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Factor of Safety

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I am using SEEP2D and I would like to calculate the factor of safety with software values. I obtained gradient values for vertical but these values very very small. While I calculating the factor of safety, the result is not acceptable such as 600 or higher value. I checked everything like formula, model design but I don't understand what is the problem. Permeabilities for horizontal is 0.0001 and for vertical 0.00025. for reservoir area, the boundary condition is the head, and another side is exit face boundary condition. Under the dam has alluvium foundation and beneath the foundation has basalt. My values are m/s for each data. What should I do to obtain reasonable factor safety value? Because hydraulic gradient is important to calculate.

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