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| ECONOMIC EVALUATIONS | ||||
| OPTIONS | 25 yr. return Floor Raising | 50 yr. return Floor Raising | 25 yr. return (5 m additional) Sea-wall Raise | 50 yr. return (9 m additional) Sea-wall Raise | Combination of the two options |
| Total benefits | 20.283 | 20.579 | 19.877 | 20.057 | 35.442 |
| Total costs | 8.775 | 10.377 | 45.000 | 81.000 | 52.190 |
| Net benefits (benefits minus costs) | 11.508 | 10.202 | −25.123 | −60.943 | −16.748 |
| Benefit-cost ration (benefits/costs) | 2.311 | 1.983 | 0.442 | 0.248 | 0.679 |
| Incremental Costs (GEF Payment) | 4.745 | 4.981 | 0.000 | 0.000 | 3.521 |
| Cost less Incremental Costs (Cost after GEF Payment) | 4.030 | 5.486 | 45.000 | 81.000 | 48.669 |