Assessment of contamination trend of ground water using geo-statistics in Shahr-e-Babak for drinking uses

Today ground water has an important role for preparing drinking uses in most parts of the world. Increased population and thereby increased utilization of these resources has resulted to decreasing not only quantity but also quality of these resources. The main propose of this study is investigation of the trends of temporal and spatial variation in water quality in shahr-e-Babak to prevent issues and problems due to consumption of contaminated water by identifying contaminated parts of the region in this study parameters Ca, Cl, Mg, Na, So4 and pH were used and zoning of qualitative data was conducted using kringing method via Arc GIS 9.3, kriging method has the lowest error compared to IDW in the viewpoint of RMSE and ME. Then water of the region was classified for drinking uses based on shuller classification. Results obtained from this research showed that based on shuller diagram, water of the region in 2002 had the appropriate quality for all of elements except Mg, and in 2009 for all of element except C1 had the appropriate quality in the viewpoint of drinking uses, but general trend of the water quality is decreasing and north to east part of the region is the best part for providing water for drinking.