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Drainage Characteristics of Soils¹

ABSTRACT

Evidence was obtained indicating that neither water conductivity nor water content are single-valued functions of soil water suction during a period in which soil is draining continuously. Functional relationships between water conductivity and soil water suction measured during continuous drainage were found to be different from those frequently observed during steady-state experiments. During drainage, a finite suction is recorded before a soil begins to desaturate and this suction is often larger than the suction existing immediately after drainage starts. It is postulated that the reduction in suction is a result of air reaching larger (previously isolated) pores.

¹ A major portion of this research was supported by the Swiss Federal Institute of Technology (ETH) through a grant obtained with the help of Professor Th. Dracos, Director of the Institute of Water Management Research, Tannenstrasse 1, Zurich, Switzerland.

² Professor of Agricultural Engineering, Colorado State Univ., Ft. Collins, 80521, and Professor of Agricultural Engineering, Oregon State Univ., Corvallis, respectively.

Received for publication April 18, 1974. Accepted for publication November 21, 1974.