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Improving the River Environment Through Dam Reconstruction (Hita City, Oita Prefecture; 2000s–2020s) On the Oyama River in Hita City, Oita Prefecture, water flow plummeted and the river environment deteriorated following the diversion of dam water to a power plant in 1973. In response, a public-private partnership reconstructed the dam facilities in 2001, tripling the water flow and successfully improving the environment. In the 2010s, river cleanup and vegetation restoration projects were implemented, and new water quality measurement technologies were introduced, with local residents and businesses actively engaging in environmental conservation efforts. In the 2020s, measures utilizing scientific data have been promoted, with reports indicating that flash releases have improved the feeding environment for young ayu and reduced flood damage during heavy rains. These efforts have led to the sustainable improvement of the river environment and enhanced regional safety, maki
ng the area a nationally recognized model case.