Statistical and Hydrogeochemical Comparison of groundwater quality of western and eastern plains of Kurdistan Province

This study aim to the water quality comparison of Ghorveh plain (One of the main center of potato production) and Marivan plain (One of the main center of tobacco production) in the east and west of Kurdistan province respectively. Sum of the Anions, sum of Cations, Chlorine, Sulfate, Bicarbonate, Potassium, Calcium, Magnesium, Sodium ions and Sodium Absorption Ratio, Alkalinity, Total Hardness, Total Dissolved Solids and Electrical Conductivity data of groundwater in both plains between 1998 to 2016 were compared by drawing water quality diagrams, calculation of indices, determine different ionic ratios and groundwater quality mapping using GIS. To find the distribution of data, chi-square test at the 95% confidence and for comparison of variables, independent t-test at the confidence level of 99%, was used. The results showed that in both Ghorveh and Marivan plains, cations from abundant to scarce be calcium, magnesium, sodium and potassium, and anions from abundant to scarce be bicarbonate, sulfate and chlorine. Based on the results, there is not a significant difference between the mean values of bicarbonate, potassium, calcium, alkalinity, total hardness and CO2 saturation index groundwater of Marivan and Qorveh plains. The mean values of other studied variables, ions ratios and indices were significantly different at the 99% confidence level.