Abstract:
This thesis is a study of water leakage in the pipe line of the Metropolitan Waterworks Authority, and proposes the pipe line system network model for Tung Mahamek Branch. It is concluded that 1. Water leakge of Tung Mahamek Branch during October 1993 to September 1994 was 59 cubic metres per metre of the pipe length, averaging 107,583 cubic metres per day or 3,272,583 cubic metres per month, or 38.6 percent of the amount of water through the pipe. 2. The main causes of water leakage of the pipe line system in fiscal year 1994 were aging, corrosion and damages from construction and repairing. The amount of leakage was about 25,446,000 cubic metres. The leakage index per customer was 49.96 litres / customer / hour and the leakage index per pipe length was 5.55 litres / metre / hour. 3. The network modeling of Tun Mahamek Branch uses computer to study flow rate and hydraulic grade line at any node in the network. The model assumes that the behavior of the flow rate agree with hydraulic theory. Important input data are in-flow rate of the branch and the demand from billing. A statistical test showed that the hydraulic grade line of the model and the hydraulic grade line in the field test were not different significantly at the significant level of 0.05.