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It is important to reinforce the toe of levee back slope against failure by the overtoppingflow due to a flood exceeding the designed level. Inorder to control the running water from the back slope and toremove the inflowing water without delay, we proposed the toe protection works consisting of several units of drain ditch. In this study, the flow pattern and the flow velocity have been investigated on the proposed the protection works byusing two model levees. As a result, it was considered that the behavior of flow on the toe protection works depends on the width of an unit of drain ditch. In the case of the drain ditch unit with the relative width of 2.15 and with holes, the flow velocity was markedly decreased. Such the effect was attributed to the dispersion of the flow. Furthermore, it was recognized that there was a difference in the flow pattern between two types of the drain ditches with a projection and without it.

Experimental Examinations on the Toe Protection Works of Back Slope against Overflow from Levee