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Hydraulic Conductivity of Clays During Shrinkage¹

ABSTRACT

The ratio of unsaturated to saturated hydraulic conductivity was determined for mixtures of glass beads and clay, and for a clay soil. In shrinking soils, the relative hydraulic conductivity remained fairly high over a wide range of mositure contents, while in nonshrinking soils the relative hydraulic conductivity rapidly approached zero with decreasing moisture content.

¹ Contribution from the Department of Soil Science, Macdonald College of McGill University, Quebec, Canada. Based in part on a thesis submitted for the Ph.D. degree. The author wishes to acknowledge the assistance of Dr. B. P. Warkentin under whose direction this work was carried out, and the Canada Department of Agriculture for their Extra Mural Research Grant.

Received for publication August 24, 1965. Accepted for publication February 7, 1966.