การศึกษาการใช้น้ำของผู้ใช้น้ำรายใหญ่ของการประปานครหลวง สำหรับเขตสำนักงานประปาสาขาทุ่งมหาเมฆ / ทนงศักดิ์ วงศ์อุทัย = A study of water uses by large water consumers, Toong Mahamek Branch, Metropolitan Water Works Authority / Thanongsak Wong-u-Thai
The study concerned with the water uses by the large water subscribers, who install water meter 1 ½ ” and larger, in the service area of Toong Mahamek Branch of Metropolitan Water Works Authority (MWWA). The study objectives aimed at seeking some means to be used for checking the amount of water used by the subscribers, water consumption and rates of water consumption of those subscribers who engage in different business activities. The conducts of this study began with field survey to collect some data on types of water uses, water uses behavior, and the amount of water uses. The survey procedures consist of observation of the subscriber's places, locations and conditions of water meters, and piping system in the area; interview with subscribers; and finally, reading water meter 2 times for each subscriber at 15 day duration. The analyses and studies on these field data were then made to delineate the types of water uses, amount of water uses and other water uses behavior leading to the determination of water consumption rates of various subscriber’s groups and the relationship among water uses behaviour and amount of water uses. According to the field survey of 626 subscribers with 664 water meters installed, it was found that a sizable number of meters were in improper conditions. Such improper conditions were broken MWWA registration tags (10.8%), leakage of water at valves and fittings (8.1%), improper place of meter installation (3.8 %) and dull dial which is difficult to read ( 3. 5% ). In addition, it was found that about 117 subscribers(17.8 %) pumped water directly from the main and about 110 subscribers (16.5 %) used water from deep wells as well as piped •water. The analyses revealed a high variation of the relationship of the meter size and the amount of water uses. This led to a conclusion that meter of proper size was not installed according to the amount of water uses. The rates of water consumption, obtained under this study, were mostly similar to those resulting from the previous MWWA study and the surveys made in USA. However, some differences exist due to the details of classifying subscribers, differences in water uses activities and criteria in determining the rate of water uses per unit. Some recommendations were made to enable the control fop more efficient water uses. A central inspection section should be established to periodically inspect the reading of water meter by all branches of MWWA. Additional water meter should be installed at deep wells in order to check the pumpage amount.
