New Methodology for Determining the Optimal Rehabilitation and Replacement of Water Distribution System Componentsby Yu-Chun Su, Univ of Texas at Austin, United States,
Larry W. Mays, Univ of Texas at Austin, United States,
Abstract: A methodology is presented for the determination of the optimal timing for the rehabilitation/replacement of water distribution system components in order to minimize costs. In this model the pipe roughness together with the water quantity and the pressure requirements at demand nodes are considered as random variables so that constraints on nodal demands and minimum pressure heads are expressed in probabilistic form. A chance constrained approach is used to transform the model into a deterministic equivalent model which is further decomposed into an integer programming master problem and a nonlinear programming subproblem. An enumeration method can be used to solve the integer master problem, and a generalized reduced gradient method together with a hydraulic simulation model can be used to solve the nonlinear subproblem.
Subject Headings: Water supply systems | Simulation models | Hydraulic models | Rehabilitation | Hydrologic models | Water pipelines | Pressure pipes
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