Abstract
A structured clay soil at a sloping site in the Wytham catchment near Oxford, England, was examined with the intention of establishing the route followed by water through the soil during rainfall. The hydraulic conductivity/matric potential relationship for wet soil was measured by the instantaneous profile method in the field and by steady-state measurements on soil cores. A series of experiments were performed in which controlled irrigation was applied to a field plot and the soil moisture content potential and outflow from a drain at the base of the plot were monitored. Intensities ranged between 3.6 and 15.6 mm h −1. Moisture content and potential were also monitored at two undrained sites over a period of three-and-a-half yrs. The observations made during these investigations demonstrated that macropore channels played an important role in the hydrology of this soil.
Published Version
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