Optimization Models for Wastewater Reuse in Irrigation

Mathematical models are formulated to develop management guidelines for an integrated wastewater reuse plan involving the use of reclaimed wastewater to irrigate summer crops. A linear-programming allocation model is used to allocate the available land area and wastewater to different crops. Information provided by the allocation model is used in a pipeline model to determine the optimal diameter of the distribution system. Statistical properties of natural runoff in conjunction with the generated wastewater are used to determine the optimal design and operation parameters of the storage facility (reservoir). The latter is determined by a change-constrained linear-programming (CCLP) model that minimizes the required capacity and provides information on the reliability of the system or its failure. Reliability of the CCLP model is examined by means of a simulation model. The models are applied to three cities in California, and the results are discussed.

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