Internal erosion under spillway rested on an embankment dam

Document Type: Research Paper


1 Assistant Prof. Soil Science, College of Agriculture, Yasouj University

2 Assistant Professor, Civil Eng Dept, Faculty of Engineering, Yasouj University, Yasouj, Iran

3 Department of Watershed Management, Faculty of Natural Resources, Yasouj University, Yasouj, Iran.

4 Research Engineer, Mexican Institute of Water Technology, Paseo Cuauhnahuac 8532, Jiutepec‎


In this paper we investigate the mechanism of internal erosion caused in the right abutment of the Shahghasem dam’s spillway. Shahghasem dam is an earthen dam located in Yasouj, in southwest of Iran. A significant hole and pipe have been observed in the corner of the right abutment from upstream view. The foundation is Marlstone, which has low cohesion and susceptible for internal erosion and piping in some conditions. Going through details of the design maps has shown that Lane’s criteria for selecting safe dimensions of the seepage control measures have not been considered properly. A series of the supportive walls are designed to attach to the right part of the spillway in order to increase the length of seepage. The pipe route of the erosion should also be grouted with high quality concrete.


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