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Dynamic Determination of Capillary Conductivity Extended for Non-Negligible Membrane Impedance¹

ABSTRACT

W. R. Gardner's recent method for determining capillary conductivity from the transient outflow of a slab following a small step-change of pressure has been extended to cases in which the impedance of the supporting membrane or porous plate must be taken into account. From this theoretical result a practical method is developed employing all of the experimental data (not just the exponential tail) for determining K values accurate within the inherent limits of the data.

¹ Contribution from the Departments of Soils and Physics, University of Wisconsin, Madison. Presented before Div. I, Soil Science Society of America, Atlanta, Ga., Nov. 21, 1957.

² Associate Professor of Physics and Soils, and formerly Graduate Assistant, respectively. The latter is now assistant professor, Department of Physics, Ontario Agricultural College, Guelph, Ontario, Can.

Received for publication May 1, 1958. Accepted for publication June 23, 1958.