Aspetti economici nelle strategie di gestione delle perdite idriche

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[automatically translated] The logical goal of every efficient manager is to full-mind eliminate the losses of the distribution network, as these are associated with increases in costs for the production and the distribution of resources, in terms of over-dimensioning of the tanks, of the installations of and treatment of the main pipes. However, the complete elimination is impossible, and in reality should be identified the level of losses that can be tolerated and control. The theoretical definition of the economic levels of water losses is not new. Already in 1881 Parry discussed the costs and benefits of a strategy of waste reduction-tion with inspections, use of materials and good quality infrastructure showing the first results of the measurement of the losses made in the city of Liverpool. At that time in vast areas of London water supply it was "imperfect and intermittent" and the carrier priority was to ensure continuity of service. Years later, in 1957, Gledhill studied the economic aspects of leak detection and developed some of the theories still in use. In 1980 the Report 26 (Technical Group on Waste of Water), compared the cost / benefit ratio of the different forms of the per-say control: passive control, regular inspections, the measurement of waste. The Report 26 read: "It is clearly uneconomical to make sure that there are no leaks along the network and at the tanks. It is also clear that there is a mild-economic them of water losses that should be tolerated. " Shore in 1988 proposed a method of definition of the objectives based on the calculation of the optimal cost. In 1994, by the WSA / WCA Engineering and Operation Committee, was released on Managing Leakage - Report C which defined the economic level of leakage, as "that level of loss for which the marginal cost for the active control of losses is equal co-'m marginal water lost. " It is important to highlight that all the approaches followed are similar. In the following graph (Farley and Trow, 2003) shows the general relationship between spending on interventions aimed at the management of losses and production costs per unit of water as a function of the level of losses. In any case, the various authors share the view that an efficient strategy for water loss management should be based on the collection of a sufficient number of data to define this relationship for each supply zone or district of the distribution system. In this context handle just the problem of leaks can be traced back to the development of appropriate management strategies and practices, by defining economically viable target in terms of the level of the reference losses set by the manager in the time that needs to be monitored and maintained. The loss control interacts in a structured activity with the different operating structures of a company water: the skilled workers in the industry are interested in optimizing the methodology,
Original languageItalian
Title of host publicationRicerca e controllo delle perdite nelle reti di condotte. Manuale per una moderna gestione degli acquedotti
Number of pages40
Publication statusPublished - 2008

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