The variation of annual water demand of a city over a 30-year planning time horizon is exhibited in Table 8. 22. The current demand of this city is about 90 million cubic meters.

Three projects are studied in order to supply the demands of this city. Considering the cost of each project given in Table 8. 23 and 3% rate of return, find the optimal sequence of implementing projects using linear programming.

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TABLE 8.22 Variations of Annual Water Demand of the Considered City in Problem 5 Year Water demand (MCM) 2008 110 2016 125 2025 135 2035 2040 150 170