Developing a scoring system for sanitary conditions-evaluation of water roof tanks

ABSTRACT

This study was carried out to determine the role played by the roof tanks as regards the stored water quality, to develop a suitable scoring system for these tanks, to recommend the optimum tank type, and to suggest a tank maintenance schedule. The structural condition of a tank sample [concrete, steel, and barrel] was examined together with the surrounding pollution sources. In addition, water samples were analyzed for bacteriological, biological, and chemical characteristics. It was found that the barrel tanks were the worst type. To name just a few examples, the clear space was absent underneath all barrel tanks which were provided with neither surplus pipe nor drain. The bacteriological, biological, and chemical analysis of outlet water were unsatisfactory for barrels. The most vital structural factors having direct percussion on the outlet water quality were the cover, inside condition, and the adjacent pollution sources. The defective innate and design characteristics of barrels were attributed to their faulty cover, organic paints/coatings, and small size. These factors enhanced the reduction of RC and thriving of bacterial and biological parameters. A scoring system was developed to detect the sanitary condition of these tanks, and hence their grading. It was found that intrinsic scoring system was far more appropriate than the total crude scoring system. Lastly, a schedule for selecting and maintaining roof tanks was introduced