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Radial-Flow Cell for Soil-Water Measurements¹

ABSTRACT

A cylindrical ceramic cup, centrally placed in a cylindrical core sample of soil has several advantages over the conventional arrangement of a plane suction control surface at one end of a soil column. Flow disturbance arising from change of contact with the cup membrane when the sample shrinks is minimized and gaseous diffusion through the membrane is less troublesome for the evlindrical case. Ceramic cups usable to 15 bar are available. A drop counter is used for recording outflow and approach to equilibrium. The solution of the radial-flow equation is given for the appropriate boundary conditions. The radial-flow cell is useful for measuring retentivity, specific capacity, diffusivity, and conductivity of water in a core sample of soil having quasi-undisturbed structure.

¹ Contribution from the U. S. Salinity Laboratory, Soil and Water Conservation Research Division, ARS, USDA, and the Bell Telephone Laboratories, Inc., Murray Hill, N. J. Effective assistance with the experimental work was given by F. N. Dalton; the project was supported in part by the U. S. Army Electronics Proving Ground, Fort Huachuca, Ariz. Presented before Div. I, Soil Science Society of America, Nov. 27, 1961, at St. Louis, Mo.

² Physicists, U. S. Salinity Laboratory, Riverside, Calif., and Bell Telephone Laboratories, Inc., Murray Hill, N. J. respectively.

Received for publication January 31, 1962. Accepted for publication February 8, 1962.