Abstract
SummaryIt is shown on theoretical grounds that the shape of the moisture profile about a moving water table depends upon both the rate of infiltration at the soil surface and the rate of rise or fall of the water table. The profile shape may be computed provided that the moisture characteristic and the dependence of the hydraulic conductivity of the material on moisture content are known, and also provided that if the water table should be falling its velocity should not exceed the value of dK/dc at the moisture content Cu, prevailing at the surface of infiltration, where the hydraulic conductivity, Ku is equal to the infiltration rate. Experiments are described and the results are presented to show agreement between observed and computed profiles when the limiting condition is satisfied, for various combinations of rate of infiltration and rate of fall of the water table. Even when the limitation is not satisfied fair agreement is found over much of the range of moisture content, the discrepancy where it occurs being in the expected sense.
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