Recently, a construction method by making use of both a steep channel and stilling basin has attracted a great deal of public attention. This is because fish migration is possible in this structure due to the slope is about 1/10. In contrast, the hydraulic jump may occur in the pool when the river is flooded. Unfortunately, the location of the toe of the hydraulic jump cannot be controlled. If the location of toe and length of the hydraulic jump can be controlled, the cost of construction decreases. Onitsuka
et al. suggested an improved USBR-type ICI for the river, i.e., the slope of chute block is changed. However, the performance of this stilling basin was not investigated. In this study, the performance of this stilling basin was investigated with changing with changing the inlet Froude number and inlet flow depth.
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