This paper presents an investigation on the design procedure of steel check dam in the gorge point using the interactive optimal design method. The design of check dam at the gorge point is a new design situation for Sabo engineers, so the optimal shape structure has to be found without so much detail constraints or conventional knowledge. In order to discover an optimal shape of steel frame structure under new design back ground, the interactive optimal design can be utilized as a supporting device for giving a human designer a hint of design direction. The design example treated in this study shows very clearly that the supporting potential of proposed interactive optimal design method is high and useful.
