Exotic grass species that can be established in a short period of time even in cold climates have been introduced on the slopes of river embankments in Hokkaido. However, it is necessary to consider the transition to native species in order to preserve the local ecosystem. In the Civil engineering research institute for cold region, the selection and construction methods of native species applicable to greening of embankment slopes in cold regions have been clarified. On the other hand, the frequent embankment damage caused by heavy rainfall in recent years has increased the importance of qualitative strengthening of the embankment, and the vegetation on the embankment has been required to have an erosion resistance function. Therefore, prior to the introduction of native species into actual rivers, flume experiments were conducted to determine the velocity tolerance of native species compared to the conventional exotic grass species. As a result, velvet sedge showed the same root system strength and erosion characteristics as the conventional embankment vegetation, suggesting that it is a native species applicable to embankment slope revegetation．
