In geotechnical engineering, considered the seepage of water that occur through the soil medium is one of the important problems that must be accurately studied; therefor, knowledge of influencing factors on the value of seepage for the soil is a necessary when designing an earth dam. In this study seepage through Al-Wand dam was analyze by using SEEP/W model. It is a sub- program of Geo- Studio where it used to determine amount of seepage through the body of the dam and study the effect of the change of thickness of core and effect of construction without filter in amount of leakage. The results were that the quantity of leakage was small effected when reducing the thickness of core and when construct the Al-Wand dam without filter at different level of water in upstream.
Hydraulic structures are structures submerged or partially submerged in water, they’re used to retain or divert natural water flow. Any hydraulic structure that retains water is faced with seep-age problems as the water seeks the path with the least resistance through or under the hydraulic structure. If the water carries materials as it flows or exerts high pressure on the floor of the structure, it will cause failures such as piping and cracks and there are many ways to prevent that, including cutoffs. In this paper, seepage is analyzed for different cases by using the empirical method (Khosla’s theory) and the numerical method by using computer software (SEEP/W). The results had some slight differences between the two methods as a result of not taking into ac-count the effect of soil characteristics of the empirical method. However, the water pressure heads underneath the impervious floor that calculated by the numerical method were greater