Hydro-Geochemistry and Groundwater Quality Assessment of Ouargla Basin, South of Algeria

This study aims to evaluate the hydro-chemical characteristics of Ouargla, Algeria basin groundwaters harvested from Mio Pliocene aquifer. The covered 70 samples; physical parameters, potential hydrogen (pH), and electrical conductivity EC ?S.cm?1 were determined in situ, using a multiparameter; laboratory analysis included dry residuals DR (mg/L), calcium Ca2+ magnesium Mg2+ sodium Na+ potassium K+ bicarbonates HCO3? sulfates SO42? chloride Cl? (mg/L). piper diagram shows that Ouargla ground waters divided into two facies, sodic chlorinated 93% sulphated 7% samples. United States Salinity Laboratory Staff (USSL) was used detect suitability groundwater irrigation where results show classed classes, poor water (C4 S4) bad S4). Furthermore, indices such as Kelly index (KI), adsorption ratio (SAR), solubility percentage (Na%), hazards (MH) confirm negative effect on soil permeability 96%, 80%, 89%, 53% (PI) analyzed samples considered doubtful (71%) safe (29%), otherwise there is no risk related residual carbonate (RSC). geo-spatial distribution deferent all area has for irrigation, except south-west part, this sub-area do not form problem RSC.