Evaluation Indexes for Deterioration Condition and Maintenance Management System for Drinking Water Distribution Pipeline

We examined evaluation indexes for deterioration condition and maintenance managent system for drinking water distribution pipeline. Those indexes included resources for human, monetary, and goods and services. Relations among those indexes were investigated and following conclusions were drawn. Ratio of ineffective water was related to pipe material, human resource, monetary resource. Rate of aged pipeline was related to human and monetary resource, as well as maintenance management systems. It was also found that as the water supply population increases, the ratio of ineffective water decreases and the rate of aged pipeline increases. Ratio of pipe material, the number of staff, and the water supply revenue also changed accordingly. Furthermore, there was a tendency to secure human resources in the utilities which implemented wide-area cooperation or public-private partnership. It was also suggested that the maintenance management activity was improving in the wide-area cooperation utilities.