ASSEESSMENT OF INDEX FOR AQUIFER WATER QUALITY FOR IRRIGSTION AND LIVESTOCK PURPOSES OF DAMMAM AQUIFER IN NAJAF AREA OF IRAQ

Abstract

The value of Water Quality Index (WQI) is a good indicator of water quality. The objective of this study is to assessment of Index of Aquifer Water Quality (IAWQ)for irrigation and livestock purposes for the Dammam confine aquifer in the western desert.The values of (IAWQ) are shown of chemical parameters which can delineate the areas of natural pollution especially in discharge areas. In spite of presence of pollution for such contaminated parameters correlate with presence of source rocks of theses parameters, it can be noted that most of groundwater samples over study area were permissible for irrigation. As a conclusion, the Index map shows that ground water lies within permissible-polluted for agriculture purposes. As a conclusion, the Index map shows that ground water lies within good for livestock purposes. The GIS technique was used to prepare IAWQ maps of study area to show the distribution of Index values for individual locations of samples over the study area.The IAWQ index together with GIS serve or benefit the decision makers for drill the wells in the area to get ground water with a less pollution and land use planning with a less danger from pollution. The groundwater in the study area is generally alkaline in nature with pH ranging from 7.02 to 8.50 for two seasons. The TDS values range between 880 to 2000 and 1030 to 2270 mg/l for wet and dry seasons. The analyses indicate much variation between the two seasons, where major ions and heavy metals have high concentration for wet than dry seasons. The SO42 – was the most pollution parameters the effects on ground water for different uses.On the basin of the value of IAWQ was applied for agriculture purposes and for livestock purposes in study area, the ground water lie within permissible-polluted for agriculture purposes and lie within good for livestock purposes.