Abstract
In recently years, the hydraulic design with nature has become the most important factor in planning river management. Some traditional counter measures for flood have become of special interest. The traditional measures can not fully control floods, however, the nature is not fully destroyed by them. One of the traditional measures is an open dyke system. The open dyke is the discontinuous bank of which upstream end is opened and connected to the downstream bank with small angle of10 to30 degrees. The open dyke has some functions by which the river water inundated through it to the surrounding flood plains during floods. However, these hydraulic characteristics have notbeen examined yet. In thispaper, the flow around the open dyke was investigated by the experiment. The result of this experiment shows hydraulic functions of it.
