Flood creates the most complex problems of engineering hydrology and extreme flood contains the crucial risk for urban areas, infrastructure, industry and agriculture. The aim of this paper is to study the transient flow caused by flood for levee of Filyos River. Numerical modeling based on finite element method was performed in the analyses. Plaxflow is an add-on module to Plaxis 2-D, is used for the time variation of seepage in several points of interest within the levee. Transient exit velocity at several points of interest within the levee and degree of saturation of levee and hydraulic gradient were investigated based on whether the levee contained covered materials (riprap, filter and geocomposite materials) along upstream face of levee or not. In addition, under seepage of water through different soil types underneath Filyos levee was examined. Moreover, the results of transient flow analyses when piping occurred and sand boil formed were presented for different soil types. Key Words: Seepage, Transient flow, Levee, Flood, Finite Element Method