Given the status as an element of Critical Infrastructure, the operation of a water-supply system is an issue of importance that demands detailed analysis. There are in fact a range of crisis situations that may arise (e.g. floods, droughts, earthquakes, breakdowns, technical disasters, etc.) in which a ubiquitous common problem may relate to the supply of the population in drinking water. The lack of any such supply is fully capable of ensuring that serious disease and even epidemics arise, hence the need for emergency plans to be drawn up as regards the supply of drinking water under various crisis situations. The trigger for analysis and safety assessment in regard to a water-supply system is then the introduction of procedures in regard to safety management that minimise the impacts of incidental undesirable events, as well as the health and sanitary risks posed to water consumers, while introducing procedures appropriate in the context of the supply of water under crisis conditions.
This chapter analysing the reliability, safety and operation of a water-supply system presents work whose main aim was to address strategies by which the safety of water-supply services is maintained. Water companies should prioritise this kind of analysis of the functioning of their supply systems, with a view to quality of supply remaining adequate. In this context, this paper may provide background against which management principles may be formulated. The management in question should make resources ready for situations arising in which undesirable events pose a threat to health, the environment or infrastructure. It is terms and concepts associated with the risk accompanying everyday water-supply operation that have been presented here, with procedures of the quality function deployment house of quality established and input offered in relation to the development of safety plans.
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