Leakage Management of Water Supply Networks in Taipei Water Department
Date Issued
2011
Date
2011
Author(s)
Wang, Ming-fuw
Abstract
Taiwan, surrounding by oceans, its annual precipitation 2510mm is 2.6 times of average value worldwide. However, according to the report of Population Action International (PAI), Taiwan is ranked as the 18th water shortage country. The reasons inciude 1. its steep rivers barely holding rainfall, 2. lacking of enough reservoirs for preserving water, and 3. too much water been wasted. In 2010, “Asian Green City Index” has reported that Taipei was rated as the 2nd fine city following after Singapore, but one of the indexes, “Water”, performed nothing but ordinary, only to be weighed down by leakage rate & water consumption per capita per day which were higher than any other country in Asia.According to statistical yearbook of the Taipei Water Department (TWD), the leakage rate of the Great Taipei Area was 21.6% by the end of year 2010. Under such leakage rate, the annual water leakage volume of TWD is staggering 190 million m3 which is equivalent to half capacity of Feitsui reservoir. That is why TWD is always trying to control its leakage. In order to do it effectively, TWD has adopted the suggestion of International Water Association (IWA) who recommended that annual pipeline replacement rate must reach 1.5% to prevent the leakage of pipeline networks from deterioration. Therefore, TWD has implemented a project of pipeline replacement along with management measures for leakage control. The most important measure is District Metering Area (DMA) which includes 4 main steps of Zoning, Metering, Pipeline Replacement and Long-term Management.
This research analyzed the leakage phenomenon of different kinds of pipeline in the networks from the leakage repair data of TWD during 2004 to 2010. By studying the relation of the leaking frequency, categories of pipe and lengths of pipe, we were able to find the very areas and pipes suffering from most serious leakage which are crucial for pipeline replacement project. The TWD is now adopting IWA’s multi-pronged approach named “4-major axes of leakage management” which combines pipeline replacement, active leakage inspection, quality of leakage repair and pressure management. This research suggests that using DMA for evaluating the results of pipeline replacement & leakage repair is necessary. And, the suggestions also comprise the strategies for increasing the quality of leakage repair to avoid the Leakage Recovery in the future. Furthermore, this research would be a good reference for the TWD and other utility companies who are fighting against the leakage problems.
Subjects
Pipeline Replacement
Leakage Rate
Leakage Management
District Metering Area (DMA)
Sub-DMA
Minimum Nighttime Flow (MNF)
Type
thesis
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