AWWA JAW68590

A hydraulic network model provides an important perspective on water system performance that is simply unavailable by any other means. Through mathematical simulations, a model can provide information about pressures and flows both for locations that are not readily accessible and for scenarios that have not yet occurred or that occur with low frequency and high consequence. However, some of the input parameters required for hydraulic network modeling are not knowable with a high degree of accuracy. The temptation to adjust these parameters so that model results match commonly available field data cannot be justified mathematically and should not be considered for calibration. The reconciliation of model results and field data may include a sensitivity analysis of input parameters and the consideration of possible network anomalies, such as closed valves. The techniques recommended here can allow for more effective use of a model within the inherent limitations of input accuracy. Includes 9 references, table, figures.