Rehabilitation Planning of Water Distribution Network through a Reliability—Based Risk Assessment

Abstract

Abstract:The efficient and effective management of existing water distribution systems (WDSs) faces challenges related to aging of infrastructure, population growth, extended urbanization, climate change impacts and environmental pollution. Therefore, there is a need for integrated solutions that support decision makers to plan today potential interventions, considering the possible consequences and variations in mid-and long-term perspectives. This study is a part of a more comprehensive project, where advanced hydraulic analysis of WDS is coupled with a dynamic resources input-output analysis model. The proposed modeling solution provides a robust tool to support planning of intervention actions and can be applied to optimize the performance of a water supply system considering energy consumption and environmental impacts. This paper presents an application of the proposed method in pipe rehabilitation/replacement planning, maximizing the network mechanical reliability and minimizing the risk of unsupplied water demand and pressure deficit evaluated at nodal level, under given economic constraints.

A risk component-based model to determine pipes renewal strategies in water distribution networks

“…Table 1 shows some of these studies between 2009-2020. From 2009 until 2020, some of the studies carried out in the WDN renewal field focused on ranking rehabilitation activities by using risk-based methods (Christodoulou et al 2009, Bicik 2010, Devera 2013, Sargaonkar et al 2013, Choi and Koo 2015, D'Ercole et al 2018, Salehi et al 2018b, Salehi et al 2019. In particular, Pipe Failure Risk (PFR) was considered in some of these studies (Rogers and Grigg 2009, Bicik 2010, Harvey et al 2013, Arsénio et al 2015, Kakoudakis et al 2017, Wilson et al 2017, Mazumder et al 2018, Winkler et al 2018, Tang et al 2019.…”

“…From another viewpoint, the majority of studies conducted in the field of Water Distribution Networks consider the concept of pipe risk on its mathematical definition (Christodoulou et al 2009, Bicik 2010, Devera 2013, Choi and Koo 2015, D'Ercole et al 2018, Salehi et al 2018b, Phan et al 2019. Accordingly, the risk value is determined by multiplying the probability and consequence of pipe failure.…”

Quantitative Measure of Sustainability for Water Distribution Systems: A Comprehensive Review

“…In fact, Walski [8] emphasized that it is difficult to identify either true or net benefit (benefits minus costs) when cost minimization is used, especially in water distribution system (WDS) design, and it often results in such designs become self-fulfilling prophecies. Additionally, several reports have emphasized that cost minimization may result in long-term and broader impacts being overlooked [5,[9][10][11][12]. Therefore, cost minimization cannot guarantee the sustainability of a system.…”

A Hazard Assessment Method for Waterworks Systems Operating in Self-Government Units

“…The sooner the system operator receives information about a threat, the greater the possibility to make the right decisions, as to restore the reliable water supply to recipients [8,9]. It should be noted that proper operation of a water network should include the following steps: conducting inspections of fittings of the water supply network through the maintenance or replacement, as well as current repairs of the water supply network and its renovation, reconstruction and replacement [10,11,12,13,14,15].…”