A dam is being considered on a river that periodically overflows. Each time the river overflows, it causes about $600,000 in damages. The project horizon is 40 years. A 10% interest rate is being used.

Three different designs are available, each with different costs and storage capacities (see Table 6.14).

The U.S. weather service has provided a statistical analysis of annual rainfall in the area draining into the river (see Table 6.15).

Assume that the dam requires no annual maintenance, has zero salvage value at the end of its 40-year life, and is essentially empty at the start of each annual rainfall season. Which design alternative would you choose?