Investigation of Water Quality Using Fuzzy and Analytic Network Process (ANP) Methods in GIS

Fars province has a shortage of surface water resources due to its location in arid and semi-arid regions in Iran. Therefore, in order to exploit groundwater resources, determining water quality is very important. Due to the importance of the subject in this study, the aim is to determine the quality of the southern regions of Shiraz in Fars province. To prepare zoning maps of the sampled points, the Inverse distance weighting (IDW) method was used. Then, to homogenize each of the prepared layers, the fuzzy method was used. In this method, by defining the membership function for each of the zoning maps, the data were placed between zero and one based on the degree of importance they have for water quality. Finally, the analytic network process (ANP) method was used to weigh the layers and prepare the final water quality map. The results showed that about 80% of the study area has good water quality. While about 4% of the region (parts of the north and east) has poor quality in terms of drinking.