Abstract
Sixteen water wells have been chosen in different locations within Nimrud district, to study the variation of ground water quality during the dry and the wet season. Analysis including salinity, pH, temperature, total hardness, major cations and anions were performed. Ground water salinity (EC) has significant variation and ranged from (0.81 to 5.82) and (0.88 to 5.77) ds m-1 in dry and wet seasons respectively. About 75% of water samples have a higher EC in the wet season compared with the dry season. All samples are very hard water class. Half of the wells have higher calcium and chloride concentration in the wet season than in the dry season. Two third of samples have higher Magnesium in the dry season than the wet season. Around 87% of wells have higher sodium and potassium in the wet season than dry season. About three quarters of wells have a higher sulphate in the wet season in compared with the dry season. About 80 % of samples have a higher nitrate concentration in the dry season compared to the wet season. Water quality for irrigation has been evaluated using several parameters. All samples fall into three category groups, C4S1, C4S2 and C3S1 according to the US salinity diagram.
