| Year | Annual volume | Construction cost ($) | Discount rate 5% | Total benefits ($) | Discount rate 5% |
| 0 | | 4,325,000 | 4,325,000 | | | 1 | | 4,325,000 | 4,119,048 | | | 5 | 2,073,362 | 40,175 | 31,478 | 3,655,309 | 2,864,030 | 10 | 2,403,594 | 40,175 | 24,664 | 4,237,505 | 2,601,461 | 15 | 2,786,425 | 40,175 | 19,325 | 4,912,430 | 2,362,963 | 20 | 3,230,230 | 40,175 | 15,142 | 5,694,852 | 2,146,330 | 21 | 3,327,137 | 40,175 | 14,421 | 5,865,698 | 2,105,448 | 22 | 3,426,951 | 40,175 | 13,734 | 6,041,669 | 2,065,344 |
| | | Total discounts | 8,934,609 | | 52,926,493 |
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