and Compared with Wilcox Diagram (Case Study: Rafsanjan Plain)

Document Type : Research Article


1 Ph.D Student of Hydraulic Structure, Department of Civil Engineering, Shahid Bahonar University of Kerman, Iran

2 Assistant Professor, Department of Surveying Engineering, Faculty of civil and surveying Engineering, Graduate University of Advanced Technology, Kerman

3 Ph.D. Student in Remote Sensing, Faculty of Geodesy and Geomatics Engineering, K.N Toosi University of Technology, Tehran, Iran


Determining the quality of groundwater is one of the key elements of water usage in drinking, agriculture and industry sectors. Rafsanjan plain is one of the most economical plains in the country due to the existence of pistachio orchards. Therefore, proper management and careful study of groundwater in this plain is an essential need. The present study was conducted to evaluate the groundwater quality of the Rafsanjan plain with agricultural applications. In the first stage, after selecting the effective parameters for water quality assessment, weighting was performed by Analytic Hierarchy Process (AHP) method and then the groundwater quality of the study area was determined using GIS software and bases on water quality standard provided by the University of California. According to the results of the final zoning of groundwater quality, about 1.6% of the study area has very good quality, 20% has medium quality, 52.7 has poor quality and 25.7 has very poor quality.  In addition, based on the statistical analysis of the Wilcox diagram, 1.5%, 16.2%, and 60.2% of the wells in the study area had good, medium and poor quality, respectively. Moreover, 22.1% of the wells are not included in the diagram due to very poor quality. This research revealed that a GIS-AHP-based method could analyze these kinds of data spatially and consistent results could be obtained.


Main Subjects

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