This paper describes the local hydraulic characteristics of flows around the vegetative groins, which is made use of vegetations as a part of river training works. The hydraulic experiment on the basis of the flow visualization and the turbulence measurement was conducted by changing the groin span, the groin angle and the vegetative compactness, and the numerical analysis as well. The experimental results say that the present vegetative groins have the basic function as the groin work on reducing the velocity inside the groin region and on splashing water toward the main flow region. The numerical results show that we can control the flow velocity inside the vegetative groin region by changing the compactness of vegetation.
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