investigators both nationally and internationally. Material presented in this text provides the necessary foundation for students, with a background in elementary fluid mechanics and applied mathematics, interested in the analysis of such problems. The primary objective of this text is the presentation of basic principles of the mechanics of two-phase fluid systems in soils and porous rocks. Changes appearing in this third edition are made with the objective of providing a clearer presentation of basic principles. Chapters 4, 5, and 6, were revised to include new material and give a more rigorous treatment of the theory for flow of two immiscible fluids.This book has successfully been used as a reference book and as a textbook by major universities.

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