Investigating Temporal Changes of Groundwater Quality in Semnan Plain Using Geostatistical Method

The increase in population and natural factors such as drought, have led to critical conditions of groundwater in most parts of Iran. Considering that Semnan province is in an arid region like other dry parts of the country, it is more vulnerable to a water scarcity crisis, So, Semnan plain was selected to study the quality of groundwater. In order to study water quality, 19 observation wells were investigated. After entering the data into GIS software, using point maps and Kriging method, the zonation maps of groundwater quality were prepared. The study of quality parameters maps showed that groundwater quality was declined in this area as the wells in the study area are affected by the increase of TDS, SAR, EC and also the decrease in pH.