Assume a reservoir that supplies water for an urban area. The monthly water demand of this urban area (D_t) is about 10 million cubic meters. The total capacity of the reservoir is 30 million cubic meters. Let St (reservoir storage at the beginning of month t) take the discrete values 0, 10, 20, and 30. The cost of operation (Loss) can be estimated as a function of the difference between release

(Rt) and water demand as follows:

(a) Formulate a forward-moving deterministic DP model for finding the optimal release in the next 3 months.

(b) Formulate a backward-moving deterministic DP model for finding the optimal release in the next 3 months.

(c) Solve the DP model developed in part (a), assuming that the inflows to the reservoir in the next 3 months (t = 1, 2, 3) are forecasted to be 10, 50, and 20, respectively. The reservoir storage in the current month is 20 million cubic meters.

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0. R D, Loss, (D-R), R>D.