Using BABE Modeling Concepts to Prioritize Activities

It is not recommended that component analysis is undertaken on its own to derive a volume of annual real losses because there is likely to be a significant level of uncertainty

Problem-Solving Using BABE and FAVAD Concepts

Economic frequency of leakage control ^^

Nightflow analysis

Performance indicators Î

Performance indicators Î

Nightflow analysis

Infrastructure condition assessment

Annual water balance and components of losses

Night-day factor Pressure management

Night-day factor Pressure management

Infrastructure condition assessment

Annual water balance and components of losses

Pressure/leakage relationships

Figure 10.1 Range of problems which have been successfully modelled using BABE concepts. (Source: Water Loss Control Manual, 1st ed.)

in much of the data used in the analysis. However, a component analysis or BABE model is a very useful supplement to a top-down water balance because it provides estimates of the volumes of real losses in different elements of the distribution infrastructure. This is valuable data because it is required to develop the most appropriate loss reduction strategy and it is essential for a robust determination of the economic level of leakage (ELL) as discussed in detail in Chap. 9.

There are several commercial versions of these models (and many homemade ones) available in the market today, most of them being extremely user friendly and flexible. If using a commercial model, the operator must first fully understand what it is they wish to perform and ensure that the commercial model has been suitably customized to the local situation. If constructing a model in a spreadsheet it is vitally important that the operator fully understands the concepts being used and their limitations. And users of the models must be adequately trained if reliable results are to be obtained.

In order to arrive at an estimation of the loss situation, most statistical component analysis models require

• Infrastructure and system data

• Coefficients and default values

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