Hydrochemical properties of ground water of Rahaliya-Ekhedhur region, west Razzaza lake, iraq

Rahaliya - Ekhedur region is located to the west of Razzaza Lake (M.IRAQ). It is within the Salman - Rutba tectonic zones characterized by the existence of Abu Jir and Imam Ahmad bin Hashim Fault Systems. The major geological formations in the studied area consists of Tertiary and Quaternary deposits described from the oldest to the youngest as : Dammam, Euphrates, Nfayil and Injana, formations, and the slope of beds is less than one degree in the direction of east and northeast towards Al-Razzaza lake. To evaluate the hydrochemical properties and the quality groundwater samples were collected from 16 wells at different depths 80-120 m, during April and October 2013. These samples have been chemically analyzed and the results indicated that the ground water is of mixed origin, very hard (TH ranging from 227.5 to 1032.8 ppm), having high pH values, while the Total Dissolved Solids (TDS) ranging from 1700 to 2750 mg/l so that the water is of brackish type. On the basis of the major cation and anion concentration the groundwater during April 2013 was of mixed Mg and Na -SO4 group having two families which are Na2SO4 family with Na+>Ca2+>Mg2+-SO42- >Cl->HCO3- and MgSO4 water family with Mg2+>Ca2+>Na+-SO42- >Cl->HCO3-. While, the groundwater during October 2013 is of two groups (Na -SO4) having two families which are (Na2SO4) family with Na+>Ca2+>Mg2+-SO42- >Cl->HCO3-and (MgSO4) water family with Mg2+> Ca2+>Na+-SO42- >Cl->HCO3-. The second group was Na - Cl with Na+> Mg2+>Ca2+ - Cl->SO42- > HCO3- and Na+>Ca2+>Mg2+ - Cl->SO42- > HCO3- . Therefore, the ground water in the region is not good for drinking due to high salinity and it is of Doubtful to unsuitable-Unsuitable for irrigation but it can be used to irrigate sensitive crops in areas