Gary Wolff, G. (2008). Calculating constant-reliability water supply unit costs. Water policy ; vol. 10, no. 1 ; p. 95–104. doi:10.2166/wp.2007.032
Abstract: Water planners facing a choice between water “supply” options (including conservation) customarily use the average unit cost of each option as a decision criterion. This approach is misleading and potentially costly when comparing options with very different reliability characteristics. For example, surface water, desalinated seawater or recycled wastewater and some outdoor demand management programs have very different yield patterns. This paper presents a method for calculating constant-reliability unit costs that adapts some concepts and mathematics from financial portfolio theory. Comparison on a constant-reliability basis can significantly change the relative attractiveness of options. In particular, surface water, usually a low cost option, is more expensive after its variability has been accounted for. Further, options that are uncorrelated or inversely correlated with existing supply sources—such as outdoor water conservation—will be more attractive than they initially appear. This insight, which implies options should be evaluated and chosen as packages rather than individually, opens up a new dimension of yield and financial analysis for water planners.
Contact: Gary Wolff, Pacific Institute, 654 13th Street, Oakland, CA 94612, USA Tel: +1 510 251 1600. Mobile: +1 510 823 3935, Fax: +1 251 email@example.com