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Soil Water Diffusivity and Hysteresis Data from Radial Flow Pressure Cells¹

ABSTRACT

The theory and advantages of radial flow geometry for the determination of soil water diffusivity are discussed. A description is given of a cylindrical pressure cell in which this theory is applied. Values of the soil water diffusivity, D, were obtained from a comparison of the experimental volume outflow or inflow-time curves with the theoretical relationship between volume outflow or inflow and the factor Dt where t is time. Diffusivities were measured in the pressure range up to 1 atmospheres on two porous media. The diffusivity-water content hysteresis function was observed to be composed of crossed-curve segments forming a skewed and distorted "bowtie."

¹ Joint contribution of the Illinois Agr. Exp. Sta., Urbana, Ill., and the Soil and Water Conservation Research Division, ARS, USDA. The work described herein was in part supported by a National Science Foundation grant.

² Professor of Soil Physics, University of Illinois; Soil Scientist, ARS; and Associate Professor of Mathematics, University of Illinois, and Mathematician, ARS; respectively.

Received for publication July 22, 1963. Accepted for publication October 28, 1963.