WLS METHOD FOR PARAMETER-ESTIMATION IN WATER DISTRIBUTION NETWORKS

The weighted-least-squares method based on the Gauss-Newton minimizati on technique is used for parameter estimation in water distribution ne tworks. The parameters considered are: element resistances (single and /or group resistances, Hazen-Williams coefficients, pump specification s) and consumptions (for single or multiple loading conditions). The m easurements considered are: nodal pressure heads, pipe flows, head los s in pipes, and consumptions/inflows. An important feature of the stud y is a detailed consideration of the influence of different choice of weights on parameter estimation, for error-free data, noisy data, and noisy data which include bad data. The method is applied to three diff erent networks including a real-life problem.