The three alternatives described in Table 8.14 are available for wastewater treatment of an urban area for the next 25 years of their life span. Using 5% discount rate, compare the three projects with the PW method.

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TABLE 8.14 Three Alternatives for Supplying a Community Water Supply Costs Timing Project A (S) Project B (S) Initial investment Year 0 2,000,000 1,000,000 Project C (S) 1,500,000 Year 10 0 1,000,000 1,200,000 Year 201 0 1,000,000 0 Operation and Years 1-10 7,000 4,000 6,000 maintenance costs Years 10-20 8,000 7,000 8,000 Years 20-25 9,000 9,000 9,000