Study of Electrical Conductivity Variability and Providing Its Probable Reasons A Case Study: Water Wells on Western Sabzevar, Iran

Uncontrolled exploitation of groundwater, me anwhile successive years of drought especially in desert has caused quality changes in water. In the present study electrical conductivity maps were drawn, then variability of electrical conductivity data were analyzed. Then, by choosing the path (well source to the destination wells), the data were evaluated to assess the intensity of variation. Finally, according to the results, the reasons for the changes were obtained. The results show that, the highest measures of EC and its fluctuation has occurred in the direction of the center toward the South and in the East toward the South East. Paths with highest intensity of fluctuation locate in the South ¡in the center to the South and the East to the South East. 73.68% of the wells are in the process of incre asing. In case of continuation improper exploitation, the center and East area will experience circumstances like the South. The reasons for the change are as follows: Geology and the solubility in water, groundwater flow direction, and the fineness of alluvial clay, recovery, rivers and watercourse water quality and feeding in this way, evaporation, precipitation and ele vation area and etc.