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The Impact of Horizontal Drainage on Persistent Leakage of Non-Homogeneous Soil Dam Body Original Article, D66 Imani O, Merufinia E, Siosemarde M. J. Civil Eng. Urban. 4(4): 435-439. 2014 ABSTRACT: The leaking water flow from the soil dam body lead to transport of its materials that this issue causes internal corrosion and create piping phenomenon in the dam body. To avoid causing this phenomenon, the drainage plan in the downstream of the dam body is necessary. In this paper, the flow leakage of Jaghnab soil dam by using the seep w software based on finite element method have been calculated and the effect of horizontal drainage dimensions on the amount of leakage flow from the dam body has been investigated and evaluated. The result shows that in the non-homogeneous dam, by increasing the length and the thickness of horizontal drainage, the amount of leakage flow increases too. But the effect of the horizontal drainage length in increasing of leakage flow compared to its thickness is significant. In addition, in the dam shell dissimilar condition when kx>ky, the effect of length and thickness parameters of horizontal drainage for the discharge of the drainage water is reduced. Keywords: Horizontal Drainage, Non-homogeneous Dam, Leakage Flow, Finite Element منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(4)%20435-439,%202014.pdf J. Civil Eng. Urban., 4 (4) 435-439, 2014.pdf