Chapter 3 – Vulnerability Assessment of Water Distribution Networks Under Abnormal Operating Conditions and Nonseismic Loads – The Case of Intermittent Water Supply (IWS)

The chapter presents, as a reference to the increased levels of vulnerability stemming from abnormal operating conditions, the case of intermittent water supply (IWS) and of related mathematical models. The chapter starts with a basic statistical and proceeds with a more detailed analysis, by use of the survival, proportional hazard rate, and regression tree methods. The analysis covers both normal and abnormal operating WDN conditions, varying levels of data complexity, and various WDN component classes. The goal is to demonstrate how historical records can be processed with analytical and numerical models, to identify underlying data patterns, and to eventually assess the corresponding risk of failure for each network element.