Chemistry of the Groundwater in Karaj Plain, Alborz Province, Iran

An attempt has been made in this present work to determine the groundwater quality in Karaj plain. Karaj plain is situated in the northwest of Tehran, Iran. Totally, 50 groundwater samples were collected from bore well during pre-monsoon and post-monsoon seasons and analysed for physicochemical parameters to understand the hydrogeochemistry of the groundwater. The analysis results were interpreted with various geochemical diagrams such as Piper trilinear plot and USSL classification and Gibbs diagram. To understand the geochemical facies interpreted with Piper Trilinear diagram and Gibb's diagrams. The graphical interpretation of the Piper trilinear diagram shows Ca, Na facies followed by Cl, So 4 , and HCO 3 facies. Similarly, USSL and Gibb's diagrams represent C 3 S 1 field and a considerable number of samples in rock-water interaction field. In the present study to understand groundwater quality of good in Karaj plain.