Abstract
In this research, we developed an accident risk assessment model and leakage risk assessment model using quantification theory so that the diagnosis of the safety of water pipeline systems may be done with ease. The external criterion (objective variable) for the first model was taken as the number of repairs done on the water pipe while that for the later model was taken as the amount of water leakage. The descriptive variables of the models were taken as the qualityof the pipeline material, the presence or absence of outside covering, topographic features, andother factors. We then proceeded to describe how two different diagnostic results could be used insetting up plans to improve the pipeline as demonstrated by detailed practical examples. As a result, it became clear that diagnoses by the proposed models are helpful in improving the safety of pipelines by identifying which parts shall be given priority attention as determined in consideration of accident risk and which are also arrived at using leakage risk approach and the assessment models also prove effective in pipe replacement activities.
