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Nature-friendly river works have been intensively executed since the announcement by the River Bureau in 1990 paying much attention to riverine ecosystems. Biological diversity is also discussed in river improvement works since 1992.In this paper additional costs of nature-friendly river works, augmentation of conservation flow and selfpurification facilities by vegetation are investigated inductively. Benefit of nature conservation is estimated by a contingent value method, namely, willingness to pay. In the Tone River watershed it is concluded the benefit of nature conservation is larger than the cost of restoration works discussed in this paper.

COST AND BENEFIT IN ECONOMIC EVALUATION OF RIVER RESTORATION WORKS