ANALYSIS OF SROI FOR ENVIRONMENTAL IMPROVEMENT ACTIVITIES IN AMAGASAKI CANAL AND EXAMINATION OF ITS FLUCTUATION RANGE

In this study, we calculated the SROI of the social impact of the environmental improvement activities performed at the Amagasaki Canal. In recent years, the necessity of reliability evaluation of SROI by sensitivity analysis has been discussed. Therefore, in this study, we focused on the range of values that can be taken as the SROI by setting the monetary surrogate index, outcome index (time, number of people, etc.) and contribution rate required for SROI calculation as parameters, and setting multiple can-didates of the parameters from literature value and hearing surveys. As a result, it was calculated that the SROI of the environ-mental improvement efforts of the Amagasaki Canal in FY2017 could range from 0.85 to 3.49. Moreover, as a result of sensitivity analysis, the change in the range of variation of SROI by monetary surrogate index is the most significant for this case.