Evaluation of the Efficiency of some Water Supply Stations in Najaf Governorate Using the Weighted Arithmetic Index Method (WQI)

The research includes evaluating the efficiency of some of the water supply stations of Najaf governorate by studying the physical and chemical properties of raw and treatment water and comparing it with the Iraqi standard. In addition to calculating the water quality index (WQI) for each station and comparing it with the classification (Bhaven, 2011). The study was conducted on ten water supply stations (Najaf, Al-Koufah, Al-Hira, Al-Manathrah, Al-Huraira, AlHaidariyah, Abbasiyah, Al-Old and new Al-Mashkhab, and Al-Qadisiyah projects). The nine variables are PH, Turbidity, Calcium, Magnesium, T.D.S, Sulphates, Total Hardness, CL and Alk, for two consecutive years from December 2015 to August 2016. The results showed that most of the physical andchemical factors that were studied were tended to decrease after the liquidation process. The raw water was its variables showing a clear increase, especially the total hardness, especially in the very hot months of July and August. In general, it can be said that most of these factors located within the limits of the standard specification of Iraqi allowed for drinking water except (turbidity and dissolved salts and total hardness) that exceed the specifications in some months.In terms of water quality index (WQI), the results showed that (Good Water) for all stations according to the classification of Bhaven except the New Mashkhab station is (Excellent Water). *Corresponding author: E-mail addresses:Eng.zahra.abd@uobabylon.edu.iq ©2018AL-MuthannaUniversity.Allrights reserved. DOI: 10.18081/mjet/2018-6/185-199