Spatial Distribution of Groundwater Quality with Geostatistics (Case Study: Karaj City

Contamination of ground water resources at the moment is one of the most important environment issues. this research carried out spatial distribution of some Groundwater Characteristics in Karaj city by using geostatistics. In order to information of 43 welle that by the water district of Tehran province in 2008 were harvested and qualitative analysis was done on it were used. After fitting the best variogram model to spatial structure data (SAR، EC، TDS، Cl، SO4) in software GS+ and investigation of accuracy interpolation methods, kriging, cokriging and IDW with different powers, spatial zonation maps in software ArcGIS were provided. Results showed increasing ground water contamination of the central and southern parts to northern and western half parts. the reason is that the geological structure and focus on urban areas in northern region in case study.