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Experimental Consideration of Diffusion Analysis in Unsaturated Flow Problems¹

ABSTRACT

An experimental investigation of the applicability of the diffusion equation to soil water movement is reported using soils and sandstone with water and oil. The fluids were allowed to enter at different negative pressures into air-dry horizontal columns of several lengths. The equation predicted the water movement when the entry pressure was –2 millibars. The inability of the equation to predict water movement for greater negative pressures is discussed.

¹ Contribution from the Department of Irrigation, University of California, Davis. The research was supported in part by funds from Contract No. Da-36-039-SC-80334 for the U. S. Army Electronic Proving Ground, Ft. Huachuca, Ariz.

² Assistant Professor, Assistant Irrigationist, and Laboratory Technician II, respectively, University of California, Davis.

Received for publication April 21, 1961. Accepted for publication May 29, 1961.