Five years ago a dam was constructed to impound irrigation water and to provide floodprotection for the area below the dam. Last winter a 100-year flood caused extensivedamage both to the dam and to the surrounding area. This was not surprising, since the damwas designed for a 50-year flood.

The cost to repair the dam now will be $250,000. Damage in the valley below amount to $750,000. If the spillway is redesigned at a cost of $250,000, the dam may be expected towithstand a 100-year flood without sustaining damage. However, the storage capacity of the dam will not be increased and the probability of damage to the surrounding area will beunchanged. A second dam can be constructed up the river from the existing dam for $1million. The capacity of the second dam would be more than adequate to provide the desired flood protection. If the second dam is built, redesign of the existing dam spillway will not be necessary, but the $250,000 of repairs must be done.

The development in the area below the dam is expected to be complete in 10 years. A new 100-year flood in the meantime would cause a $1 million loss. After 10 years, the loss wouldbe $2 million. In addition, there would be $250,000 of spillway damage if the spillway is notredesigned. A 50-year flood is also lively to cause about $200,000 of damage, but thespillway would be adequate. Similarly, a 25-year flood would case about $50,000 of damage.

There are three alternatives: (1) repair the existing dam for $250,000 but make no otheralterations, (2) repair the existing dam ($250,000) and redesign the spillway to take a 100-yearflood ($250,000), and (3) repair the existing dam ($250,000) and build the second dam ($1million). Based on an expected annual cash flow analysis, and a 7% interest rate, whichalternative should be selected? Draw a decision tree to clearly describe the problem.