Dams are structures that are used especially for water storage, energy production, and irrigation. Dams are mainly divided into four parts on the basis of the type and materials of construction such as gravity dams, buttress dams, arch dams, and embankment dams. There are two types of embankment dams: earth-fill dams and rock-fill dams. In this book, seepage through an earth-fill dam's body is investigated using a software model. Seepage is investigated since seepage both in the dam's body and under the foundation adversely affects dam's stability. This book specifically investigated seepage in dam's body. The seepage in the dam's body follows a phreatic line. In order to understand the degree of seepage, it is necessary to measure the level of phreatic line. This measurement is called as piezometric measurement. Piezometric data sets were collected from a dam structure in Malaysia. Data set were used for simulating the developed seepage model.