author={Driss Halhal and Godfrey A. Walters and Driss Ouazar and Dragan A. Savi{\'c}},
  journal={Journal of Water Resources Planning and Management},
The importance of water distribution network rehabilitation, replacement, and expansion is discussed. The problem of choosing the best possible set of network improvements to make with a limited budget is presented as a large optimization problem to which conventional optimization techniques are poorly suited. A multiobjective approach is described, using capital cost and benefit as dual objectives, enabling a range of noninferior solutions of varying cost to be derived. A structured messy… 

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