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Comparison of Water Content-Pressure Head Data Obtained by Equilibrium, Steady-State, and Unsteady-State Methods¹

ABSTRACT

The water content-pressure head relationship for a small, well-confined, rectangular sample of fine sand was obtained under different water flow conditions. Water contents were measured by a gamma system and pressure heads were measured by a tensiometer-pressure transducer combination. During drying, more water was retained in the sand at a given pressure head in the unsteady flow case than in the static equilibrium and steady-state cases, which agreed with each other.

¹ This research was supported by grant number G18897 of the National Science Foundation.

² Research Associate, Professor of Soil Physics, Univ. of Illinois, and Soil Scientist, Soil and Water Conserv. Res. Div., USDA, respectively. The senior author's present position is with the Soil Research Institute, Canada Dep. of Agr., Ottawa. The assistance given by Mr. Ralph Sedgley in the collection of data is gratefully recognized.

Received for publication October 10, 1966. Accepted for publication January 4, 1967.