The objective of this work was to develop a computer model to calculate the changes in factor of safety of a slope with time resulting from changes in the water saturation. A two-phase fluid flow model was incorporated to calculate the saturation and saturation changes in fractured and nonfractured soil and rock. A slope stability model was created to calculate the factor of safety. The fluid flow module executes for every time interval specified by the user. The slope stability module is executed at the end of any time interval when desired. As examples, factors of safety for the downstream slope of earthen dams were evaluated for various soil properties and various levels of water behind the dam.
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