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WQI is a mathematical method used to convert the bulk of the information into a single number to express the data in a simplified and explicable form. This study is concerned with evaluating an applicable WQI for irrigation use at several locations on Shatt Al-Kufa. The ten water quality parameters of pH, Electrical Conductivity (EC), Total Dissolved Solid (TDS), Total Hardness (T.H), Calcium (Ca+2), Magnesium (Mg+2), Sodium (Na+), Potassium (K+), Chlorides (Cl-1) and Sulphate (SO4)-2 were studied over a period of twelve months (January to December 2017) for six selected locations, including Zerkh, Kufa, Manathira, Hira, Mashkhaband Qadisiya on Shatt Al-Kufa, Sodium Adsorption Ratio (SAR) was also calculated. Two methods (Weighted Arithmetic and Bhargava) were applied to categorize the WQI of the raw river water for irrigation use, and then a comparison of the two methods was made to determine the difference between them. The Results of the overall, annual and seasonal WQI values according to both Weighted Arithmetic and Bhargava methods were classified as good in all selected locations with the except of some cases in summer, spring and autumn seasons for Weighted Arithmetic which were classified as excellent (0-25). The difference between the two methods is also presented.

Drinking water chlorination is one of the most significant advance in public health protection. Besides, chlorine-based disinfectants are the only major disinfectants with the lasting residual properties that prevent microbial regrowth and Provide continual protection throughout distribution system from the treatment plant to the final consumer.In this study it was evaluated the efficiency of the sterilization of drinking water in the water supply network of Kufa city, water samples were taken from seven locations distributed over the city and these samples checked in the morning and evening to identify the concentration of chlorine in all its forms (total residual, free residual and combined) , in addition to the follow up to the concentration of chlorine in the same projects processed water for the city as well as to identify the quantities of doses of chlorine added in these projects. Then the results obtained from the concentration of chlorine were compared with the specifications in order to identify the process of sterilization of water in water projects in the city.

This study aims to evaluate the management of medical solidwaste in some hospitals in Najaf city as a case study. For this study, three big local hospitals were selected that are different in specialties. The generation quantities of medical solidwaste were collected for one time in a week over four months (August - November 2010). The most important factors affecting the rate of generation of these wastes in selected hospitals were analyzed statistically to get a mathematical formula to calculate the amount of waste generated per day for each hospital. It is found that the generation rates were ranged from (1.074 - 3.844) Kg/capita/day through the study period. Due to the absence of regular application and workers conscious in management of medical solidwaste, the system management requires a safety environmental program to manage this waste, which minimizes the risks of public health and the environment.