In dynamic analysis of concrete gravity dams, most engineers consider the water domain as a semi-infinite fluid region. However, there are practical cases that the reservoir cannot be treated as a uniform infinite channel. This is likely to happen when the stream meanders near the dam. In such a case, the reservoir can no longer be considered of infinite length. The purpose of this study is to show that the length of the reservoir affects the response significantly and it should not be modeled as an infinite domain in general.In this study, dam-reservoir, dam-foundation and reservoir-foundation interactions are all treated rigorously based on a combined finite element-boundary element procedure. A computer program is developed on this basis and results are compared for a triangular dam.
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