Abstract
This paper presents the development of a distributed rainfall-runoff prediction system considering flood control by dam reservoirs in the Yodo River basin. The simulation results show that the system can reproduce quantitatively flood control processes such as pre-release, peak discharge attenuation, and co-operative dam operations. According to multiple simulations with different magnitudes of rainfall, we found that one in 30 year event had exceeded the design high water discharge at Hirakata in 1960, while in 2000 one in 100 year event exceeded it because of the effect of flood control by dam reservoirs. The comparison of dam flood control effects under single dam operation and multiple dam operations indicated that a dam can attenuate peak discharge effectively for larger floods when other dams work together.
