| Abstract |
| The field investigation was performed to improve the evaluation process of pipe deterioration, which can be the criteria of replacements and rehabilitations of pipelines in water distribution system. To evaluate the deterioration degree of pipelines, accompanied by the field investigation, the data of pipe-related facilities and maintenance history, pipe material, soil types for installation and water qualities etc. are surveyed and collected from six sites of waterworks under local governments. All the variables which is used by conventional models were considered and selected to find out the determination stage of influential factors on the deterioration of water pipelines. The way to find those factors can be divided into two categories as direct and indirect method. Also, the check lists are proposed for the direct and indirect evaluation method for deteriorated pipes. Direct method for the evaluation of the deterioration degree of water pipeline requires excavation at laying sites to collect pre-determined factors. While. deterioration degree can be guessed or predicted roughly by indirect method using pipe history, soil condition data, and so on. Factors can be modified and corrected by the field practitioners or inspectors by consideing a field situation. Also, experts in the area of pipeline management works can judge the deterioration degree of pipeline on their old experiences and accumulated know-how. |
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| Key Words |
| Deterioration, Water distribution system, Pipe materials, Soil types |
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