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This investigation has been conducted in the Bani walid district, Libya, that located 180 kilometers from southeast of Libyan capital Tripoli and it is located between latitudes 3122 to 31 49 and longitudes 1342 to1429 with an objective of understanding the suitability of Bani walid area groundwater quality for irrigation purposes. Ground water is the main source for water supply and irrigation purposes .Groundwater samples have been collected from different wells found in Bani Walid Valleys to evaluate some chemical parameters such as EC, pH, concentration of total dissolved solids (TDS), Ca , Mg +2 ,Na , K, CO3 ,HCO3 ,Cl ,SO4 -2 , NH4 + , Mn ,Fe , B and NO3 .The chemical analysis were carried out for fourteen samples. Coordinates of wells samples were recorded using the Global Positioning System (GPS). Physical and chemical parameters were analyzed by means of contour maps to illustrate the spatial distribution of chemical constituents of the ground water samples. The abundance of the major ions is as follows Cl ˃ SO4 ˃ HCO3 ˃ CO3 and Ca ˃ Na ˃ Mg ˃ K. Piper diagram is used to illustrate the suitability and type of ground water as well as Richard and Wilcox classifications are used to show the suitability of study ground water for irrigation. Also, other parameters such as Residual Sodium Carbonate (RSC), Sodium Absorption Ratio (SAR) and Soluble Sodium Percentage (SSP) have also been determined. The distribution pattern of EC and chlorides and SAR which are the general indicators of groundwater quality reveals that ground water samples falls in the field of doubtful to unsuitable for irrigation except samples 2,3,5,6 7 and 8 which they are fell in the field of good to permissible for irrigation. They are mostly located in Tininai Vally.

Evaluation of Ground Water for Irrigation in Bani Walid District, Libya.