Water quality assessment and zoning analysis of Dez eastern aquifer by Schuler and Wilcox diagrams and GIS

Groundwater is an important water source for drinking water and agricultural and industrial uses in the Dez area, Iran. The purpose of this study was the assessment and analysis of Dez eastern water quality for drinking and agricultural uses by Schuler and Wilcox diagrams and zoning water quality in geographic information system (GIS) environment. Data were taken through samplings from water wells in this area. Dez plain is located in the northeastern province of Khouzestan and is between the Dez river and Glala Kohnak. Twenty wells were selected for sampling according to Thiessen polygon method in a GIS environment, and the water quality of samples was analyzed, using physical and chemical parameters. To facilitate the analysis, entering data was done in environmental GIS, using Kriging interpolation method. Results showed that the quality of drinking water based on the Schuler diagram is good and acceptable. According to Wilcox diagram, water quality was a little salty but suitable for agricultural uses. information obtained using GIS maps for water quality assessment, could enhance speed and accuracy of water quality management in this area, whereas the water quality database can be updated easily.