The book concerns influence of unsaturated soils of earth dams. The effective stress variable has been used in the Mohr-Coulomb theory for predicting the shear strength of saturated soils. In this book is considered a clay core of earth dam that water level is supposed. Tree types of soil are chosen for calculation of unsaturated cohesion with two mentioned methods, Eq. Matsushi and Matsukura and Eq. Lee et al.This book shows the influence of the water level on the cohesion profile in the dam. Also, the book concerns the seismic induced response of earth dams. Analysis is...