Diagram of water movement in hillslopes


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Figure 3. Schematic depiction of water movement through the landscape before and after the 1980 eruption. Width of arrows depicts relative magnitude of water transfer. In the posteruption diagram, note the loss of canopy interception, the greater amount of precipitation reaching the ground surface, reduced evapotranspiration, the reduction of surface infiltration, and more prominent overland flow. Also note the hypothesized changes in subsurface water transfer (from Major and Mark, 2006).

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Jon Major
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