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Figure 4. The one-dimensional approximation used in the slope stability model in which the failure plane, water table, and ground surface are assumed parallel. The slope is q, the height of the water table is h, and the thickness of the colluvium that slides above the failure plane is z. Typically, the failure plane is at the colluvium- weathered bedrock or saprolite boundary.
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Copyright 1998, William Dietrich and David Montgomery
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