A planning model is developed for the determination of optimal water reuse allocation and wastewater treatment alternatives that minimizes the overall cost of water supply and wastewater treatment over a planning period. The planning model consists of two models, each based upon dynamic programming (DP). The models are: (1) An allocation DP model, which is used for the optimal allocation of water to users for each treatment alternative considered; and (2) a treatment DP model, which performs the optimal selection of treatment alternatives over time. The allocation DP model is used to define the state space for the treatment DP model. Application of the planning model is made to San Antonio, Texas.
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