Abstract
The uncertainty and spatiality which are characteristics of disasters, to measure the benefit of natural disaster prevention projects must be caught. This paper proposed the simple benefit measurement method that is able to use in the practical cost benefit analysis. I constructed the socioeconomic model under uncertainty, defined benefit with Non-Contingent EV, showed the incidence form, and led the form based on the characteristic which benefit was cancelled in the markets. And I proposed the short cut method to be able to measure benefit simply and approximately. It was confirmed that the value of an approximation is obtained, by measuring the benefit of the flood control works.
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