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Figure 7. Plan view and cross section of area draining across a contour of length, b. In the cross section, the heavy line depicts the ground surface. The stippled area is the shallow subsurface flow and saturation overland flow with discharge of TMb and udb, respectively. Here q equals the precipitation, p, minus evapotranspiration, e, and deep drainage, r; a is drainage area and h and z are the thickness of the saturated subsurface flow and the thickness of the potential unstable mass, respectively (each measured vertically). In SHALSTAB, the conductivity is assumed to drop significantly below the failure plane and the saturation overland flow, consisting of the product of the mean flow velocity, u, d (measured normal to the ground surface, and b, is not calculated. T is the transmissivity and M is sin q (from Dietrich et al., 1992).
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Copyright 1998, William Dietrich and David Montgomery
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