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Determining the Hydraulic Conductivity of Soil Cores by Centrifugation¹

ABSTRACT

Two centrifugal techniques are proposed for determining the hydraulic conductivity of cores of natural soil. Experimental results are presented for one technique in which the change in weight of one end of the sample, previously centrifuged, is measured with a balance. The mathematical equations describing this redistribution process were developed and fitted to the data to ascertain the soil water diffusivity D. The value of the hydraulic conductivity K was obtained from K = bD, where b is also calculated. Calculated values of K agreed with previously published values. The second technique for which a theory is presented but no experimental values are provided depends upon the measurement of the volumetric outflow of water from a soil core when the speed of centrifugation is suddenly increased.

¹ Presented at the annual meeting of the Soil Science Society of America, Chicago, Ill., 11 Nov. 1974. Contribution from the Dep. of Land, Air & Water Resources, Univ. of California, Davis, CA 95616.

² Postgraduate Research Water Scientist and Professors of Water Science, respectively.

Received for publication July 16, 1975. Accepted for publication November 4, 1975.