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This study examined the key factors for improving the quality of environmental impact assessment reports through statistical tests and path analysis. The Lee-Colley review package was used to review the quality of the samples of 120 reports prepared by the Japan International Cooperation Agency dating from 2001 to 2012. The result of the study showed that alternatives analysis and public involvement could be key factors for improving the quality of reports. When the number of public involvement stages went up, the number of evaluation criteria for alternatives analysis showed an increasing trend and the quality of the reports improved. Finally, the study pointed out the effectiveness of alternatives analysis with a wide range of evaluation criteria and public involvement for improving the quality of reports. Further research is needed to explore alternatives analysis and public involvement in more depth as well as to improve the effectiveness of their linkage via more case studies.

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Attempts at flood management during the 20th century resulted in more flood disasters. To gain a better understanding of what went wrong, it is necessary to examine historical evidence, seek ancient wisdom and compare practices of flood management in different countries. This study examines flood management concepts and practices in China and Japan during different periods of time in history and the differences in the two countries' current management of flood retarding basins. It reveals that during the Western Han Dynasty (206 BC-24 AD), China proposed to redirect a river course to gain sufficient flood retarding capacity, and this same concept was realized, either coincidentally or intentionally, during the Edo period of Japan (1603-1868). In modern times, however, the management of flood retarding basins differs fundamentally between China and Japan. In addition, this study investigates the differences in emergency evacuation practices between China and Japan. This is the first study to highlight the link between a Chinese concept and a Japanese practice that are separated by more than 1000 years.

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