Up to this time, public works was enforced regarding social foundation preparation as the last goal. A main purpose of public works was showing of those functions. In case of Sabo works, it was the most important task, to defend human life and properties from sediment-related disaster. Recently, a citizen life got rich and social requests was diversified. Therefore, it is the present state that interests of citizen starts being assembled into various effects brought about by Sabo works, for example natural environment conservation effects. As natural environment is conserved by Sabo works, our citizen can enjoy an opportunity of recreation. However, because judgments of these effects depend on mentality and sensibility of a human being, evaluation method against these effects isn't established. On the other hand, recently, studies that do to evaluate environment goods by means of sociological knowledge are put into practice. Then, many examples are accumulated. In this study, evaluation of environment conservation effects brought about by Sabo works in Rokko mountain region was carried out, by means of Travel cost method and Contingent valuation method. For the results of this investigation, though a big disparity was confirmed in appraised value depending on both method, an appraised value for natural environment in Rokko mountain region understood to be a range of 30-1, 200 hundred million-yen.
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