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Controlled Instantaneous Application of Free Water to a Porous Surface¹

ABSTRACT

Instantaneous application of free water to a porous-medium surface is achieved essentially by a device in which the central feature is a plastic plate perforated with small holes. The pressure head of the water can be controlled at a preselected value between 0 and 1 cm. Water enters the porous mdium at essentially zero external flow resistance, while volume and time of entry can be measured accurately. No lateral flow of free water occurs, thus eliminating the disturbing effects of such flow on the porous-medium surface.

¹ Contribution from the Dep. of Agronomy as Journal Paper no. 5094, Purdue Univ. Agr. Exp. Sta., West Lafayette, Indiana 47907. Partial support was from funds provided by the US Dep. of the Interior, Office of Water Resour. Res., as authorized under the Water Resources Research Act of 1964.

² Professor of Soils and Postdoctoral Research Associate, respectively. Second author is now Associate Professor of Soils, University of Libya, Tripoli.

Received for publication April 16, 1973. Accepted for publication May 9, 1973.