Qualitative Assessment of Ardabil Plain Groundwater Wells

Underground water resources of Ardabil plain is used for drinking, industry and agriculture activities in the study area. In order to water quality assessment of Ardabil plain wells to use in agricultural purposes water quality of 81 deep wells that are utilized for agricultural irrigation was evaluated. In this study electrical conductivity, sodium, calcium, magnesium, potassium, sulfate, chloride, bicarbonate and total hardness were measured. Studied wells were classified based on the percentage of sodium, EC and sodium adsorption ratio. By means of Piper Diagram most of Ardabil Plain water is as carbonate type; in these wells are predominant sodium and potassium. Wilcox diagram showed that 45 % of samples(35 sample) are in middle-saline class, 43.5 % of samples(34 sample) in saline class, 11.5 % of samples(9 sample) in very saline class Overall, the risk of salinity is moderate to high and alkalinity risk is lower. These waters are relatively suitable for agricultural uses.