Numerical Model of Seepage Analysis and Slope Stability for Horan Dam H4 in Iraq

Horan Dam H4 is an earth dam located 18 km northeast Rutba town in Anbar province in Iraq. The main objective for dam construction is to save rainfall for agriculture purposes and some household uses. In this study, a mathematical model is developed to analyze water seepage through the dam under steady state. The upstream and downstream slopes stability of the dam are also evaluated by using four methods which are: Bishop, Janbu, Morgenstern-Price, and Ordinary method. In addition, a two-dimensional finite element model was developed using GeoStudio program. The results of seepage analysis clearly show that Horan Dam H4 is safe against failure. Furthermore, the obtained factor of safety of upstream and downstream slopes stability proves that the dam body is stable based on Janbu’s method of minimum value. Moreover, it was found that the soil shear strength parameters highly influence the dam stability in steady state condition.