Abstract
There are two key issues in the safety assessment of the water distribution system (WDS). One is how to evaluate the safety levels of water supply for customers, while the other is how to describe the importance of a pipe for the global or local WDS. The water demand guarantee rate (DGR) and the water demand failure rate (DFR) are proposed. The mathematical expectations of the DGR and DFR describe the average customer’s water safety levels for the first issue. Moreover, the unit influence of pipe failure (UIPF) is put forward for the second issue. It describes the importance of the pipe for the global or local system. Several cases show how to calculate the above values with the pressure-driven model. It is also shown how to find key pipelines in the WDS. The results show that the method can provide an effective reference for real-life WDS management.
Highlights
The Water Distribution System (WDS) is one of the most important urban infrastructures
Tung defined the reliability of the WDS as the probability that the water consumption of all customers in the pipe network is satisfied, assuming that the probability of the failure in the entire pipeline is independent and the same [6]
One of the most important contributions of this paper is to provide an easy method to find the key pipelines
Summary
The Water Distribution System (WDS) is one of the most important urban infrastructures. Guercio defined the node reliability as the probability that the water distribution pipeline network can provide the required water pressure to the node after some components are withdrawn from service due to failure. In this situation, the actual available water pressure of every node in the WDS is greater than the minimum allowable pressure. One of the most important contributions of this paper is to provide an easy method to find the key pipelines It is helpful for the management department to set up plans for the construction, operation, and maintenance of water distribution facilities
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